matplotlib-users Mailing List for matplotlib (Page 10)

On 1/11/2012 7:37 AM, Vítor Carvalho wrote:
> Hi,
>
> Someone can help me to configure the python to create uma image graph
> with the matplotlib or can sugest other way to create one graph  in
> this version of python?
>
> I need use the Python 2.5.*
> I instaled the Python 2.5.4, the "numpy-1.3.0.win32-py2.5", the
> "matplotlib-1.1.0.win32-py2.5" and the "basemap-1.0.2.win32-py2.5".
>
>
> ####### This is the code that I try to run #########################
>
> #set up matplotlib and the figure
> import matplotlib.pyplot as plt
> plt.figure
>
> #create data
> x_series = [0,1,2,3,4,5]
> y_series_1 = [x**2 for x in x_series]
> y_series_2 = [x**3 for x in x_series]
>
> #plot data
> plt.plot(x_series, y_series_1, label="x^2")
> plt.plot(x_series, y_series_2, label="x^3")
>
> #add in labels and title
> plt.xlabel("Small X Interval")
> plt.ylabel("Calculated Data")
> plt.title("Our Fantastic Graph")
>
> #add limits to the x and y axis
> plt.xlim(0, 6)
> plt.ylim(-5, 80)
>
> #create legend
> plt.legend(loc="upper left")
>
> #save figure to png
> plt.savefig("example.png")
>
>
> ####### The error that I received ##########################
>
> Python 2.5.4 (r254:67916, Dec 23 2008, 15:10:54) [MSC v.1310 32 bit
> (Intel)] on win32
> Type "copyright", "credits" or "license()" for more information.
>
>      ****************************************************************
>      Personal firewall software may warn about the connection IDLE
>      makes to its subprocess using this computer's internal loopback
>      interface.  This connection is not visible on any external
>      interface and no data is sent to or received from the Internet.
>      ****************************************************************
>
> IDLE 1.2.4      ==== No Subprocess ====
>>>>
> Traceback (most recent call last):
>    File "C:\Projeto\Scripts\teste.py", line 2, in<module>
>      import matplotlib.pyplot as plt
>    File "C:\Python25\lib\site-packages\matplotlib\pyplot.py", line 23,
> in<module>
>      from matplotlib.figure import Figure, figaspect
>    File "C:\Python25\lib\site-packages\matplotlib\figure.py", line 16,
> in<module>
>      import artist
>    File "C:\Python25\lib\site-packages\matplotlib\artist.py", line 6, in<module>
>      from transforms import Bbox, IdentityTransform, TransformedBbox,
> TransformedPath
>    File "C:\Python25\lib\site-packages\matplotlib\transforms.py", line
> 34, in<module>
>      from matplotlib._path import affine_transform
> ImportError: DLL load failed: The specified module could not be found.
>>>>
>
>
>
>
>
> Best regards,
> Vítor Carvalho
>

The C++ runtime library msvcp71.dll is probably missing on your system. 
Try install "vc71crt-3052.4.win32-py2.5.‌exe" from 
<http://www.lfd.uci.edu/~gohlke/pythonlibs/#vc.crt>.

Christoph

Hi,

you can create such clouds here -> http://www.wordle.net/
or have a look at the wordle script created by this guy:
http://www.loria.fr/~rougier/coding/misc.html

Both are not related to matplotlib, but the results are very good!

br
Jakob

On 01/11/2012 05:19 PM, Reckoner wrote:
> I've looked through the gallery, but I haven't found an example of a tag cloud.
>
> Can one be built using matplotlib? For clarity, something like this is
> what I'm referring to:
>
> http://upload.wikimedia.org/wikipedia/en/thumb/a/a5/TagCloudCloud.png/800px-TagCloudCloud.png
>
> Thanks!
>
> ------------------------------------------------------------------------------
> Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex
> infrastructure or vast IT resources to deliver seamless, secure access to
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> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users

I've looked through the gallery, but I haven't found an example of a tag cloud.

Can one be built using matplotlib? For clarity, something like this is
what I'm referring to:

http://upload.wikimedia.org/wikipedia/en/thumb/a/a5/TagCloudCloud.png/800px-TagCloudCloud.png

Thanks!

When I try to turn on the grid for just one axis, seemingly in perfect accordance with the documentation at 
http://matplotlib.sourceforge.net/api/axes_api.html#matplotlib.axes.Axes.grid

it seems like there is a problem.  I am able to make a graph, but trying to turn on the grid for just one axis causes an error.

My commands are pasted below.

Am I doing this wrong?  I am doing the best I can to follow the documentation exactly.

Thanks for any help!


import matplotlib
matplotlib.use('MacOSX')
import matplotlib.pyplot as plt
fig=plt.figure()
ax=fig.add_subplot(111)
ax.plot([1,2,3])
ax.set_xlabel('Hi there')
ax.grid(True, axis='x')


bombayduck:~$ python
Python 2.6.5 (r265:79359, Mar 24 2010, 01:32:55) 
[GCC 4.0.1 (Apple Inc. build 5493)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import matplotlib
>>> matplotlib.use('MacOSX')
>>> import matplotlib.pyplot as plt
>>> fig=plt.figure()
>>> ax=fig.add_subplot(111)
>>> ax.plot([1,2,3])
[<matplotlib.lines.Line2D object at 0x1a27e30>]
>>> ax.set_xlabel('Hi there')
<matplotlib.text.Text object at 0x1a58030>
>>> ax.grid(True, axis='x')
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/axes.py", line 1823, in grid
   self.xaxis.grid(b, **kwargs)
 File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/axis.py", line 965, in grid
   if len(kwargs): artist.setp(tick.gridline,**kwargs)
 File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/artist.py", line 1169, in setp
   func = getattr(o,funcName)
AttributeError: 'Line2D' object has no attribute 'set_axis'

-dave----------------------------------------------------------------------
A neuroscientist is at the video arcade, when someone makes him a $1000 bet
on Pac-Man. He smiles, gets out his screwdriver and takes apart the Pac-Man
game. Everyone says "What are you doing?" The neuroscientist says "Well,
since we all know that Pac-Man is based on electric signals traveling
through these circuits, obviously I can understand it better than the other
guy by going straight to the source!"

Hi,

Someone can help me to configure the python to create uma image graph
with the matplotlib or can sugest other way to create one graph  in
this version of python?

I need use the Python 2.5.*
I instaled the Python 2.5.4, the "numpy-1.3.0.win32-py2.5", the
"matplotlib-1.1.0.win32-py2.5" and the "basemap-1.0.2.win32-py2.5".


####### This is the code that I try to run #########################

#set up matplotlib and the figure
import matplotlib.pyplot as plt
plt.figure

#create data
x_series = [0,1,2,3,4,5]
y_series_1 = [x**2 for x in x_series]
y_series_2 = [x**3 for x in x_series]

#plot data
plt.plot(x_series, y_series_1, label="x^2")
plt.plot(x_series, y_series_2, label="x^3")

#add in labels and title
plt.xlabel("Small X Interval")
plt.ylabel("Calculated Data")
plt.title("Our Fantastic Graph")

#add limits to the x and y axis
plt.xlim(0, 6)
plt.ylim(-5, 80)

#create legend
plt.legend(loc="upper left")

#save figure to png
plt.savefig("example.png")


####### The error that I received ##########################

Python 2.5.4 (r254:67916, Dec 23 2008, 15:10:54) [MSC v.1310 32 bit
(Intel)] on win32
Type "copyright", "credits" or "license()" for more information.

    ****************************************************************
    Personal firewall software may warn about the connection IDLE
    makes to its subprocess using this computer's internal loopback
    interface.  This connection is not visible on any external
    interface and no data is sent to or received from the Internet.
    ****************************************************************

IDLE 1.2.4      ==== No Subprocess ====
>>>
Traceback (most recent call last):
  File "C:\Projeto\Scripts\teste.py", line 2, in <module>
    import matplotlib.pyplot as plt
  File "C:\Python25\lib\site-packages\matplotlib\pyplot.py", line 23,
in <module>
    from matplotlib.figure import Figure, figaspect
  File "C:\Python25\lib\site-packages\matplotlib\figure.py", line 16,
in <module>
    import artist
  File "C:\Python25\lib\site-packages\matplotlib\artist.py", line 6, in <module>
    from transforms import Bbox, IdentityTransform, TransformedBbox,
TransformedPath
  File "C:\Python25\lib\site-packages\matplotlib\transforms.py", line
34, in <module>
    from matplotlib._path import affine_transform
ImportError: DLL load failed: The specified module could not be found.
>>>





Best regards,
Vítor Carvalho

Hi all.
Can I set a figure to appear on my screen in the same way as it is saved
in png file?
Thanks.
-- 
Petro 

On 11 January 2012 15:13, Petro <x....@gm...> wrote:
> I want to make a plot with two xticks. Lets say at -3051 and 2011
> position. How can I do it?

One way to do it:

import numpy as np
import matplotlib.pyplot as plt

x = np.linspace(-3100, 2025, num=50)
y = np.random.random(50)

plt.plot(x, y)
plt.xticks([-3051, 2011])
plt.show()

Cheers,
Scott

Hi all.
I want to make a plot with two xticks. Lets say at -3051 and 2011
position. How can I do it?
Thanks.
Petro.
 

Matplotlib 1.1.0 on Ubuntu 11.04

If MPL backand is set to TkAgg, drawing window dialog appears without plot
content, and then after closing it, this error is thrown:

========================================
Exception in Tkinter callback
Traceback (most recent call last):
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1413, in __call__
    return self.func(*args)
  File
"/usr/local/lib/python2.7/dist-packages/matplotlib/backends/backend_tkagg.py",
line 236, in resize
    self.show()
  File
"/usr/local/lib/python2.7/dist-packages/matplotlib/backends/backend_tkagg.py",
line 240, in draw
    tkagg.blit(self._tkphoto, self.renderer._renderer, colormode=2)
  File
"/usr/local/lib/python2.7/dist-packages/matplotlib/backends/tkagg.py", line
19, in blit
    tk.call("PyAggImagePhoto", photoimage, id(aggimage), colormode,
id(bbox_array))
TclError
========================================

Is this known, or maybe something is wrong at my side?

Thanks for the report, Ethan,

Ethan Swint, on 2012-01-10 16:34,  wrote:
> Can anyone else reproduce?

Confirming, this is a bug. We need to change the matplotlib code,
but I'm not sure how to proceed. I've filed it as the ominously
numbered matplotlib issue #666

https://github.com/matplotlib/matplotlib/issues/666

> It seems that 'xi,yi = np.meshgrid(xi,yi)' from line 2766 of mlab.py 
> doesn't always produce uniformly spaced data, as the test for uniform 
> data fails at line 2779.  Ignoring the error, however, results in 
> satisfactory evaluation of interp() on 2783.

That's not quite the issue here, as meshgrid simply reshapes and
repeats the data that you hand it. 

At first I was going to blame linspace, because a similar issue
came up on this list late last year, and in that example, simply
using arange instead of linspace resolved the issue:

http://old.nabble.com/constant-spacing-with-griddata-td33007330.html#a33007330

There, I considered the possibility that either (or both) the
numpy and mpl code should be changed. 

With your example, I'm convinced now the MPL code needs to
change, since here, linspace and arange produce identical
results. The reason I'm not sure how to proceed is that the
difference between dx.max() and dx.min() can be an order of
magnitude greater than the epsx value it is compared against.
Here's a modification to your example that does this

  In [155]: xi = np.linspace(0,603,100);dx =np.diff(xi); dx.ptp()
  Out[155]: 0.00000000000011368684
  
  In [157]: zi = griddata(x,y,z,xi,yi,interp='linear')
  --error--
  In [158]: debug
  > /home/pi/usr/local/lib/python2.6/site-packages/matplotlib/mlab.py(2780)griddata()
     2779             if dx.max()-dx.min() > epsx or
  dy.max()-dy.min() > epsy:
  -> 2780                 raise ValueError("output grid must have
  constant spacing"
     2781                                  " when using
  interp='linear'")
  
  ipdb> dx.ptp()
  1.1368683772161603e-13
  ipdb> epsx
  1.0000000000000001e-15
  ipdb> 

I believe that this has to do with the limited precision and
non-uniformity of the possible numbers represented by the
floating point standard. The check for constant spacing likely
should take into account and compare dx.ptp() to the average dx
itself, or something like that.

best,
-- 
Paul Ivanov
314 address only used for lists,  off-list direct email at:
http://pirsquared.org | GPG/PGP key id: 0x0F3E28F7 

Hi-

I was working off of the example listed at 
http://matplotlib.sourceforge.net/examples/pylab_examples/griddata_demo.html, 
adapting it to my own data, and encountered the following error on MLAB 
1.1.0, Python 2.7.2:
<code>

from numpy.random import uniform, seed
from matplotlib.mlab import griddata
import matplotlib.pyplot as plt
import numpy as np
# make up data.
#npts = int(raw_input('enter # of random points to plot:'))
seed(0)
npts = 200
x = uniform(-2,2,npts)
y = uniform(-2,2,npts)
z = x*np.exp(-x**2-y**2)
xi = np.linspace(0,60,100)  # <= my xdata range
yi = np.linspace(0,0.9,200) # <= my ydata range
zi = griddata(x,y,z,xi,yi,interp='linear')

</code>

which produces 
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
C:\Users\Ethan\code\PythonScripts\<ipython-input-7-51e10e494403> in 
<module>()
----> 1 zi = griddata(x,y,z,xi,yi,interp='linear')

It seems that 'xi,yi = np.meshgrid(xi,yi)' from line 2766 of mlab.py 
doesn't always produce uniformly spaced data, as the test for uniform 
data fails at line 2779.  Ignoring the error, however, results in 
satisfactory evaluation of interp() on 2783.

Can anyone else reproduce?

Regards,
Ethan

I am still seeing the error below in matplotlib-1.1.0 - the bug occurs
when the user installs our software to the directory "version1", uses
that installation, then installs "version2" and removes "version1",
which breaks matplotlib because (unlike any other Python module I've
ever used) the absolute font paths are hardwired into the user's local
configuration.  I was told nearly a year ago that this was already
fixed in SVN, but clearly this is not the case.  Is there a workaround
for this other than emailing every user who complains and telling
him/her to rm -rf ~/.matplotlib?

thanks,
Nat

 File "/Users/nat/version2/Python.framework/Versions/Current/lib/python2.7/site-packages/matplotlib/backends/backend_wxagg.py",
line 59, in draw
   FigureCanvasAgg.draw(self)
 File "/Users/nat/version2/Python.framework/Versions/Current/lib/python2.7/site-packages/matplotlib/backends/backend_agg.py",
line 401, in draw
   self.figure.draw(self.renderer)
 File "/Users/nat/version2/Python.framework/Versions/Current/lib/python2.7/site-packages/matplotlib/artist.py",
line 55, in draw_wrapper
   draw(artist, renderer, *args, **kwargs)
 File "/Users/nat/version2/Python.framework/Versions/Current/lib/python2.7/site-packages/matplotlib/figure.py",
line 884, in draw
   func(*args)
 File "/Users/nat/version2/Python.framework/Versions/Current/lib/python2.7/site-packages/matplotlib/artist.py",
line 55, in draw_wrapper
   draw(artist, renderer, *args, **kwargs)
 File "/Users/nat/version2/Python.framework/Versions/Current/lib/python2.7/site-packages/matplotlib/axes.py",
line 1983, in draw
   a.draw(renderer)
 File "/Users/nat/version2/Python.framework/Versions/Current/lib/python2.7/site-packages/matplotlib/artist.py",
line 55, in draw_wrapper
   draw(artist, renderer, *args, **kwargs)
 File "/Users/nat/version2/Python.framework/Versions/Current/lib/python2.7/site-packages/matplotlib/axis.py",
line 1037, in draw
   ticklabelBoxes, ticklabelBoxes2 =
self._get_tick_bboxes(ticks_to_draw, renderer)
 File "/Users/nat/version2/Python.framework/Versions/Current/lib/python2.7/site-packages/matplotlib/axis.py",
line 988, in _get_tick_bboxes
   extent = tick.label1.get_window_extent(renderer)
 File "/Users/nat/version2/Python.framework/Versions/Current/lib/python2.7/site-packages/matplotlib/text.py",
line 747, in get_window_extent
   bbox, info = self._get_layout(self._renderer)
 File "/Users/nat/version2/Python.framework/Versions/Current/lib/python2.7/site-packages/matplotlib/text.py",
line 300, in _get_layout
   ismath=False)
 File "/Users/nat/version2/Python.framework/Versions/Current/lib/python2.7/site-packages/matplotlib/backends/backend_agg.py",
line 183, in get_text_width_height_descent    font =
self._get_agg_font(prop)
 File "/Users/nat/version2/Python.framework/Versions/Current/lib/python2.7/site-packages/matplotlib/backends/backend_agg.py",
line 224, in _get_agg_font   font = FT2Font(str(fname))
RuntimeError: Could not open facefile
/Users/nat/version1/Python.framework/Versions/Current/lib/python2.7/site-packages/matplotlib/mpl-data/fonts/ttf/VeraMono.ttf;
Cannot_Open_Resource

Regardless of exactly which polynomial you are after, I've showed you how
to plot a cheb. poly.  Can you not work with the code given and plot the
exact variation of polynomial you want?



On Tue, Jan 10, 2012 at 9:46 AM, Fabien Lafont <laf...@gm...>wrote:

> No I just want to plot the third Shebitchev polynomial.
>
> 2012/1/10 Daniel Hyams <dh...@gm...>:
> > I think that you're misusing Chebyshev (do you really only want to give
> "3"
> > as a coefficient..which is just the constant function 3), and you have to
> > evaluate it in order to give matplotlib some x and y data to plot.
> >
> > from matplotlib import pyplot as plt
> > import numpy as np
> >
> > x = np.linspace(-1.0,1.0)
> > test = np.polynomial.Chebyshev((1,2,3))
> > y = test(x)
> > plt.plot(x,y)
> > plt.show()
> >
> >
> >
> > On Tue, Jan 10, 2012 at 9:10 AM, Fabien Lafont <laf...@gm...>
> > wrote:
> >>
> >> I'm trying to plot Chebyshev polynolmials using:
> >> numpy.polynomial.Chebyshev:
> >>
> >>
> >> import math
> >> from numpy import *
> >> from numpy import polynomial as pol
> >> from pylab import *
> >> from scipy import *
> >> from scipy import optimize
> >> import warnings
> >> warnings.simplefilter('ignore', np.RankWarning)
> >>
> >>
> >> test = pol.Chebyshev(3)
> >> print test
> >> plot (test)
> >>
> >>
> >> show()
> >> =======================================================================
> >>
> >> The print return:      cheb([ 3.])
> >>
> >> =======================================================================
> >> and plot :
> >>
> >>
> >> Traceback (most recent call last):
> >>  File "T:\Dropbox\Thèse\Python\fit sonde\test_poly_Tcheb.py", line
> >> 32, in <module>
> >>    plot (test)
> >>  File "C:\Python27\lib\site-packages\matplotlib\pyplot.py", line 2458,
> in
> >> plot
> >>    ret = ax.plot(*args, **kwargs)
> >>  File "C:\Python27\lib\site-packages\matplotlib\axes.py", line 3849, in
> >> plot
> >>    self.add_line(line)
> >>  File "C:\Python27\lib\site-packages\matplotlib\axes.py", line 1443,
> >> in add_line
> >>    self._update_line_limits(line)
> >>  File "C:\Python27\lib\site-packages\matplotlib\axes.py", line 1451,
> >> in _update_line_limits
> >>    p = line.get_path()
> >>  File "C:\Python27\lib\site-packages\matplotlib\lines.py", line 644,
> >> in get_path
> >>    self.recache()
> >>  File "C:\Python27\lib\site-packages\matplotlib\lines.py", line 401, in
> >> recache
> >>    y = np.asarray(yconv, np.float_)
> >>  File "C:\Python27\lib\site-packages\numpy\core\numeric.py", line
> >> 235, in asarray
> >>    return array(a, dtype, copy=False, order=order)
> >> TypeError: float() argument must be a string or a number
> >>
> >>
> >>
> ------------------------------------------------------------------------------
> >> Write once. Port to many.
> >> Get the SDK and tools to simplify cross-platform app development. Create
> >> new or port existing apps to sell to consumers worldwide. Explore the
> >> Intel AppUpSM program developer opportunity.
> appdeveloper.intel.com/join
> >> http://p.sf.net/sfu/intel-appdev
> >> _______________________________________________
> >> Matplotlib-users mailing list
> >> Mat...@li...
> >> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
> >
> >
> >
> >
> > --
> > Daniel Hyams
> > dh...@gm...
> >
> >
> ------------------------------------------------------------------------------
> > Write once. Port to many.
> > Get the SDK and tools to simplify cross-platform app development. Create
> > new or port existing apps to sell to consumers worldwide. Explore the
> > Intel AppUpSM program developer opportunity. appdeveloper.intel.com/join
> > http://p.sf.net/sfu/intel-appdev
> > _______________________________________________
> > Matplotlib-users mailing list
> > Mat...@li...
> > https://lists.sourceforge.net/lists/listinfo/matplotlib-users
> >
>



-- 
Daniel Hyams
dh...@gm...

I'm not used to reply-all


---------- Forwarded message ----------
From:  <jos...@gm...>
Date: Tue, Jan 10, 2012 at 10:20 AM
Subject: Re: [Matplotlib-users] How to plot Chebyshev polynolmials
To: Fabien Lafont <laf...@gm...>


On Tue, Jan 10, 2012 at 9:46 AM, Fabien Lafont <laf...@gm...> wrote:
> No I just want to plot the third Shebitchev polynomial.

the vander functions give you the basis functions for a given x, or
use coefficients only for the polynomial you want, if I understand
correctly what you want

>>> import numpy as np
>>> from numpy import polynomial as poly
>>> chebs = [poly.Chebyshev(coef) for coef in np.eye(5)]
>>> for p in chebs: plt.plot(x, p(x))
...
[<matplotlib.lines.Line2D object at 0x046D91F0>]
[<matplotlib.lines.Line2D object at 0x046D9510>]
[<matplotlib.lines.Line2D object at 0x046D9830>]
[<matplotlib.lines.Line2D object at 0x046D9B50>]
[<matplotlib.lines.Line2D object at 0x046D9E70>]
>>> plt.show()

or
>>> plt.plot(poly.chebvander(x, 5))

Josef



>
> 2012/1/10 Daniel Hyams <dh...@gm...>:
>> I think that you're misusing Chebyshev (do you really only want to give "3"
>> as a coefficient..which is just the constant function 3), and you have to
>> evaluate it in order to give matplotlib some x and y data to plot.
>>
>> from matplotlib import pyplot as plt
>> import numpy as np
>>
>> x = np.linspace(-1.0,1.0)
>> test = np.polynomial.Chebyshev((1,2,3))
>> y = test(x)
>> plt.plot(x,y)
>> plt.show()
>>
>>
>>
>> On Tue, Jan 10, 2012 at 9:10 AM, Fabien Lafont <laf...@gm...>
>> wrote:
>>>
>>> I'm trying to plot Chebyshev polynolmials using:
>>> numpy.polynomial.Chebyshev:
>>>
>>>
>>> import math
>>> from numpy import *
>>> from numpy import polynomial as pol
>>> from pylab import *
>>> from scipy import *
>>> from scipy import optimize
>>> import warnings
>>> warnings.simplefilter('ignore', np.RankWarning)
>>>
>>>
>>> test = pol.Chebyshev(3)
>>> print test
>>> plot (test)
>>>
>>>
>>> show()
>>> =======================================================================
>>>
>>> The print return:      cheb([ 3.])
>>>
>>> =======================================================================
>>> and plot :
>>>
>>>
>>> Traceback (most recent call last):
>>>  File "T:\Dropbox\Thèse\Python\fit sonde\test_poly_Tcheb.py", line
>>> 32, in <module>
>>>    plot (test)
>>>  File "C:\Python27\lib\site-packages\matplotlib\pyplot.py", line 2458, in
>>> plot
>>>    ret = ax.plot(*args, **kwargs)
>>>  File "C:\Python27\lib\site-packages\matplotlib\axes.py", line 3849, in
>>> plot
>>>    self.add_line(line)
>>>  File "C:\Python27\lib\site-packages\matplotlib\axes.py", line 1443,
>>> in add_line
>>>    self._update_line_limits(line)
>>>  File "C:\Python27\lib\site-packages\matplotlib\axes.py", line 1451,
>>> in _update_line_limits
>>>    p = line.get_path()
>>>  File "C:\Python27\lib\site-packages\matplotlib\lines.py", line 644,
>>> in get_path
>>>    self.recache()
>>>  File "C:\Python27\lib\site-packages\matplotlib\lines.py", line 401, in
>>> recache
>>>    y = np.asarray(yconv, np.float_)
>>>  File "C:\Python27\lib\site-packages\numpy\core\numeric.py", line
>>> 235, in asarray
>>>    return array(a, dtype, copy=False, order=order)
>>> TypeError: float() argument must be a string or a number
>>>
>>>
>>> ------------------------------------------------------------------------------
>>> Write once. Port to many.
>>> Get the SDK and tools to simplify cross-platform app development. Create
>>> new or port existing apps to sell to consumers worldwide. Explore the
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>>> _______________________________________________
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>>> Mat...@li...
>>> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>>
>>
>>
>>
>> --
>> Daniel Hyams
>> dh...@gm...
>>
>> ------------------------------------------------------------------------------
>> Write once. Port to many.
>> Get the SDK and tools to simplify cross-platform app development. Create
>> new or port existing apps to sell to consumers worldwide. Explore the
>> Intel AppUpSM program developer opportunity. appdeveloper.intel.com/join
>> http://p.sf.net/sfu/intel-appdev
>> _______________________________________________
>> Matplotlib-users mailing list
>> Mat...@li...
>> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>>
>
> ------------------------------------------------------------------------------
> Write once. Port to many.
> Get the SDK and tools to simplify cross-platform app development. Create
> new or port existing apps to sell to consumers worldwide. Explore the
> Intel AppUpSM program developer opportunity. appdeveloper.intel.com/join
> http://p.sf.net/sfu/intel-appdev
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users

No I just want to plot the third Shebitchev polynomial.

2012/1/10 Daniel Hyams <dh...@gm...>:
> I think that you're misusing Chebyshev (do you really only want to give "3"
> as a coefficient..which is just the constant function 3), and you have to
> evaluate it in order to give matplotlib some x and y data to plot.
>
> from matplotlib import pyplot as plt
> import numpy as np
>
> x = np.linspace(-1.0,1.0)
> test = np.polynomial.Chebyshev((1,2,3))
> y = test(x)
> plt.plot(x,y)
> plt.show()
>
>
>
> On Tue, Jan 10, 2012 at 9:10 AM, Fabien Lafont <laf...@gm...>
> wrote:
>>
>> I'm trying to plot Chebyshev polynolmials using:
>> numpy.polynomial.Chebyshev:
>>
>>
>> import math
>> from numpy import *
>> from numpy import polynomial as pol
>> from pylab import *
>> from scipy import *
>> from scipy import optimize
>> import warnings
>> warnings.simplefilter('ignore', np.RankWarning)
>>
>>
>> test = pol.Chebyshev(3)
>> print test
>> plot (test)
>>
>>
>> show()
>> =======================================================================
>>
>> The print return:      cheb([ 3.])
>>
>> =======================================================================
>> and plot :
>>
>>
>> Traceback (most recent call last):
>>  File "T:\Dropbox\Thèse\Python\fit sonde\test_poly_Tcheb.py", line
>> 32, in <module>
>>    plot (test)
>>  File "C:\Python27\lib\site-packages\matplotlib\pyplot.py", line 2458, in
>> plot
>>    ret = ax.plot(*args, **kwargs)
>>  File "C:\Python27\lib\site-packages\matplotlib\axes.py", line 3849, in
>> plot
>>    self.add_line(line)
>>  File "C:\Python27\lib\site-packages\matplotlib\axes.py", line 1443,
>> in add_line
>>    self._update_line_limits(line)
>>  File "C:\Python27\lib\site-packages\matplotlib\axes.py", line 1451,
>> in _update_line_limits
>>    p = line.get_path()
>>  File "C:\Python27\lib\site-packages\matplotlib\lines.py", line 644,
>> in get_path
>>    self.recache()
>>  File "C:\Python27\lib\site-packages\matplotlib\lines.py", line 401, in
>> recache
>>    y = np.asarray(yconv, np.float_)
>>  File "C:\Python27\lib\site-packages\numpy\core\numeric.py", line
>> 235, in asarray
>>    return array(a, dtype, copy=False, order=order)
>> TypeError: float() argument must be a string or a number
>>
>>
>> ------------------------------------------------------------------------------
>> Write once. Port to many.
>> Get the SDK and tools to simplify cross-platform app development. Create
>> new or port existing apps to sell to consumers worldwide. Explore the
>> Intel AppUpSM program developer opportunity. appdeveloper.intel.com/join
>> http://p.sf.net/sfu/intel-appdev
>> _______________________________________________
>> Matplotlib-users mailing list
>> Mat...@li...
>> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
>
>
>
> --
> Daniel Hyams
> dh...@gm...
>
> ------------------------------------------------------------------------------
> Write once. Port to many.
> Get the SDK and tools to simplify cross-platform app development. Create
> new or port existing apps to sell to consumers worldwide. Explore the
> Intel AppUpSM program developer opportunity. appdeveloper.intel.com/join
> http://p.sf.net/sfu/intel-appdev
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>

I think that you're misusing Chebyshev (do you really only want to give "3"
as a coefficient..which is just the constant function 3), and you have to
evaluate it in order to give matplotlib some x and y data to plot.

from matplotlib import pyplot as plt
import numpy as np

x = np.linspace(-1.0,1.0)
test = np.polynomial.Chebyshev((1,2,3))
y = test(x)
plt.plot(x,y)
plt.show()



On Tue, Jan 10, 2012 at 9:10 AM, Fabien Lafont <laf...@gm...>wrote:

> I'm trying to plot Chebyshev polynolmials using:
> numpy.polynomial.Chebyshev:
>
>
> import math
> from numpy import *
> from numpy import polynomial as pol
> from pylab import *
> from scipy import *
> from scipy import optimize
> import warnings
> warnings.simplefilter('ignore', np.RankWarning)
>
>
> test = pol.Chebyshev(3)
> print test
> plot (test)
>
>
> show()
> =======================================================================
>
> The print return:      cheb([ 3.])
>
> =======================================================================
> and plot :
>
>
> Traceback (most recent call last):
>  File "T:\Dropbox\Thèse\Python\fit sonde\test_poly_Tcheb.py", line
> 32, in <module>
>    plot (test)
>  File "C:\Python27\lib\site-packages\matplotlib\pyplot.py", line 2458, in
> plot
>    ret = ax.plot(*args, **kwargs)
>  File "C:\Python27\lib\site-packages\matplotlib\axes.py", line 3849, in
> plot
>    self.add_line(line)
>  File "C:\Python27\lib\site-packages\matplotlib\axes.py", line 1443,
> in add_line
>    self._update_line_limits(line)
>  File "C:\Python27\lib\site-packages\matplotlib\axes.py", line 1451,
> in _update_line_limits
>    p = line.get_path()
>  File "C:\Python27\lib\site-packages\matplotlib\lines.py", line 644,
> in get_path
>    self.recache()
>  File "C:\Python27\lib\site-packages\matplotlib\lines.py", line 401, in
> recache
>    y = np.asarray(yconv, np.float_)
>  File "C:\Python27\lib\site-packages\numpy\core\numeric.py", line
> 235, in asarray
>    return array(a, dtype, copy=False, order=order)
> TypeError: float() argument must be a string or a number
>
>
> ------------------------------------------------------------------------------
> Write once. Port to many.
> Get the SDK and tools to simplify cross-platform app development. Create
> new or port existing apps to sell to consumers worldwide. Explore the
> Intel AppUpSM program developer opportunity. appdeveloper.intel.com/join
> http://p.sf.net/sfu/intel-appdev
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>



-- 
Daniel Hyams
dh...@gm...

I'm trying to plot Chebyshev polynolmials using: numpy.polynomial.Chebyshev:


import math
from numpy import *
from numpy import polynomial as pol
from pylab import *
from scipy import *
from scipy import optimize
import warnings
warnings.simplefilter('ignore', np.RankWarning)


test = pol.Chebyshev(3)
print test
plot (test)


show()
=======================================================================

The print return:      cheb([ 3.])

=======================================================================
and plot :


Traceback (most recent call last):
  File "T:\Dropbox\Thèse\Python\fit sonde\test_poly_Tcheb.py", line
32, in <module>
    plot (test)
  File "C:\Python27\lib\site-packages\matplotlib\pyplot.py", line 2458, in plot
    ret = ax.plot(*args, **kwargs)
  File "C:\Python27\lib\site-packages\matplotlib\axes.py", line 3849, in plot
    self.add_line(line)
  File "C:\Python27\lib\site-packages\matplotlib\axes.py", line 1443,
in add_line
    self._update_line_limits(line)
  File "C:\Python27\lib\site-packages\matplotlib\axes.py", line 1451,
in _update_line_limits
    p = line.get_path()
  File "C:\Python27\lib\site-packages\matplotlib\lines.py", line 644,
in get_path
    self.recache()
  File "C:\Python27\lib\site-packages\matplotlib\lines.py", line 401, in recache
    y = np.asarray(yconv, np.float_)
  File "C:\Python27\lib\site-packages\numpy\core\numeric.py", line
235, in asarray
    return array(a, dtype, copy=False, order=order)
TypeError: float() argument must be a string or a number

Hello All, 

I have two questions regarding the matplotlib Slider and animation. 

Question 1: How to create an image along with a Slider axes, such that the Slider values changes with time? 

Here is the example structure of the code I am trying but unsuccessful to have an animated Slider that changes with time.

def complicated_image(Timestep):
	"""Write code to create complicated image where all variables to plot are certain functions of Timestep"""
	p2 = plt.quiver(X,Y,Z1,Z2)
	p3 = plt.pcolormesh(Delta0)
	p1 = plt.contour(r,z,value,10)

	return plt.gca()  [ Question 2 : Is there are better way to return the axis so that it can be used in the animate_image function.]

def animate_image():
	f1 = figure()
	ax = gca()
	
	for i in range(100):
		ax.cla()
		ax = complicated_image(i)
		axtime = plt.axes([0.1,0.01,0.8,0.02],axisbg='white')
		stime = Slider(axtime,'TimeStep',0,100,valinit=0)
		
		f1.savefig('slidertest%03d.png'%i)


If I omit the lines containing the axtime axes (i.e. the part related to Slider) then I get the image properly that changes with time but of course without the Slider.



Regards
Bhargav Vaidya


		

On Monday, January 9, 2012, Ethan Gutmann <eth...@gm...> wrote:
> Along these lines, it looks to me like plot_surface is not shading when I
would expect it to (maybe I just have the wrong expectations?)
>
> I would expect the following to create a surface with colors from the
colormap but shading from a lightsource.
>
>        surf = ax.plot_surface(X, Y, Z, rstride=1, cstride=1,
cmap=cm.jet,shade=True)
>
> However, axes3d.py requires facecolors to be set in order to generate
facecolors to shade...
>
> mpl_toolkits/mplot3d/axes3d.py
> line 1378-1380 mpl v1.1.0
>
>        # Shade the data
>        if shade and cmap is not None and fcolors is not None:
>            fcolors = self._shade_colors_lightsource(Z, cmap, lightsource)
>
> should the if statement be:
>        if shade and cmap is not None and fcolors is None:
>
> I'm not sure if this will screw anything else up, but it makes a lot more
sense to me as an API. Maybe there are other reasons to require facecolors
to be set?
>
> Ethan

No, you are right.  This is roughly the requested feature I was talking
about.  There are multiple features in plot_surface() that are entwined and
I would like to figure out how to separate them and allow users to pick and
choose.

Features I have identified:

Coloring edgelines (complicated to determine what color)
Coloring based on colormap
Coloring based on user-spec  facecolors
Shading the colors (may or may not include edge lines)
Interpolating facecolors (for edgelines, IIRC)

These are inter-dependent and need to be made orthogonal.

Note, all of this is from memory, details might differ.

Cheers!
Ben Root

Along these lines, it looks to me like plot_surface is not shading when I would expect it to (maybe I just have the wrong expectations?)  

I would expect the following to create a surface with colors from the colormap but shading from a lightsource.   

	surf = ax.plot_surface(X, Y, Z, rstride=1, cstride=1, cmap=cm.jet,shade=True)

However, axes3d.py requires facecolors to be set in order to generate facecolors to shade...

mpl_toolkits/mplot3d/axes3d.py
line 1378-1380 mpl v1.1.0

        # Shade the data
        if shade and cmap is not None and fcolors is not None:
            fcolors = self._shade_colors_lightsource(Z, cmap, lightsource)

should the if statement be: 
        if shade and cmap is not None and fcolors is None:

I'm not sure if this will screw anything else up, but it makes a lot more sense to me as an API. Maybe there are other reasons to require facecolors to be set? 

Ethan

On Jan 9, 2012, at 10:28 AM, Zoltán Vörös wrote:

> 
> 
> On 01/09/2012 05:46 PM, Benjamin Root wrote:
>> When we said that GTK is not supported, (1) is not an official 
>> decision, I think, (2) we mean the pure GTK *backend*.  We fully 
>> support the GTKAgg backend, which is superior to the GTK backend in 
>> every way.  Please try v1.1.0 before continuing.  There were many 
>> important changes to mplot3d between v1.0.1 and v1.1.0.
> Indeed, that was the case. The surface plot works as advertised now. 
> Thanks for helping out with this! Once I have a viable code for 
> phonging, I will send it to you in a personal mail.
> Cheers,
> Zoltán
> 
> ------------------------------------------------------------------------------
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On 01/09/2012 05:46 PM, Benjamin Root wrote:
> When we said that GTK is not supported, (1) is not an official 
> decision, I think, (2) we mean the pure GTK *backend*.  We fully 
> support the GTKAgg backend, which is superior to the GTK backend in 
> every way.  Please try v1.1.0 before continuing.  There were many 
> important changes to mplot3d between v1.0.1 and v1.1.0.
Indeed, that was the case. The surface plot works as advertised now. 
Thanks for helping out with this! Once I have a viable code for 
phonging, I will send it to you in a personal mail.
Cheers,
Zoltán

2012/1/9 Zoltán Vörös <zv...@gm...>

>
> On 01/09/2012 05:30 PM, Benjamin Root wrote:
>
> The problem is that the faces themselves are transparent. But if I set
> shade to False, it becomes solid, so that must be the solution.
>
>>
>>
> What version of mpl are you using?  For me (on master) I never get
> transparent faces.
>
> I have 1.0.1 that comes with ubuntu. I was considering installing 1.1, but
> then I saw that the gtk backend is not supported, so I decided against it.
>
>
When we said that GTK is not supported, (1) is not an official decision, I
think, (2) we mean the pure GTK *backend*.  We fully support the GTKAgg
backend, which is superior to the GTK backend in every way.  Please try
v1.1.0 before continuing.  There were many important changes to mplot3d
between v1.0.1 and v1.1.0.

Ben Root

On 01/09/2012 05:30 PM, Benjamin Root wrote:
> The problem is that the faces themselves are transparent. But if I set 
> shade to False, it becomes solid, so that must be the solution.
>
>
>
> What version of mpl are you using?  For me (on master) I never get 
> transparent faces.
I have 1.0.1 that comes with ubuntu. I was considering installing 1.1, 
but then I saw that the gtk backend is not supported, so I decided 
against it.

By the way, here is an example of the transparent faces (I think it 
won't show on the mailing list). I can definitely see through the 
surface. The code I used is

for y in range(ylen):
     for x in range(xlen):
         colors[x, y] = (1, 0.0, 1, 1.)

surf = ax.plot_surface(X, Y, Z, rstride=1, cstride=1, facecolors=colors,
         linewidth=0.1, antialiased=False, shade=True)

2012/1/9 Zoltán Vörös <zv...@gm...>

>  Thanks for the reply!
>
>   surf = ax.plot_surface(X, Y, Z, rstride=1, cstride=1, facecolors=colors,
>>         linewidth=0.0, antialiased=True)
>>
>
> Is the issue that you have transparent lines between the faces?  Set the
> "shade" kwarg to True and the "antialiased" kwarg to False.
>
> The problem is that the faces themselves are transparent. But if I set
> shade to False, it becomes solid, so that must be the solution.
>
> If the shading is not what you want, it has been a feature request to
> implement the smooth coloring that shading does, but without a
> lightsource.  I have yet to do this, and there have been some attempts to
> get this right, but nothing finalized yet.  Contributions would be welcomed!
>
> OK, I will try to get this done and send you an implementation.
> Cheers,
> Zoltán
>


What version of mpl are you using?  For me (on master) I never get
transparent faces.

Ben Root

Thanks for the reply!
>
>     surf = ax.plot_surface(X, Y, Z, rstride=1, cstride=1,
>     facecolors=colors,
>             linewidth=0.0, antialiased=True)
>
>
> Is the issue that you have transparent lines between the faces?  Set 
> the "shade" kwarg to True and the "antialiased" kwarg to False.
The problem is that the faces themselves are transparent. But if I set 
shade to False, it becomes solid, so that must be the solution.
> If the shading is not what you want, it has been a feature request to 
> implement the smooth coloring that shading does, but without a 
> lightsource.  I have yet to do this, and there have been some attempts 
> to get this right, but nothing finalized yet.  Contributions would be 
> welcomed!
OK, I will try to get this done and send you an implementation.
Cheers,
Zoltán