matplotlib-users Mailing List for matplotlib

please, help me on this!


On Tue, 29 Mar 2005 10:11:20 -0800, Jan Rienyer Gadil <jr...@gm...> wrote:
> any help will be very much appreciated...
> or could you suggest a better implementation of this graphing part
> 
> 
> On Tue, 29 Mar 2005 08:54:06 -0800, Jan Rienyer Gadil <jr...@gm...> wrote:
> > could anyone show me how to incorporate this example on my GUI?
> >
> > what i want to do is to implement this in a wxPanel that is part of my
> > wxFrame, but i am getting errors that says wxPanel instance has no
> > attribute GetToolBar...
> >
> > how am i going to get around with this???
> >
> > actually, i am doing this because i'm making a graph based on some
> > data stored on a list. what i am thinking is to just replace t,s,and c
> > part of this example with my group of list :
> >
> > def plot_data(self):
> >         # Use ths line if using a toolbar
> >         a = self.fig.add_subplot(111)
> >
> >         # Or this one if there is no toolbar
> >         #a = Subplot(self.fig, 111)
> >
> >         t = numpy.arange(0.0,3.0,0.01)
> >         s = numpy.sin(2*numpy.pi*t)
> >         c = numpy.cos(2*numpy.pi*t)
> >         a.plot(t,s)
> >         a.plot(t,c)
> >         self.toolbar.update()
> >
> > please, i need help asap...
> >
>

Hi,

I'm trying to embed matplotlib on WX (which seems to work well for the=20
moment). I'd like to avoid the wx mainloop() by making it run in a=20
different thread than that of my main program.

The classical way of doing (using show() ) doesn't work. The first time,=20
the figure becomes the main thread and my program stops running until I=20
close the window. The second time I call it though, my program remains=20
the main thread... Check the following code


import threading

import matplotlib
matplotlib.use('WX')
from matplotlib.pylab import *

def f():
    fig =3D Figure(figsize=3D(8,6))
    data =3D range(10)
    plot(data)
    show()

f()
print 'here'
f()
print 'here'
f()

The screen prints 'here' only after closing the figure with the mouse.=20
Then second figure appears, but the screen prints 'end' without me=20
having to close the figure like the first one. The third figure though=20
does not appear at all!

What am I doing wrong? I know I can use the show command only once, but=20
my program runs sequently and I need to plot data while it runs. I also=20
tried to run this function in a different thread but the results are=20
similar :

t =3D threading.Thread(target =3D f)
t.start()
print 'here'
tt =3D threading.Thread(target =3D f)
tt.start()
print 'end'

If the last three lines are neglected (plot only once), then it works=20
perfectly! My main program terminates its execution and the figure stays=20
alive until I close it. When f() is called two times though, both=20
windows close when my program terminates...

Does anyone have an idea of how I should do this?

Thanks in advance,
Kosta

PS: I also ttried the example embedding-in-wx-2.py which seems to be=20
exactly my case for embedding my program in a GUI. The best would be=20
running that example in a different thread or something like that in=20
order to avoid the mainloop(). Any ideas?

--=20

Kosta Gaitanis

Laboratoire de T=E9l=E9communications et T=E9l=E9d=E9tection - TELE
Universit=E9 catholique de Louvain UCL - FSA / ELEC
B=E2timent Stevin, a.156
Place du Levant, 2
B-1348 Louvain-La-Neuve, Belgium
Tel: +32 10/47.80.75
e-mail: gai...@te...=20

any help will be very much appreciated...
or could you suggest a better implementation of this graphing part


On Tue, 29 Mar 2005 08:54:06 -0800, Jan Rienyer Gadil <jr...@gm...> wrote:
> could anyone show me how to incorporate this example on my GUI?
> 
> what i want to do is to implement this in a wxPanel that is part of my
> wxFrame, but i am getting errors that says wxPanel instance has no
> attribute GetToolBar...
> 
> how am i going to get around with this???
> 
> actually, i am doing this because i'm making a graph based on some
> data stored on a list. what i am thinking is to just replace t,s,and c
> part of this example with my group of list :
> 
> def plot_data(self):
>         # Use ths line if using a toolbar
>         a = self.fig.add_subplot(111)
> 
>         # Or this one if there is no toolbar
>         #a = Subplot(self.fig, 111)
> 
>         t = numpy.arange(0.0,3.0,0.01)
>         s = numpy.sin(2*numpy.pi*t)
>         c = numpy.cos(2*numpy.pi*t)
>         a.plot(t,s)
>         a.plot(t,c)
>         self.toolbar.update()
> 
> please, i need help asap...
>

>>>>> "Humufr" == Humufr  <hu...@ya...> writes:

    Humufr> I obtain an error message when I tried to use the quiver
    Humufr> sample: Traceback (most recent call last): File
    Humufr> "quiver_demo.py", line 8, in ?  quiver( X, Y, U, V, 0.2,
    Humufr> color=True ) File
    Humufr> "/usr/local/lib/python2.4/site-packages/matplotlib/pylab.py",
    Humufr> line 2105, in quiver ret = gca().quiver(*args, **kwargs)
    Humufr> File
    Humufr> "/usr/local/lib/python2.4/site-packages/matplotlib/axes.py",
    Humufr> line 894, in quiver if C: File
    Humufr> "/usr/local/lib/python2.4/site-packages/numarray/generic.py",
    Humufr> line 490, in __nonzero__ raise RuntimeError("An array
    Humufr> doesn't make sense as a truth value.  Use any(a) or
    Humufr> all(a).")  RuntimeError: An array doesn't make sense as a
    Humufr> truth value.  Use any(a) or all(a).


Thanks for the report.  Replace line 894 in axes.py

OLD:
        if C:

NEW
        if C is not None:


JDH

I obtain an error message when I tried to use the quiver sample:

Traceback (most recent call last):
  File "quiver_demo.py", line 8, in ?
    quiver( X, Y, U, V, 0.2, color=True )
  File "/usr/local/lib/python2.4/site-packages/matplotlib/pylab.py", 
line 2105, in quiver
    ret =  gca().quiver(*args, **kwargs)
  File "/usr/local/lib/python2.4/site-packages/matplotlib/axes.py", line 
894, in quiver
    if C:
  File "/usr/local/lib/python2.4/site-packages/numarray/generic.py", 
line 490, in __nonzero__
    raise RuntimeError("An array doesn't make sense as a truth value.  
Use any(a) or all(a).")
RuntimeError: An array doesn't make sense as a truth value.  Use any(a) 
or all(a).

with:

cvs status lib/matplotlib/axes.py
===================================================================
File: axes.py           Status: Up-to-date

   Working revision:    1.86
   Repository revision: 1.86    
/cvsroot/matplotlib/matplotlib/lib/matplotlib/axes.py,v


and numarray 1.2.3


    N.

Michael Brady wrote:

> When using Basemap with a Mercator projection, is there a simple way 
> to tell the Axes to label the y-axis ticks in latitude degrees instead 
> of native map coord meters?
>
> Here's the way I did it.  I created my own Formatter:
>
>
> class MercYAxisFormatter( matplotlib.ticker.Formatter ):
>    """The format function for Mercator projection Y-axis.
>    Translates plot y in meters to latitude.
>    """
>
>    def __init__( self, baseMap ):
>       self.baseMap = baseMap
>
>    def __call__( self, y, pos=1 ):
>       """Return the label for tick value y at position pos.
>       """
>
>       lon, lat = self.baseMap( 0.0, y, inverse=True )
>       return "%.0f" % lat
>
>
> and added it like so:
>
>   baseMap = Basemap( ... )
>   ax.yaxis.set_major_formatter( MercYAxisFormatter( baseMap ) )
>
>
> This works just fine, but is there a simple one-liner in Basemap that 
> I'm missing that does this?
>
> Thanks,
>
> Michael
>
Michael:  No, you're not missing anything - the functionality of basemap 
is rather basic at this point.  Thanks for the tip though!

-Jeff

-- 
Jeffrey S. Whitaker         Phone  : (303)497-6313
Meteorologist               FAX    : (303)497-6449
NOAA/OAR/CDC  R/CDC1        Email  : Jef...@no...
325 Broadway                Office : Skaggs Research Cntr 1D-124
Boulder, CO, USA 80303-3328 Web    : http://tinyurl.com/5telg

I've been trying in vain to get the correct format for
the y-axis.  I am doing an intraday financial chart
and would like to label the ticks every 5 minutes.  I
am following the example located @
http://matplotlib.sourceforge.net/screenshots/finance_work2.py
Data gets loaded from the CSV file just like in the
example.

I have something along these lines:

hours = HourLocator()
minutes = MinuteLocator()
timeFmt = DateFormatter('%H:%M')

ax.xaxis.set_major_locator(hours)
ax.xaxis.set_minor_locator(minutes)
ax.xaxis.set_minor_formatter(timeFmt)

ax.autoscale_view()

Am I too far off target here?  Because I can't get it
to work.

I've also looked at the user's manual (5.4 example 2:
date ticking).  Could someone please point me in the
right direction or provide an example of how it
_should_ be done?  Thank you in advance.


		
__________________________________ 
Do you Yahoo!? 
Yahoo! Small Business - Try our new resources site!
http://smallbusiness.yahoo.com/resources/ 

When using Basemap with a Mercator projection, is there a simple way to 
tell the Axes to label the y-axis ticks in latitude degrees instead of 
native map coord meters?

Here's the way I did it.  I created my own Formatter:


class MercYAxisFormatter( matplotlib.ticker.Formatter ):
    """The format function for Mercator projection Y-axis.
    Translates plot y in meters to latitude.
    """

    def __init__( self, baseMap ):
       self.baseMap = baseMap

    def __call__( self, y, pos=1 ):
       """Return the label for tick value y at position pos.
       """

       lon, lat = self.baseMap( 0.0, y, inverse=True )
       return "%.0f" % lat


and added it like so:

   baseMap = Basemap( ... )
   ax.yaxis.set_major_formatter( MercYAxisFormatter( baseMap ) )


This works just fine, but is there a simple one-liner in Basemap that I'm 
missing that does this?

Thanks,

Michael

-- 
========================================================================
  Michael Brady
  Jet Propulsion Laboratory (M/S 301-140L)
  4800 Oak Grove Drive
  Pasadena, CA  91109                 E-mail: Michael.Brady@...
========================================================================

could anyone show me how to incorporate this example on my GUI?

what i want to do is to implement this in a wxPanel that is part of my
wxFrame, but i am getting errors that says wxPanel instance has no
attribute GetToolBar...

how am i going to get around with this???

actually, i am doing this because i'm making a graph based on some
data stored on a list. what i am thinking is to just replace t,s,and c
part of this example with my group of list :

def plot_data(self):
        # Use ths line if using a toolbar
        a = self.fig.add_subplot(111)
        
        # Or this one if there is no toolbar
        #a = Subplot(self.fig, 111)
        
        t = numpy.arange(0.0,3.0,0.01)
        s = numpy.sin(2*numpy.pi*t)
        c = numpy.cos(2*numpy.pi*t)
        a.plot(t,s)
        a.plot(t,c)
        self.toolbar.update()

please, i need help asap...

jdh...@ac... a écrit :
> We are in favor of unicode support in agg, we just haven't had the
> time, knowledge or man-power to do it.  fonts are hard, as you
> probably know, and we have to figure out the right handling in
> freetype and the ft2font wrapper, in the pycxx extension generating
> code, and in the font manager.  All manageable, but tough.

It sounds good and I know this is a hard job even if I have no idea of 
how things get work in matplotlib! Having unicode without Agg is already 
great to me.

> 
> Have you seen the accented character demo?
> 
>   http://matplotlib.sf.net/examples/accented_text.py

Yes I have but was a little bit disappointed since this nested 
expression fails (matplotlib 0.72):

\rm{\acute{e}}

> Hopefully, someone (maybe you <wink>) will find the time to tackle
> unicode support for ft2font, font_manager, and backend_agg in the
> not-too-distant-future.
> 
> JDH

Believe me I would really be glad to participate to the matplotlib 
source code. Unfortunately I don't think I have the required skills 
(unless you know some introducing pages that could change my opinion?) 
and my company - a research centre - isn't mature enough to let us 
participate to open source :-(. It is even hard to make people accept 
open source software for everyday use... They don't feel secure if do 
not pay for!


JM. Philippe