matplotlib-users Mailing List for matplotlib

Hello Ray,

There appears to be something wrong with the way "val" is used in the 
first code section (if val==0: val = 0 ?), unless it is modified 
externally somehow?

I would also suggest adding random values or some such to make the test 
data non-periodic, so that it doesn't always look the same.

Best regards,
Brett McSweeney




ray sa <biz...@ya...> 
Sent by: mat...@li...
03/12/2007 09:50 AM

To
mat...@li...
cc

Subject
[Matplotlib-users] continuous plotting..






Hello 

I am trying to use this application to plot a diagram from a log file that 
is always active and storing data. I have written the following and I have 
issues once I touch the figure window it freezes...

from pylab import *
import time
val = 1

while True:
    inData = load('c:\\data.txt')
    x = inData[:,0]
    y = inData[:,1]
    plot(x,y,'o')
    if val == 1:
        show()
    time.sleep(1)
    if val == 0:
        val = 0
    time.sleep(1)
    draw()

I am using the following program to create some dummy data:

import time
import math

def test():
    for i in range(900):
        for rad in sineVal:
            fileData = open('c:\\data.txt','a')
            time.sleep(1) 
            fileData.write('%d' % int(i))
            fileData.write('\t')
            fileData.write('%f' % math.sin(rad))
            fileData.write('\n')
            fileData.close()
            print('*'),

def makeArray():
    tempArray = []
    for i in range(0,360,180):
        tempArray.append(i)
    return tempArray

sineVal = makeArray()

test()

You help and suggestion in the above matter will be most welcomed.

BR /ray


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Ray,

The first problem is that you are calling show() repeatedly, but show() 
should only be called once per script; it is used in non-interactive 
plotting.  Now I see that you are trying to prevent that, but the code 
as it came out in your email does not do so--val never gets set to zero.

Note that by default, repeated calls to plot overlay more and more plot 
elements; I don't think this is what you want.

To get ideas, you might look at anim.py and strip_chart_demo.py in the 
examples directory.

Eric

ray sa wrote:
> Hello
> 
> I am trying to use this application to plot a diagram from a log file 
> that is always active and storing data. I have written the following and 
> I have issues once I touch the figure window it freezes...
> 
> from pylab import *
> import time
> val = 1
> 
> while True:
>     inData = load('c:\\data.txt')
>     x = inData[:,0]
>     y = inData[:,1]
>     plot(x,y,'o')
>     if val == 1:
>         show()
>     time.sleep(1)
>     if val == 0:
>         val = 0
>     time.sleep(1)
>     draw()
> 
> I am using the following program to create some dummy data:
> 
> import time
> import math
> 
> def test():
>     for i in range(900):
>         for rad in sineVal:
>             fileData = open('c:\\data.txt','a')
>             time.sleep(1) 
>             fileData.write('%d' % int(i))
>             fileData.write('\t')
>             fileData.write('%f' % math.sin(rad))
>             fileData.write('\n')
>             fileData.close()
>             print('*'),
> 
> def makeArray():
>     tempArray = []
>     for i in range(0,360,180):
>         tempArray.append(i)
>     return tempArray
> 
> sineVal = makeArray()
> 
> test()
> 
> You help and suggestion in the above matter will be most welcomed.
> 

Hello 

I am trying to use this application to plot a diagram from a log file that is always active and storing data. I have written the following and I have issues once I touch the figure window it freezes...

from pylab import *
import time
val = 1

while True:
    inData = load('c:\\data.txt')
    x = inData[:,0]
    y = inData[:,1]
    plot(x,y,'o')
    if val == 1:
        show()
    time.sleep(1)
    if val == 0:
        val = 0
    time.sleep(1)
    draw()

I am using the following program to create some dummy data:

import time
import math

def test():
    for i in range(900):
        for rad in sineVal:
            fileData = open('c:\\data.txt','a')
            time.sleep(1)  
            fileData.write('%d' % int(i))
            fileData.write('\t')
            fileData.write('%f' % math.sin(rad))
            fileData.write('\n')
            fileData.close()
            print('*'),

def makeArray():
    tempArray = []
    for i in range(0,360,180):
        tempArray.append(i)
    return tempArray

sineVal = makeArray()

test()

You help and suggestion in the above matter will be most welcomed.

BR /ray



       
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On Dec 2, 2007 2:07 PM, Yongtao Cui <cui...@gm...> wrote:

> Could anyone give me some help?

No help here, just providing a data point for the devs.  Under linux, with

In [5]: wx.__version__
Out[5]: '2.8.4.0'

In [6]: matplotlib.__version__
Out[6]: '0.91.1'


I ran test(100) several times, no error.

Cheers,

f

Below is the minimum code with the right indent

import pylab
def test(n):
     for i in range(n):
          f=pylab.figure(1)
          f.clf()
          a=f.add_axes([0.2, 0.2, 0.6, 0.6])
          a.plot([1,2,3,4,5], 'ro')

On Dec 2, 2007 4:07 PM, Yongtao Cui <cui...@gm...> wrote:
> Hi,
>
> I got the following error when clearing and plotting on the same
> figure for many times. I found the following minimum code to reproduce
> this error. I am using matplotlib-0.91.1 and wxpython2.8 on windows
> xp. In the matplotlibrc file, I changed the backend to WXAgg and
> interactive to True.
>
> import pylab
> def test(n):
>    for i in range(n):
>        f=pylab.figure(1)
>        f.clf()
>        a=f.add_axes([0.2, 0.2, 0.6, 0.6])
>        a.plot([1,2,3,4,5], 'ro')
>
>
> The error only happens for a large n. For example, test(10) works
> fine, but test(50) will cause the error. Also runing test(10) for a
> few times will also cause the error.
>
> Could anyone give me some help?
>
> Thanks.
>
> The following is the error message:
>
> Traceback (most recent call last):
>  File "<input>", line 1, in <module>
>  File "<input>", line 3, in test
>  File "C:\Python25\Lib\site-packages\matplotlib\pyplot.py", line 191, in figure
>  File "C:\Python25\Lib\site-packages\matplotlib\backends\backend_wx.py",
> line 1227, in draw_if_interactive
>  File "C:\Python25\Lib\site-packages\matplotlib\backends\backend_wxagg.py",
> line 61, in draw
>  File "C:\Python25\Lib\site-packages\matplotlib\backends\backend_agg.py",
> line 380, in draw
>  File "C:\Python25\Lib\site-packages\matplotlib\figure.py", line 612, in draw
>  File "C:\Python25\Lib\site-packages\matplotlib\axes.py", line 1344, in draw
>  File "C:\Python25\Lib\site-packages\matplotlib\axis.py", line 596, in draw
>  File "C:\Python25\Lib\site-packages\matplotlib\axis.py", line 170, in draw
>  File "C:\Python25\Lib\site-packages\matplotlib\text.py", line 775, in draw
>  File "C:\Python25\Lib\site-packages\matplotlib\text.py", line 317, in draw
>  File "C:\Python25\Lib\site-packages\matplotlib\text.py", line 195,
> in _get_layout
>  File "C:\Python25\Lib\site-packages\matplotlib\backends\backend_agg.py",
> line 234, in get_text_width_height_descent
>  File "C:\Python25\Lib\site-packages\matplotlib\backends\backend_agg.py",
> line 301, in _get_agg_font
> RuntimeError: Could not open facefile
> C:\Python25\lib\site-packages\matplotlib\mpl-data\fonts\ttf\Vera.ttf;
> Cannot_Open_Resource
>

Hi,

I got the following error when clearing and plotting on the same
figure for many times. I found the following minimum code to reproduce
this error. I am using matplotlib-0.91.1 and wxpython2.8 on windows
xp. In the matplotlibrc file, I changed the backend to WXAgg and
interactive to True.

import pylab
def test(n):
    for i in range(n):
        f=pylab.figure(1)
        f.clf()
        a=f.add_axes([0.2, 0.2, 0.6, 0.6])
        a.plot([1,2,3,4,5], 'ro')


The error only happens for a large n. For example, test(10) works
fine, but test(50) will cause the error. Also runing test(10) for a
few times will also cause the error.

Could anyone give me some help?

Thanks.

The following is the error message:

Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "<input>", line 3, in test
  File "C:\Python25\Lib\site-packages\matplotlib\pyplot.py", line 191, in figure
  File "C:\Python25\Lib\site-packages\matplotlib\backends\backend_wx.py",
line 1227, in draw_if_interactive
  File "C:\Python25\Lib\site-packages\matplotlib\backends\backend_wxagg.py",
line 61, in draw
  File "C:\Python25\Lib\site-packages\matplotlib\backends\backend_agg.py",
line 380, in draw
  File "C:\Python25\Lib\site-packages\matplotlib\figure.py", line 612, in draw
  File "C:\Python25\Lib\site-packages\matplotlib\axes.py", line 1344, in draw
  File "C:\Python25\Lib\site-packages\matplotlib\axis.py", line 596, in draw
  File "C:\Python25\Lib\site-packages\matplotlib\axis.py", line 170, in draw
  File "C:\Python25\Lib\site-packages\matplotlib\text.py", line 775, in draw
  File "C:\Python25\Lib\site-packages\matplotlib\text.py", line 317, in draw
  File "C:\Python25\Lib\site-packages\matplotlib\text.py", line 195,
in _get_layout
  File "C:\Python25\Lib\site-packages\matplotlib\backends\backend_agg.py",
line 234, in get_text_width_height_descent
  File "C:\Python25\Lib\site-packages\matplotlib\backends\backend_agg.py",
line 301, in _get_agg_font
RuntimeError: Could not open facefile
C:\Python25\lib\site-packages\matplotlib\mpl-data\fonts\ttf\Vera.ttf;
Cannot_Open_Resource

Xavier Gnata wrote:
>=20
> Hi,
>=20
> Quoting  matplotlib/__init__.py :
>=20
> def checkdep_ghostscript():
>     try:
>         if sys.platform =3D=3D 'win32':
>             command =3D 'gswin32c -v'
>         else:
>             command =3D 'gs -v'
>         stdin, stdout =3D os.popen4(command)
>         line =3D stdout.readlines()[0]
>         v =3D line.split()[2]
>         vtest =3D '.'.join(v.split('.')[:2]) # deal with version numbers=
=20
> like '7.07.1'
>         float(vtest)
>         return vtest
>     except (IndexError, ValueError):
>         return None
>=20
> It fails on debian sid because 'gs -v' returns "GPL Ghostscript SVN=20
> PRE-RELEASE 8.61 (2007-08-02)\n"
>=20
> Anyway, the parser will be ugly because it has to deal with version=20
> numbers like '7.07.1'.
> Should I propose a trivial patch to get thinks working on debian sid ?
>=20
> Xavier
> ps :Why is there no standard way (like -v or --version) on *unix to get=
=20
> the version *number*?? Only the version number. Why :(
>=20
> --=20
> ############################################
> Xavier Gnata
> CRAL - Observatoire de Lyon
> 9, avenue Charles Andr=C3=A9
> 69561 Saint Genis Laval cedex
> Phone: +33 4 78 86 85 28
> Fax: +33 4 78 86 83 86
> E-mail: gn...@ob...
> ############################################=20
>=20
>=20
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Microsoft
> Defy all challenges. Microsoft(R) Visual Studio 2005.
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> _______________________________________________
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> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>=20
>=20

Yeah , I did face the same problem . My code is following:=20
There seems to be something wrong in "ax.imshow(im)", I can't get the answe=
r
, Can sb help me .=20
The error message"ValueError: need more than 0 values to unpack"
Thank you .

# -*- coding:gb2312 -*-=20
import wx
from pylab import *
from matplotlib.backends.backend_wx import FigureCanvasWx
from matplotlib.figure import Figure
from matplotlib.axes import *
from numpy import *

#-------------------------------------------------------------
x=3Darray(range(0,100))
y=3Darray(range(0,100))
z=3Drand(100,100)
figure(1)
im=3Dimshow(z, interpolation=3D'bilinear', origin=3D'lower',cmap=3Dcm.gray,
extent=3D(0,100,0,100))
levels =3D arange(0.3, 0.4, 0.9)
contour(x,y,z,levels,origin=3D'lower',linewidths=3D2,extent=3D(0,100,0,100)=
)


fig=3Dfigure(2)
ax =3D fig.add_subplot(111)
ax.imshow(im)
ax.set_xlim(0,3)
ax.set_ylim(0,2)
show()






--=20
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%3A-gs-version-parsing-problem-tf4821980.html#a14114656
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Hi All,

I'm running into the following error when I try to run any of the matplotlib
examples:

$ python anim.py
Traceback (most recent call last):
  File "anim.py", line 19, in <module>
    import pylab as p
  File "C:\Python25\Lib\site-packages\pylab.py", line 1, in <module>
    from matplotlib.pylab import *
  File "C:\Python25\Lib\site-packages\matplotlib\pylab.py", line 206, in
<module>
    from matplotlib.numerix import npyma as ma
  File "C:\Python25\Lib\site-packages\matplotlib\numerix\__init__.py", line
20, in <module>
    from matplotlib import rcParams, verbose
ImportError: cannot import name rcParams

I'm using the latest versions of matplotlib and numpy, ActivePython 2.5 (all
for Windows XP).  Any help would be appreciated.

Regards,
Brian.

The following run well . But I just want to make the image, with the x and y
as axis and z as the image value ,show on the figure. In the pylab , we can
just give a command "imshow" ,But here , I fail to do it , I have try
ax.imshow() again and again ,but fail. Can sb give me some advice . Thank
you . 


import matplotlib 
matplotlib.use("WXAgg") 
matplotlib.interactive(True) 
from matplotlib.backends.backend_wx import FigureCanvasWx 
from matplotlib.figure import Figure 
from matplotlib.axes import * 
from numpy import * 
import wx 
from pylab import * 
    
#--------------------------------------------------- 

class DynamicPlot(): 
    def __init__(self,Frame): 
        delta = 0.025 
        x = arange(-3.0, 3.0, delta) 
        y = arange(-2.0, 2.0, delta) 
        X, Y = meshgrid(x, y) 
        Z1 = bivariate_normal(X, Y, 1.0, 1.0, 0.0, 0.0) 
        Z2 = bivariate_normal(X, Y, 1.5, 0.5, 1, 1) 
        Z = 10.0 * (Z2 - Z1)       
        levels = arange(-1.2, 1.6, 0.2)       
        self.fig = Figure((8,8), 75) 
        self.canvas = FigureCanvasWx(Frame, -1, self.fig) 
        ax=self.fig.add_axes([0.1,0.1,0.8,0.8]) 
       
ax.contour(X,Y,Z,levels,origin='lower',linewidths=2,extent=(-3,3,-2,2)) 
app = wx.PySimpleApp() 
f=wx.Frame(None,size=(600,600)) 
f.Show(True) 
DynamicPlot(f) 
app.MainLoop()
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Hi.  I installed matplotlib and get the following when I import pylab:

In [8]: import pylab
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)

C:\Documents and Settings\luke\Desktop\<ipython console> in <module>()

C:\Python25\Lib\site-packages\pylab.py in <module>()
----> 1 from matplotlib.pylab import *
      2 import matplotlib.pylab
      3 __doc__ = matplotlib.pylab.__doc__

C:\Python25\Lib\site-packages\matplotlib\pylab.py in <module>()
    204 # replace the present numpy.ma implementation in a future
    205 # numpy release.
--> 206 from matplotlib.numerix import npyma as ma
    207
    208 from matplotlib import mpl  # pulls in most modules

C:\Python25\Lib\site-packages\matplotlib\numerix\__init__.py in <module>()
     18
     19 import sys, os, struct
---> 20 from matplotlib import rcParams, verbose
     21
     22 which = None, None

ImportError: cannot import name rcParams

Any ideas?  I searched and found one hit, but no solution...
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