matplotlib-users Mailing List for matplotlib

Heh, strange... I could have sworn that the reference counter decrements
were there... Ok, looks like everything is where it should be, I guess.
Ben Root
On Mon, Dec 5, 2011 at 1:44 PM, Michael Droettboom <md...@st...> wrote:
> It looks like this is already on 1.1.x, but not in the 1.1.0 release. Or
> am I missing something?
>
> Mike
>
>
> On 12/01/2011 12:24 PM, Benjamin Root wrote:
>
> On Thu, Dec 1, 2011 at 10:14 AM, Benjamin Root <ben...@ou...> wrote:
>
>> On Thu, Dec 1, 2011 at 9:29 AM, Neilen Marais <nm...@sk...> wrote:
>>
>>> https://github.com/matplotlib/matplotlib/commit
>>> /98ee4e991ae142622f3814db193b75236eb77cea#src/ft2font.cpp
>>
>>
>> Hmm, strange...
>>
>> It isn't even in master right now. The last changes to it were by
>> Michael Droettboom (commit 6b643862) in June of 2010, but the commit you
>> are pointing to was done in March of 2011... this needs more investigating.
>>
>> Ben Root
>>
>>
> Strange, I could have sworn that I rebased my master branch correctly.
> Now, the fix is showing in master. Well, now that that has been resolved,
> I guess we can just simply cherry-pick that commit into v1.1.x?
>
> Ben Root
>
>
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>
>
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>
>
>
>
> ------------------------------------------------------------------------------
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> contains a definitive record of customers, application performance,
> security threats, fraudulent activity, and more. Splunk takes this
> data and makes sense of it. IT sense. And common sense.
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On 12/5/11 12:44 , mat...@li... wrote:
> Date: Sun, 4 Dec 2011 23:13:42 +0100
> From: Piter_<x....@gm...>
> Subject: [Matplotlib-users] latex and mathin y x labels?
>
> Hi all.
> I have tried to add fractions, superscript and some other symbols in
> axis labels using latex or mathtext. But then they are different to
> much from other text.
> Is there any trick to make them look the same?
> Thanks.
> Petro.
I think you want to put:
mathtext.default : regular
in your "matplotlibrc" file (~/.matplotlib/matplotlibrc on Linux and Mac 
systems)
HTH,
Jonathan

If I'm understanding your question correctly and reading your code correctly, you're asking why the timer method of doing things works, but the principal() while loop method does not.
I had a couple solutions that involved the main event loop, but I just noticed 2 main things that are probably wrong with your code:
1. You are calling 'principal' from inside __init__ so you never actually return from __init__ which means that you never call "window.show()" and therefore never call "qApp.exec_()". If you really want to use the 'principal' method you would have to connect it to a one shot timer anyway to have it run after you have started the application ('qApp.exec_()'). I think the recommended way would be to use the timer the way you did in your latest email.
2. At least in the way my email client reads your original code, your calls to the matplotlib drawing functions aren't inside the while loop and the while loop never ends...although this doesn't matter if you don't fix #1 above.
Hope that made sense.
-Dave
On 12/5/11 1:44 PM, mat...@li... wrote:
> Message: 3
> Date: Mon, 5 Dec 2011 15:46:02 +0100
> From: Fabien Lafont<laf...@gm...>
> Subject: Re: [Matplotlib-users] [ploting data] Live data
> Cc:mat...@li...
> Message-ID:
> 	<CAC9H_cjrgQBE6e6+jzZHyfYHonTeAg0XwU7c_2G-hu=s+...@ma...>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Thx all for your remarks,
>
> I can't understand why this code works (when I use the timer method):

Hello,
I am new to this list, but not totally to matplotlib.
I installed v1.1.0 lately, and i noticed that something went wrong (or,
not as before) with fcontour(). 
It looks like the range of colors used to fill in, is not set correctly.
Sorry, i cannot really tel it better, but i have a piece of source code,
that highlights the phenomenon : 
#!/usr/bin/python
import os
import sys
from pylab import *
# parameters we bach on
x = linspace(-10,10,30)
y = linspace(-4,4,30)
X,Y = meshgrid(x,y)
F = 0.5*X**2 + (7*Y**2)/2
fig = figure(num=None, figsize=(6, 6), dpi=80, facecolor='#666666',
edgecolor='k')
ax = fig.gca()
cmap=get_cmap('reds')
plage = arange(0,100,1)
surf = contourf(X,Y,F, plage)
plage = arange(0,100,2)
surf = contour(X,Y,F, plage, linewidths=2)
ax.grid(True)
fig.colorbar(surf, shrink=0.5, aspect=5)
axis([x.min(),x.max(),y.min(),y.max()])
show()
I ran it with pyV2.6/matplotlibV0.99.1, and it behaves differently with
pyV2.7/matplotlibV1.1.0 .
Could you confirm that on your computer, if this is an expected
behaviour, and, if not, if you have an idea about how to fix it ?
thanks a lot,
Arnaud.

Set the rcParam "mathtext.default" to "regular".
Mike
On 12/04/2011 05:13 PM, Piter_ wrote:
> Hi all.
> I have tried to add fractions, superscript and some other symbols in
> axis labels using latex or mathtext. But then they are different to
> much from other text.
> Is there any trick to make them look the same?
> Thanks.
> Petro.
>
> ------------------------------------------------------------------------------
> All the data continuously generated in your IT infrastructure
> contains a definitive record of customers, application performance,
> security threats, fraudulent activity, and more. Splunk takes this
> data and makes sense of it. IT sense. And common sense.
> http://p.sf.net/sfu/splunk-novd2d
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users

What rcParams are you setting?
font.family: serif
font.serif: Times New Roman
and
font.family: Times New Roman
both work for me.
You have to use the name of the font as specified in the file, not the 
filename to specify the font (which is probably why "times" is not 
working for you).
Mike
On 12/05/2011 01:38 PM, Jonathan Slavin wrote:
> Tony,
>
> Thanks for your answer. I'm running on CentOS Linux. Unfortunately
> there is no such command as font_manager.X11InstalledFonts(), though
> there is font_manager.x11FontDirectory(). When I do that I get a list
> with a bunch of directories including '/usr/share/msttcorefonts', which
> contains the times.ttf which has the Times New Roman font I wanted. And
> by doing things like:
> fprop = font_manager.FontProperties(fname=
> '/usr/share/fonts/msttcorefonts/times.ttf')
> set_xlabel('X title',fontproperties=fprop)
> xticklabels = plt.getp(plt.gca(), 'xticklabels')
> plt.setp(xticklabels, fontproperties=fprop)
>
> I can get the fonts I want for xlabel, ylabel, etc., but I still can't
> get that font set as the default font (using, for example 'times' for
> the value for serif, or for family). For some reason setting the
> rcParam doesn't work. In the context in which it's invoked to find the
> font, the font manager can't find it. So far I haven't been able to
> track down the problem.
>
> Jon
>
> On Fri, 2011年12月02日 at 17:30 -0500, Tony Yu wrote:
>> On Fri, Dec 2, 2011 at 4:13 PM, Jonathan Slavin
>> <js...@cf...> wrote:
>> Hi all,
>>
>> I've been trying to use a different serif font for a plot and
>> have been
>> running into problems. I thought I could just do something
>> like:
>>
>> from matplotlib import rc
>> rc('font', family='serif', serif='Times New Roman')
>>
>> but if I try that I end up getting:
>> findfont: Font family ['serif'] not found. Falling back to
>> Bitstream
>> Vera Sans
>>
>> It works fine without the serif='...' part and gives me the
>> default
>> serif font. I know that Times New Roman exists on my system
>> -- at least
>> the GNOME character map can find it. Perhaps I need to use a
>> different
>> alias (but what would it be?). Any help would appreciated.
>>
>> Jon
>>
>>
>> You should check what fonts are installed on your system:
>>
>>>>> from matplotlib import font_manager
>>>>> font_manager.OSXInstalledFonts()
>> (or if you're on a different system, try MSInstalledFonts or
>> X11InstalledFonts---those aren't available on my system, but
>> presumably that's just because I'm using OSX). If that works, then
>> look for Times New Roman in what's printed out. If it is, the problem
>> may be that it's not the right format: it appears as if the
>> font_manager only supports .ttf and .afm fonts.
>>
>> If you don't see Times New Roman in any of those files, check the
>> output of
>>
>>>>> mpl.font_manager.OSXFontDirectories
>> (replacing OSX with MS or X11, if needed). If the listed directories
>> doesn't match your installation of Times New Roman, that's your
>> problem. (I'm not sure if there's a good way of adding directories.)
>>
>> Cheers,
>> -Tony
>>
>
>
> ------------------------------------------------------------------------------
> All the data continuously generated in your IT infrastructure
> contains a definitive record of customers, application performance,
> security threats, fraudulent activity, and more. Splunk takes this
> data and makes sense of it. IT sense. And common sense.
> http://p.sf.net/sfu/splunk-novd2d
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users

It looks like this is already on 1.1.x, but not in the 1.1.0 release. 
Or am I missing something?
Mike
On 12/01/2011 12:24 PM, Benjamin Root wrote:
> On Thu, Dec 1, 2011 at 10:14 AM, Benjamin Root <ben...@ou... 
> <mailto:ben...@ou...>> wrote:
>
> On Thu, Dec 1, 2011 at 9:29 AM, Neilen Marais <nm...@sk...
> <mailto:nm...@sk...>> wrote:
>
> https://github.com/matplotlib/matplotlib/commit
> /98ee4e991ae142622f3814db193b75236eb77cea#src/ft2font.cpp
>
>
> Hmm, strange...
>
> It isn't even in master right now. The last changes to it were by
> Michael Droettboom (commit 6b643862) in June of 2010, but the
> commit you are pointing to was done in March of 2011... this needs
> more investigating.
>
> Ben Root
>
>
> Strange, I could have sworn that I rebased my master branch 
> correctly. Now, the fix is showing in master. Well, now that that 
> has been resolved, I guess we can just simply cherry-pick that commit 
> into v1.1.x?
>
> Ben Root
>
>
> ------------------------------------------------------------------------------
> All the data continuously generated in your IT infrastructure
> contains a definitive record of customers, application performance,
> security threats, fraudulent activity, and more. Splunk takes this
> data and makes sense of it. IT sense. And common sense.
> http://p.sf.net/sfu/splunk-novd2d
>
>
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users

Tony,
Thanks for your answer. I'm running on CentOS Linux. Unfortunately
there is no such command as font_manager.X11InstalledFonts(), though
there is font_manager.x11FontDirectory(). When I do that I get a list
with a bunch of directories including '/usr/share/msttcorefonts', which
contains the times.ttf which has the Times New Roman font I wanted. And
by doing things like:
fprop = font_manager.FontProperties(fname=
 '/usr/share/fonts/msttcorefonts/times.ttf')
set_xlabel('X title',fontproperties=fprop)
xticklabels = plt.getp(plt.gca(), 'xticklabels')
plt.setp(xticklabels, fontproperties=fprop)
I can get the fonts I want for xlabel, ylabel, etc., but I still can't
get that font set as the default font (using, for example 'times' for
the value for serif, or for family). For some reason setting the
rcParam doesn't work. In the context in which it's invoked to find the
font, the font manager can't find it. So far I haven't been able to
track down the problem.
Jon
On Fri, 2011年12月02日 at 17:30 -0500, Tony Yu wrote:
> On Fri, Dec 2, 2011 at 4:13 PM, Jonathan Slavin
> <js...@cf...> wrote:
> Hi all,
> 
> I've been trying to use a different serif font for a plot and
> have been
> running into problems. I thought I could just do something
> like:
> 
> from matplotlib import rc
> rc('font', family='serif', serif='Times New Roman')
> 
> but if I try that I end up getting:
> findfont: Font family ['serif'] not found. Falling back to
> Bitstream
> Vera Sans
> 
> It works fine without the serif='...' part and gives me the
> default
> serif font. I know that Times New Roman exists on my system
> -- at least
> the GNOME character map can find it. Perhaps I need to use a
> different
> alias (but what would it be?). Any help would appreciated.
> 
> Jon
> 
> 
> You should check what fonts are installed on your system:
> 
> >>> from matplotlib import font_manager
> >>> font_manager.OSXInstalledFonts()
> 
> (or if you're on a different system, try MSInstalledFonts or
> X11InstalledFonts---those aren't available on my system, but
> presumably that's just because I'm using OSX). If that works, then
> look for Times New Roman in what's printed out. If it is, the problem
> may be that it's not the right format: it appears as if the
> font_manager only supports .ttf and .afm fonts.
> 
> If you don't see Times New Roman in any of those files, check the
> output of
> 
> >>> mpl.font_manager.OSXFontDirectories
> 
> (replacing OSX with MS or X11, if needed). If the listed directories
> doesn't match your installation of Times New Roman, that's your
> problem. (I'm not sure if there's a good way of adding directories.)
> 
> Cheers,
> -Tony
> 

I am trying to put two regression lines on one scatter plot, but the dashes on the lines are inconsistent. I get different length dashes in different spots, and this won't be acceptable for publication I imagine. Do you have nay idea of what could be causing this? I've thought it could be related to the backend but all of them seem to produce the same result. Thanks.
Jason

Hi,
You are right. I have tried set_array before, but forgot to mention
it. I have retried now and got it working. Like you said one has to
ravel() the array and use this with QuadMeshs set_array function.
Thanks.
Manuel
2011年12月4日 Tony Yu <ts...@gm...>:
>
>
> On Sun, Dec 4, 2011 at 9:59 AM, Manuel Jung <mj...@as...>
> wrote:
>>
>> Hi,
>>
>> I have plt.pcolormesh plot i would like to animate. So i've taken a
>> look at the various examples and decided to go with the FuncAnimation
>> routine. This works for me, but im using for every frame a new call to
>> plt.colormesh and i am not updating the underlaying data, like in this
>> example
>> http://matplotlib.sourceforge.net/examples/animation/dynamic_image.html
>> This is because there seems to be no set_data, set_array or similar
>> for the from plt.colormesh returned object (an instance of
>> matplotlib.collection.QuadMesh). Am i right? Is there any way i can
>> update the data structures of plt.colormesh?
>>
> Hi Manuel,
>
> You can call QuadMesh's `set_array` method, just as you can for images. (You
> suggest there is no set_array method for QuadMesh; are you sure about that?)
> The strange part is that it expects a 1d array, where as colormesh accepts
> arrays of various dimensions.
>
>>>> import numpy as np
>>>> import matplotlib.pyplot as plt
>>>> mesh = plt.pcolormesh(np.random.rand(10,10))
>>>> mesh.set_array(np.random.rand(10,10).ravel())
>>>> plt.draw()
>
> set_array doesn't complain if you remove the call to `ravel`, but
> `plt.draw()` will complain.
>
> -Tony

Thx all for your remarks,
I can't understand why this code works (when I use the timer method):
# -*- coding: utf-8 -*-
"""
Created on Fri Dec 02 17:10:22 2011
@author: lafont
"""
#!/usr/bin/env python
from visa import *
from pylab import *
import sys
from PyQt4 import QtGui
import numpy as np
from matplotlib.figure import Figure
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.backends.backend_qt4agg import NavigationToolbar2QTAgg
as NavigationToolbar
#===============================================================================
#
#===============================================================================
class CPUMonitor(FigureCanvas):
 """Matplotlib Figure widget"""
 def __init__(self,parent):
 # first image setup
 self.fig = Figure()
 self.ax = self.fig.add_subplot(111)
 # initialization of the canvas
 FigureCanvas.__init__(self, self.fig)
 # set specific limits for X and Y axes
# self.ax.set_xlim(0, 40)
# self.ax.set_ylim(0, 1.5)
#
 FigureCanvas.updateGeometry(self)
 # generates first "empty" plots
 self.user, self.nice = [], []
 self.l_user, = self.ax.plot([], self.user, label='Voltage')
 self.l_nice, = self.ax.plot([], self.nice, label='Voltage2')
 # add legend to plot
 self.ax.legend()
 # force a redraw of the Figure
 self.fig.canvas.draw()
 # start the timer, to trigger an event every x milliseconds)
 self.timer = self.startTimer(1000)
 self.timerEvent(None)
 def get_info(self):
 return [0.8]
	
 def get_info2(self) :
 return [0.9]
 def set_voltage(self) :
 print "ok"
#
 def timerEvent(self, evt):
 """Custom timerEvent code, called upon timer event receive"""
 result1 = self.get_info()
 result2 = self.get_info2()
# append new data to the datasets
 self.user.append(result1)
 self.nice.append(result2)
 # update lines data using the lists with new data
 self.l_user.set_data(range(len(self.user)), self.user)
 self.l_nice.set_data(range(len(self.nice)), self.nice)
	
 # force a redraw of the Figure
 self.fig.canvas.draw()
 FigureCanvas.updateGeometry(self)
#===============================================================================
#
#===============================================================================
class ApplicationWindow(QtGui.QMainWindow):
 """Example main window"""
 def __init__(self):
 # initialization of Qt MainWindow widget
 QtGui.QMainWindow.__init__(self)
 # set window title
 self.setWindowTitle("QHE manip")
 # instantiate a widget, it will be the main one
 self.main_widget = QtGui.QWidget(self)
 # create a vertical box layout widget
 vbl = QtGui.QVBoxLayout(self.main_widget)
 # instantiate our Matplotlib canvas widget
 qmc = CPUMonitor(self.main_widget)
 # instantiate the navigation toolbar
 ntb = NavigationToolbar(qmc, self.main_widget)
 # pack these widget into the vertical box
 vbl.addWidget(qmc)
 vbl.addWidget(ntb)
 # set the focus on the main widget
 self.main_widget.setFocus()
 # set the central widget of MainWindow to main_widget
 self.setCentralWidget(self.main_widget)
# create the GUI application
qApp = QtGui.QApplication(sys.argv)
# instantiate the ApplicationWindow widget
aw = ApplicationWindow()
# show the widget
aw.show()
# start the Qt main loop execution, exiting from this script
# with the same return code of Qt application
sys.exit(qApp.exec_())
And this code doesn't show anything... Somebody understand why?
Thanks,
Fabien
2011年12月4日 David Hoese <dh...@gm...>
>
> I think you forget to set the layout on your central widget.
>
> self.main_widget.setLayout(vbl) # in your case
>
> -Dave
>
> On 12/4/2011 9:57 AM, mat...@li... wrote:
> > 2011年12月2日 Daniel Hyams<dh...@gm...>:
> >> > I don't have PyQt installed, so I couldn't test the code, but don't you want
> >> > to be using "extend" and not "append", if you are returning a list from your
> >> > two get_info() functions?
> >> >
> >> > On Fri, Dec 2, 2011 at 8:13 AM, Fabien Lafont<laf...@gm...>
> >> > wrote:
> >>> >>
> >>> >> Hello everyone, I'm trying to plot live data extracting from remote
> >>> >> devices (here it's simulated by get_info1 and 2 the result is always
> >>> >> 0.8 or 0.9
> >>> >>
> >>> >> I can't understand why it doesnt plot the graph at the end of the
> >>> >> while loop. Does somebody has an idea?
>
> ------------------------------------------------------------------------------
> All the data continuously generated in your IT infrastructure
> contains a definitive record of customers, application performance,
> security threats, fraudulent activity, and more. Splunk takes this
> data and makes sense of it. IT sense. And common sense.
> http://p.sf.net/sfu/splunk-novd2d
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users