matplotlib-users — Discussion related to using matplotlib

Re: [Matplotlib-users] mathtext and fonts under Windows 8

[CAB <ca...@ya...>]

Dear Mike & Paul,
 
Thanks for your replies.  I tried Mike's protocol, and I found that font_manager found the Arial font ("C:\\Windows\\fonts\\Arial.ttf") in the right place.  I don't have fontforge yet, so I guess I need to install and check it out.
 
But the thing that bothers me about this error is that it only occurs if I try to mix mathtext and non-matplotlib font.  So matplotlib finds Arial just fine.  And it finds the mathtext font fine.  Only the mixture is fatal.  It's as if the parser loses track of the Arial font, or it looks for a mathtext glyph in Arial.  Very strange that it occurs only in Windows 8.
 
Regarding Paul's response, I don't have LaTeX on the W8 computer, and my impression is that mathtext doesn't look for "mathematical Arial", instead there are some packaged fonts that it uses for this purpose, like Computer Modern and STIX.  
 
I'll try to hunt this down further, and let you know if I find anything.
 
Best,
Chad


________________________________
From: Michael Droettboom <md...@st...>
To: mat...@li... 
Sent: Thursday, January 10, 2013 7:35 AM
Subject: Re: [Matplotlib-users] mathtext and fonts under Windows 8


Since this is specific to Windows 8, I wonder if the Arial font has been updated in that version.  If it's a newer OTF font, rather than a TTF font, it's possible matplotlib can't read it correctly.

You can see what font file is on each platform by starting up a Python prompt and doing:

  >>> from matplotlib import font_manager
  >>> font_manager.findfont("Arial")

It should display the path to the font.  From that, you should be able to get the Arial file on each of your platforms and see if they are different.  To get more details, you could open them up in the open source "fontforge" tool.  Sorry I can't do this myself, as I don't have access to anything past XP.

If the fonts turn out to be different, as a workaround, you could try backing up and then replacing the Arial font on your Windows 8 machine with the one on your Windows 7 machine.

Cheers,
Mike

On 01/09/2013 11:59 PM, Paul Hobson wrote:

Sounds like it might have something to do with your Latex installation (if any) or the barebones Latex-rendering done by MPL alone. Namely, they simply don't have the characters for mathematical Arial available.  
>
>
>Not too sure though. Hopefully someone more knowledgeable responds.
>-paul 
>
>
>
>On Tue, Jan 8, 2013 at 9:31 PM, CAB <ca...@ya...> wrote:
>
>Hi, All,
>>
>>I am encountering a thorny problem when trying to run matplotlib under Windows 8.  If I label an axis using a command like
>>
>>ax.set_ylabel(r'time (s)', name='Arial'),
>>
>>all is well.  But if  try to add mathtext to that, as in
>>
>>ax.set_ylabel(r'time ($s$)', name='Arial'),
>>
>>mathtext.py throws an error (a very long stream) ending in "RuntimeError: Face has no glyph names".  If I remove the "name='Arial'" above and let the program default to Bitstream Vera Sans, the mathtext works.
>>
>>
>>
>>This problem does not occur under Windows 7 or XP; only under two different Windows 8 installations.  Any ideas what's going on?
>>
>>
>>Chad
>>
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Re: [Matplotlib-users] creating an object oriented matplotlib figure

[Alan G I. <ala...@gm...>]

On 1/16/2013 4:39 AM, Kelson Zawack wrote:
> I want to create a matplotlib figure as part of a program I am writing
> and therefore would like to create the figure in a fully object oriented
> way, ie not in the pyplot state-full way.


Perhaps you will find it useful to look at the TSPlot class at
http://econpy.googlecode.com/svn-history/r175/trunk/abm/gridworld/gridworld.py

Alan Isaac

Re: [Matplotlib-users] creating an object oriented matplotlib figure

[Vlastimil B. <vla...@gm...>]

2013/1/16 Kelson Zawack <kb...@co...>:
> I want to create a matplotlib figure as part of a program I am writing
> and therefore would like to create the figure in a fully object oriented
> way, ie not in the pyplot state-full way.  I understand how to work with
> a figure object to create axes objects and then fill the axes objects
> with primitive artists but I can't figure out what type of object to put
> the figure object in to get it displayed.  From digging around in the
> source it looks like the show() method comes from the backend, but when
> I looked in 'matplotlib/backends/backend_agg' I saw no such object.
> What am I missing?  I guess I could put the figure in a Qt window, but I
> like the functionality provided by the default matplotlib window.
>
> Thanks for the help
>

Hi,
if you need an embedded figure in some gui app (supported with
matplotlib backends),
you may check some demos on this topic:
http://matplotlib.org/examples/user_interfaces/index.html
embedding_in_ ... (gtk, tk, qt, wx)
You can also reuse the gui elements such as toolbar etc.
I have no experience with qt, but apparently, there is an example for this:
http://matplotlib.org/examples/user_interfaces/embedding_in_qt4_wtoolbar.html
Or is it some more specific problem, you are encountering?

hth,
   vbr

Re: [Matplotlib-users] creating an object oriented matplotlib figure

[Kelson Z. <kb...@co...>]

Ok, I understand about agg, but I am still a bit confused.  First when I 
run the suggested code using whatever the default backend is the figure 
is only displayed for a second and then it goes away and the program 
ends.  I guess what I am really interested in is what plt.figure() 
does.  It seems to be creating a figure manager which has a canvas and a 
figure in it, but which one of these is responsible for the 
showing/saving to file?

Thanks for your help


On 1/16/13 5:02 AM, Francesco Montesano wrote:
> Hi Kelson,
>
> 2013/1/16 Kelson Zawack <kb...@co... <mailto:kb...@co...>>
>
>     I want to create a matplotlib figure as part of a program I am writing
>     and therefore would like to create the figure in a fully object
>     oriented
>     way, ie not in the pyplot state-full way.  I understand how to
>     work with
>     a figure object to create axes objects and then fill the axes objects
>     with primitive artists but I can't figure out what type of object
>     to put
>     the figure object in to get it displayed. 
>
> using qt4agg for me this works (version 1.2.0)
> fig = plt.figure()
> ax = fig.add_subplot(111)
> ax.plot([1,2])
> fig.show()
>
>     From digging around in the
>     source it looks like the show() method comes from the backend, but
>     when
>     I looked in 'matplotlib/backends/backend_agg' I saw no such object.
>     What am I missing?  I guess I could put the figure in a Qt window,
>     but I
>     like the functionality provided by the default matplotlib window.
>
>     Thanks for the help
>
>
> "agg" is not an interactive backend and is useful only when saving 
> figures 
> (http://matplotlib.1069221.n5.nabble.com/Backend-Agg-show-plot-td13162.html). 
> Thats why there is no show().
> e.g. qt4agg gets show from qt4
>
> does this help?
>
> Francesco
>
>
>
>     ------------------------------------------------------------------------------
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Re: [Matplotlib-users] creating an object oriented matplotlib figure

[Francesco M. <fra...@gm...>]

Hi Kelson,

2013/1/16 Kelson Zawack <kb...@co...>

> I want to create a matplotlib figure as part of a program I am writing
> and therefore would like to create the figure in a fully object oriented
> way, ie not in the pyplot state-full way.  I understand how to work with
> a figure object to create axes objects and then fill the axes objects
> with primitive artists but I can't figure out what type of object to put
> the figure object in to get it displayed.

using qt4agg for me this works (version 1.2.0)
fig = plt.figure()
ax = fig.add_subplot(111)
ax.plot([1,2])
fig.show()

>From digging around in the
> source it looks like the show() method comes from the backend, but when
> I looked in 'matplotlib/backends/backend_agg' I saw no such object.
> What am I missing?  I guess I could put the figure in a Qt window, but I
> like the functionality provided by the default matplotlib window.
>
> Thanks for the help
>

"agg" is not an interactive backend and is useful only when saving figures (
http://matplotlib.1069221.n5.nabble.com/Backend-Agg-show-plot-td13162.html).
Thats why there is no show().
e.g. qt4agg gets show from qt4

does this help?

Francesco


>
>
>
> ------------------------------------------------------------------------------
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>

[Matplotlib-users] creating an object oriented matplotlib figure

[Kelson Z. <kb...@co...>]

I want to create a matplotlib figure as part of a program I am writing 
and therefore would like to create the figure in a fully object oriented 
way, ie not in the pyplot state-full way.  I understand how to work with 
a figure object to create axes objects and then fill the axes objects 
with primitive artists but I can't figure out what type of object to put 
the figure object in to get it displayed.  From digging around in the 
source it looks like the show() method comes from the backend, but when 
I looked in 'matplotlib/backends/backend_agg' I saw no such object.  
What am I missing?  I guess I could put the figure in a Qt window, but I 
like the functionality provided by the default matplotlib window.

Thanks for the help

Re: [Matplotlib-users] How to start when you don't know what to do

[Oz N. T. <na...@gm...>]

Hi Steven,

First let me say, your question is great. It is humble and great too.
Then, I would say, just do it. Sorry for the cliché, but
programming is a lot of trial and error. If you don't do, you will not make
errors, and you will not learn.

But lucky for you, you live in the age of Internet. So, you have this
list, physics forums, and places like stackoverflow.

Asking the list is not a bad idea. Search isn't also. A lot of times, I started
writing code, and then realized I don't know even how to formulate the
question.
So, I just googled and browsed stackoverflow, until I found a way to
ask the question.

Many times, I realized I already know most of the answer and just
needed a little help.
This help came from the list or from people in stackoverflow (which by
the way rewards
for asking good questions too!  you'd get a lot of upvoted for that).

If you are newbie  - and also if you aren't - and you still don't know
IPython - use
IPython!
It makes the learning curve of Python way smoother. It gives you
documentation in very very
handy way, and pressing TAB [1] shows you what every object can do (in
other words, OO
terminology, which methods the object has).

And finally, be patient. Any significant learning you do, takes time.
Don't expect to do fancy graphs
right away. Man, I had plotted about 120 alone in my master thesis.
Luckily, I already trained during
my courses before, although the assignments were supposed to be done
in Matlab (yuck!), I insisted doing
everything in Python two. And you know what? 2 years later when I look
at my codes written back
then, I think "eww... I could that better, and this too!". It will
happen to you too.
You will start awkward, not sure, with many ugly hacks. And then
suddenly, after 1-2 years, you will
realize you speak Python, and you know how to read the very good
documentation of matplotlib.
It will happen to you too.

I am also adding a link to a nice blog I follow about numpy and matplotlib:

http://glowingpython.blogspot.com

Good luck, and enjoy the journey.

Oz

[1]  this feature is also available also in a normal Python session
under certain conditions ...

Re: [Matplotlib-users] "Sorry, could not import Basemap" in http://matplotlib.org/users/screenshots.html

[Michael D. <md...@st...>]

Thanks.  It should be restored momentarily when github fetches the new 
revision of the docs.

Mike

On 01/15/2013 11:52 AM, Alejandro Weinstein wrote:
> Hi:
>
> I just want to report that in the screenshots section of the website
> (http://matplotlib.org/users/screenshots.html), in the Basemap demo
> (http://matplotlib.org/users/screenshots.html#basemap-demo) section,
> instead of the plot there is a message saying "Sorry, could not import
> Basemap".
>
> Alejandro.
>
> ------------------------------------------------------------------------------
> Master SQL Server Development, Administration, T-SQL, SSAS, SSIS, SSRS
> and more. Get SQL Server skills now (including 2012) with LearnDevNow -
> 200+ hours of step-by-step video tutorials by Microsoft MVPs and experts.
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Re: [Matplotlib-users] How to start when you don't know what to do

[Oliver K. <oli...@gm...>]

Hi Steven,

I first look at what types of plots and axes are available out-of-the-box. The gallery and examples sections of the matplotlib webpage are good places to get ideas about what is possible when programming in this mode. 

If there isn't an existing axis type which works, I take one of two approaches. If it is a type of plot which I will be making many times, I try to make my own type of axis / projection: see http://matplotlib.org/examples/axes_grid/demo_floating_axes.html for an example of what I mean.

If I'm simply trying to reproduce a graphic only once, I will generally fudge it by drawing a bunch of Collections (usually a PolyCollection or LineCollection, http://matplotlib.org/api/collections_api.html) on a normal cartesian axis, and then hide the axes, ticks and ticklabels.

This approach works for me, though your mileage may vary.

Cheers.
Oliver

On Jan 15, 2013, at 11:52 AM, Steven Boada wrote:

> Heyya list.
> 
> I must admit that my matplotlib-foo is only so so. One of the biggest 
> problems that I face is seeing cool stuff around the net, and thinking, 
> "that's pretty neat, I'd like to copy it." In reality, I have no idea 
> how I would go about creating something like that.
> 
> Here's an example: http://imgur.com/JdkR4
> 
> Just a little circular histogram thing with some annotations. Obviously, 
> I'd need the annotate command for the words, but what about the arcs? No 
> idea, off hand. So my question is, how do you decode (read: what to 
> think about) figures that you see, and turn them into actual python? 
> Sure I could post on stack exchange or email all you people every time, 
> but I want to be *better* at this. And while some people are going to 
> scoff and reply "that's easy, silly" it's not so for some. I just hate 
> to admit it's me.
> 
> Thanks for the advice.
> 
> -- 
> 
> Steven Boada
> 
> Doctoral Student
> Dept of Physics and Astronomy
> Texas A&M University
> bo...@ph...
> 
> 
> ------------------------------------------------------------------------------
> Master SQL Server Development, Administration, T-SQL, SSAS, SSIS, SSRS
> and more. Get SQL Server skills now (including 2012) with LearnDevNow -
> 200+ hours of step-by-step video tutorials by Microsoft MVPs and experts.
> SALE $99.99 this month only - learn more at:
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Re: [Matplotlib-users] How to start when you don't know what to do

[Paul H. <pmh...@gm...>]

On Jan 15, 2013, at 20:52 , Steven Boada wrote:

>
> > Heyya list.
> >
> > I must admit that my matplotlib-foo is only so so. One of the biggest
> > problems that I face is seeing cool stuff around the net, and thinking,
> > "that's pretty neat, I'd like to copy it." In reality, I have no idea
> > how I would go about creating something like that.
> >
> > Here's an example: http://imgur.com/JdkR4
> >
> > Just a little circular histogram thing with some annotations. Obviously,
> > I'd need the annotate command for the words, but what about the arcs? No
> > idea, off hand. So my question is, how do you decode (read: what to
> > think about) figures that you see, and turn them into actual python?
> > Sure I could post on stack exchange or email all you people every time,
> > but I want to be *better* at this. And while some people are going to
> > scoff and reply "that's easy, silly" it's not so for some. I just hate
> > to admit it's me.
> >
> > Thanks for the advice.
>


On Tue, Jan 15, 2013 at 12:09 PM, Nicolas Rougier <Nic...@in...>
 wrote:

>
>
> I do exactly that from time to time (copying a graphic) and I always start
> looking at the matplotlib gallery (http://matplotlib.org/gallery.html)
> for what is the most similar figure and starts from here (after removing
> what is not necessary). Most important is identifying the kind of axis
> necessary (cartesian, log, polar, ...)
>
> Some examples at: http://www.loria.fr/~rougier/coding/gallery/
>
> Some really nice graphics (but difficult) to try to copy at:
>
> http://www.improving-visualisation.org/visuals


Agreed. In this particular case, you want a bar plot on a polar axis like
this:
http://matplotlib.org/examples/pylab_examples/polar_bar.html

Pay extra attention to the `bottom` and `width` keyword arguments.
-paul

Re: [Matplotlib-users] How to start when you don't know what to do

[Andrew S. <and...@gm...>]

Do you happen to have a really good programmer nearby? I usually do a ton
of dumb trial and error for a week, banging my head against the wall, until
my super good programmer colleague comes over and goes "goddammit what are
you trying to do?", then in like 2 minutes he shows me where I went wrong.
But I find that I learn the most after a lot of dumb trial and error, then
someone who knows what they are doing shows me.




On Tue, Jan 15, 2013 at 2:09 PM, Nicolas Rougier
<Nic...@in...>wrote:

>
>
> I do exactly that from time to time (copying a graphic) and I always start
> looking at the matplotlib gallery (http://matplotlib.org/gallery.html)
> for what is the most similar figure and starts from here (after removing
> what is not necessary). Most important is identifying the kind of axis
> necessary (cartesian, log, polar, ...)
>
> Some examples at: http://www.loria.fr/~rougier/coding/gallery/
>
> Some really nice graphics (but difficult) to try to copy at:
>
> http://www.improving-visualisation.org/visuals
>
>
>
> Nicolas
>
>
> On Jan 15, 2013, at 20:52 , Steven Boada wrote:
>
> > Heyya list.
> >
> > I must admit that my matplotlib-foo is only so so. One of the biggest
> > problems that I face is seeing cool stuff around the net, and thinking,
> > "that's pretty neat, I'd like to copy it." In reality, I have no idea
> > how I would go about creating something like that.
> >
> > Here's an example: http://imgur.com/JdkR4
> >
> > Just a little circular histogram thing with some annotations. Obviously,
> > I'd need the annotate command for the words, but what about the arcs? No
> > idea, off hand. So my question is, how do you decode (read: what to
> > think about) figures that you see, and turn them into actual python?
> > Sure I could post on stack exchange or email all you people every time,
> > but I want to be *better* at this. And while some people are going to
> > scoff and reply "that's easy, silly" it's not so for some. I just hate
> > to admit it's me.
> >
> > Thanks for the advice.
> >
> > --
> >
> > Steven Boada
> >
> > Doctoral Student
> > Dept of Physics and Astronomy
> > Texas A&M University
> > bo...@ph...
> >
> >
> >
> ------------------------------------------------------------------------------
> > Master SQL Server Development, Administration, T-SQL, SSAS, SSIS, SSRS
> > and more. Get SQL Server skills now (including 2012) with LearnDevNow -
> > 200+ hours of step-by-step video tutorials by Microsoft MVPs and experts.
> > SALE $99.99 this month only - learn more at:
> > http://p.sf.net/sfu/learnmore_122512
> > _______________________________________________
> > Matplotlib-users mailing list
> > Mat...@li...
> > https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
>
>
> ------------------------------------------------------------------------------
> Master SQL Server Development, Administration, T-SQL, SSAS, SSIS, SSRS
> and more. Get SQL Server skills now (including 2012) with LearnDevNow -
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Re: [Matplotlib-users] How to start when you don't know what to do

[Nicolas R. <Nic...@in...>]

I do exactly that from time to time (copying a graphic) and I always start looking at the matplotlib gallery (http://matplotlib.org/gallery.html) for what is the most similar figure and starts from here (after removing what is not necessary). Most important is identifying the kind of axis necessary (cartesian, log, polar, ...)

Some examples at: http://www.loria.fr/~rougier/coding/gallery/

Some really nice graphics (but difficult) to try to copy at:

http://www.improving-visualisation.org/visuals



Nicolas


On Jan 15, 2013, at 20:52 , Steven Boada wrote:

> Heyya list.
> 
> I must admit that my matplotlib-foo is only so so. One of the biggest 
> problems that I face is seeing cool stuff around the net, and thinking, 
> "that's pretty neat, I'd like to copy it." In reality, I have no idea 
> how I would go about creating something like that.
> 
> Here's an example: http://imgur.com/JdkR4
> 
> Just a little circular histogram thing with some annotations. Obviously, 
> I'd need the annotate command for the words, but what about the arcs? No 
> idea, off hand. So my question is, how do you decode (read: what to 
> think about) figures that you see, and turn them into actual python? 
> Sure I could post on stack exchange or email all you people every time, 
> but I want to be *better* at this. And while some people are going to 
> scoff and reply "that's easy, silly" it's not so for some. I just hate 
> to admit it's me.
> 
> Thanks for the advice.
> 
> -- 
> 
> Steven Boada
> 
> Doctoral Student
> Dept of Physics and Astronomy
> Texas A&M University
> bo...@ph...
> 
> 
> ------------------------------------------------------------------------------
> Master SQL Server Development, Administration, T-SQL, SSAS, SSIS, SSRS
> and more. Get SQL Server skills now (including 2012) with LearnDevNow -
> 200+ hours of step-by-step video tutorials by Microsoft MVPs and experts.
> SALE $99.99 this month only - learn more at:
> http://p.sf.net/sfu/learnmore_122512
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users

[Matplotlib-users] How to start when you don't know what to do

[Steven B. <bo...@ph...>]

Heyya list.

I must admit that my matplotlib-foo is only so so. One of the biggest 
problems that I face is seeing cool stuff around the net, and thinking, 
"that's pretty neat, I'd like to copy it." In reality, I have no idea 
how I would go about creating something like that.

Here's an example: http://imgur.com/JdkR4

Just a little circular histogram thing with some annotations. Obviously, 
I'd need the annotate command for the words, but what about the arcs? No 
idea, off hand. So my question is, how do you decode (read: what to 
think about) figures that you see, and turn them into actual python? 
Sure I could post on stack exchange or email all you people every time, 
but I want to be *better* at this. And while some people are going to 
scoff and reply "that's easy, silly" it's not so for some. I just hate 
to admit it's me.

Thanks for the advice.

-- 

Steven Boada

Doctoral Student
Dept of Physics and Astronomy
Texas A&M University
bo...@ph...

[Matplotlib-users] "Sorry, could not import Basemap" in http://matplotlib.org/users/screenshots.html

[Alejandro W. <ale...@gm...>]

Hi:

I just want to report that in the screenshots section of the website
(http://matplotlib.org/users/screenshots.html), in the Basemap demo
(http://matplotlib.org/users/screenshots.html#basemap-demo) section,
instead of the plot there is a message saying "Sorry, could not import
Basemap".

Alejandro.

Re: [Matplotlib-users] Clipped colorbar values in matshow

[Alejandro W. <ale...@gm...>]

On Mon, Jan 14, 2013 at 10:39 AM, Paul Hobson <pmh...@gm...> wrote:
> Does the call to tight_layout() fig your problem?

Actually, I just realized that is not tight_layout() what fixed my
problem, but using ax.matshow instead of plt.matshow. The following
code produces an unclipped colorbar:

A = np.random.rand(100,10) / 100
fig, ax = plt.subplots()
img = ax.matshow(A)
plt.colorbar(img)
plt.show()


Alejandro.

Re: [Matplotlib-users] Clipped colorbar values in matshow

[Paul H. <pmh...@gm...>]

On Mon, Jan 14, 2013 at 8:50 AM, Alejandro Weinstein <
ale...@gm...> wrote:

> On Mon, Jan 14, 2013 at 9:42 AM, Paul Hobson <pmh...@gm...> wrote:
> > import matplotlib.pyplot as plt
> > import numpy as np
> >
> > A = np.random.rand(100,10) / 100
> > fig, ax = plt.subplots()
> > img = ax.matshow(A)
> > plt.colorbar(img)
> > fig.tight_layout()
> > plt.show()
> >
> > Does the call to tight_layout() fig your problem?
>
> Yes. This shows all the digits. There is still a lot of empty space to
> the left of the image, but that's not too bad.
>
> Interestingly, I tried before using tight_layout() as in
>
> ##################################
> A = np.random.rand(100,10) / 100
> plt.matshow(A)
> plt.colorbar()
> plt.tight_layout()
> plt.show()
> ##################################
>
> and I got the error
>
>
> /usr/local/lib/python2.7/dist-packages/matplotlib-1.3.x-py2.7-linux-x86_64.egg/matplotlib/figure.py:1526:
> UserWarning: This figure includes Axes that are not compatible with
> tight_layout, so its results might be incorrect.
>   warnings.warn("This figure includes Axes that are not "
> Traceback (most recent call last):
>   File "mp1.py", line 8, in <module>
>     plt.tight_layout()
>   File
> "/usr/local/lib/python2.7/dist-packages/matplotlib-1.3.x-py2.7-linux-x86_64.egg/matplotlib/pyplot.py",
> line 1150, in tight_layout
>     fig.tight_layout(pad=pad, h_pad=h_pad, w_pad=w_pad, rect=rect)
>   File
> "/usr/local/lib/python2.7/dist-packages/matplotlib-1.3.x-py2.7-linux-x86_64.egg/matplotlib/figure.py",
> line 1536, in tight_layout
>     rect=rect)
>   File
> "/usr/local/lib/python2.7/dist-packages/matplotlib-1.3.x-py2.7-linux-x86_64.egg/matplotlib/tight_layout.py",
> line 325, in get_tight_layout_figure
>     max_nrows = max(nrows_list)
> ValueError: max() arg is an empty sequence
>

(Some of the discussion accidentally went off-list. Sorry that was my
fault.)

Same here on my Windows machine. --That-- might be bug. I'll wait for some
feedback before I create a github issue.
-paul

[Matplotlib-users] Clipped colorbar values in matshow

[Alejandro W. <ale...@gm...>]

Hi:

I'm using matshow with a colorbar to visualize a matrix. If the number
of digits used in the colorbar are too many, the digits are clipped.

The following code illustrates the behavior:

##################################
import matplotlib.pyplot as plt
import numpy as np

A = np.random.rand(100,10) / 100
plt.matshow(A)
plt.colorbar()
plt.show()
##################################

See http://imgur.com/AJmv0 for the output.

Is there an easy way to get the colormap without clipping? I can
resize the image manually to get all the digits, but I'm looking for
an automatic way to do this.

Should I report this as a bug?

I'm using mpl 1.3

Alejandro.

Re: [Matplotlib-users] mathtext and fonts under Windows 8

[Daniel H. <dh...@gm...>]

For what it's worth, I checked this out on my Windows 8 machine and
didn't have any problems.

On Thu, Jan 10, 2013 at 8:35 AM, Michael Droettboom <md...@st...> wrote:
> Since this is specific to Windows 8, I wonder if the Arial font has been
> updated in that version.  If it's a newer OTF font, rather than a TTF font,
> it's possible matplotlib can't read it correctly.
>
> You can see what font file is on each platform by starting up a Python
> prompt and doing:
>
>   >>> from matplotlib import font_manager
>   >>> font_manager.findfont("Arial")
>
> It should display the path to the font.  From that, you should be able to
> get the Arial file on each of your platforms and see if they are different.
> To get more details, you could open them up in the open source "fontforge"
> tool.  Sorry I can't do this myself, as I don't have access to anything past
> XP.
>
> If the fonts turn out to be different, as a workaround, you could try
> backing up and then replacing the Arial font on your Windows 8 machine with
> the one on your Windows 7 machine.
>
> Cheers,
> Mike
>
> On 01/09/2013 11:59 PM, Paul Hobson wrote:
>
> Sounds like it might have something to do with your Latex installation (if
> any) or the barebones Latex-rendering done by MPL alone. Namely, they simply
> don't have the characters for mathematical Arial available.
>
> Not too sure though. Hopefully someone more knowledgeable responds.
> -paul
>
>
> On Tue, Jan 8, 2013 at 9:31 PM, CAB <ca...@ya...> wrote:
>>
>> Hi, All,
>>
>> I am encountering a thorny problem when trying to run matplotlib under
>> Windows 8.  If I label an axis using a command like
>>
>> ax.set_ylabel(r'time (s)', name='Arial'),
>>
>> all is well.  But if  try to add mathtext to that, as in
>>
>> ax.set_ylabel(r'time ($s$)', name='Arial'),
>>
>> mathtext.py throws an error (a very long stream) ending in "RuntimeError:
>> Face has no glyph names".  If I remove the "name='Arial'" above and let the
>> program default to Bitstream Vera Sans, the mathtext works.
>>
>> This problem does not occur under Windows 7 or XP; only under two
>> different Windows 8 installations.  Any ideas what's going on?
>>
>> Chad
>>
>>
>> ------------------------------------------------------------------------------
>> Master Java SE, Java EE, Eclipse, Spring, Hibernate, JavaScript, jQuery
>> and much more. Keep your Java skills current with LearnJavaNow -
>> 200+ hours of step-by-step video tutorials by Java experts.
>> SALE $49.99 this month only -- learn more at:
>> http://p.sf.net/sfu/learnmore_122612
>> _______________________________________________
>> Matplotlib-users mailing list
>> Mat...@li...
>> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>>
>
>
>
> ------------------------------------------------------------------------------
> Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS,
> MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current
> with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft
> MVPs and experts. ON SALE this month only -- learn more at:
> http://p.sf.net/sfu/learnmore_122712
>
>
>
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
>
>
> ------------------------------------------------------------------------------
> Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS,
> MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current
> with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft
> MVPs and experts. ON SALE this month only -- learn more at:
> http://p.sf.net/sfu/learnmore_122712
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>



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

Re: [Matplotlib-users] Building 1.2.0 with Python 3.3 on Windows (MinGW)

[klo <kl...@gm...>]

I found this: https://github.com/cournape/matplotlib-dependencies

but what should I do with it?
Should I try to compile or put it in some folder?
How to instruct matplotlib to use those?
site.cfg template doesn't have any entry for each of above packages.

Re: [Matplotlib-users] Building 1.2.0 with Python 3.3 on Windows (MinGW)

[klo <kl...@gm...>]

Some more info I think I should have posted:

============================================================================
BUILDING MATPLOTLIB
            matplotlib: 1.2.0
                python: 3.3.0 (v3.3.0:bd8afb90ebf2, Sep 29 2012, 10:55:48)
                        [MSC v.1600 32 bit (Intel)]
              platform: win32
       Windows version: sys.getwindowsversion(major=5, minor=1, build=2600,
                        platform=2, service_pack='Service Pack 3')

REQUIRED DEPENDENCIES
                 numpy: 1.7.0rc1
             freetype2: found, but unknown version (no pkg-config)
                        * WARNING: Could not find 'freetype2' headers in any
                        * of 'win32_static\include', '.',
                        * 'win32_static\include\freetype2', '.\freetype2'.

OPTIONAL BACKEND DEPENDENCIES
                libpng: found, but unknown version (no pkg-config)
                        * Could not find 'libpng' headers in any of
                        * 'win32_static\include', '.'
               Tkinter: no
                        * Tkinter present, but header files are not found.
                        * You may need to install development packages.
                  Gtk+: no
                        * Building for Gtk+ requires pygtk; you must be able
                        * to "import gtk" in your build/install environment
       Mac OS X native: no
                    Qt: no
                   Qt4: Qt: 4.8.4, PyQt4: 4.9.6
                PySide: no
                 Cairo: no

OPTIONAL DATE/TIMEZONE DEPENDENCIES
              dateutil: matplotlib will provide
                  pytz: matplotlib will provide
                   six: matplotlib will provide

OPTIONAL USETEX DEPENDENCIES
                dvipng: 1.12
           ghostscript: 9.06
                 latex: MiKTeX 2.9

[Edit setup.cfg to suppress the above messages]
============================================================================


Friday, January 11, 2013, 2:03:51 PM, you wrote:

> `python3 setup.py build` fails with this error:

> ========================================
> ...

> running build_ext
> building 'matplotlib.ft2font' extension
> creating build\temp.win32-3.3
> creating build\temp.win32-3.3\Release
> creating build\temp.win32-3.3\Release\src
> creating build\temp.win32-3.3\Release\cxx
> C:\MinGW\bin\gcc.exe -mdll -O -Wall
> -DPY_ARRAY_UNIQUE_SYMBOL=MPL_ARRAY_API -DPYCXX_ISO_CPP_LIB=1
> -DPYCXX_PYTHON_2TO3=1 -Iwin32_static\include
> -Ic:\python33\lib\site-packages\numpy\core\include -I.
> -Iwin32_static\include\freetype2
> -Ic:\python33\lib\site-packages\numpy\core\include\freetype2
> -I.\freetype2 -Ic:\python33\include -Ic:\python33\include -c
> src/ft2font.cpp -o build\temp.win32-3.3\Release\src\ft2font.o
> In file included from src/ft2font.cpp:3:0:
> src/ft2font.h:16:22: fatal error: ft2build.h: No such file or directory
> compilation terminated.
> error: command 'gcc' failed with exit status 1
> ========================================

> It seems like it looks for freetype header file.
> How to supply this?

[Matplotlib-users] Building 1.2.0 with Python 3.3 on Windows (MinGW)

[klo <kl...@gm...>]

`python3 setup.py build` fails with this error:

========================================
...

running build_ext
building 'matplotlib.ft2font' extension
creating build\temp.win32-3.3
creating build\temp.win32-3.3\Release
creating build\temp.win32-3.3\Release\src
creating build\temp.win32-3.3\Release\cxx
C:\MinGW\bin\gcc.exe -mdll -O -Wall -DPY_ARRAY_UNIQUE_SYMBOL=MPL_ARRAY_API -DPYCXX_ISO_CPP_LIB=1 -DPYCXX_PYTHON_2TO3=1 -Iwin32_static\include -Ic:\python33\lib\site-packages\numpy\core\include -I. -Iwin32_static\include\freetype2 -Ic:\python33\lib\site-packages\numpy\core\include\freetype2 -I.\freetype2 -Ic:\python33\include -Ic:\python33\include -c src/ft2font.cpp -o build\temp.win32-3.3\Release\src\ft2font.o
In file included from src/ft2font.cpp:3:0:
src/ft2font.h:16:22: fatal error: ft2build.h: No such file or directory
compilation terminated.
error: command 'gcc' failed with exit status 1
========================================

It seems like it looks for freetype header file.
How to supply this?

Thanks

[Matplotlib-users] Render canvas object (figure) to html files(templates) in Django.

[Navid S. <sha...@gm...>]

Hi  all,

I am using matplotlib with Django.
I want to display figures processed in Django apps by matplotlib in browser
using html5.

I tried:

*def plot_file(request):*
*    import matplotlib.cbook as cbook*
*    fig = figure()*
*    fname = cbook.get_sample_data('msft.csv', asfileobj=False)*
*    plotfile(fname, (0,1,2,3))*
*
*
*    canvas = FigureCanvas(fig)*
*    response = HttpResponse(content_type="image/png")*
*    canvas.print_png(response)*
*    fig.clear()*
*    return response*

This response takes whole page and displays figure.
I have other contents as well to display along with figure.

How can I send it as a canvas object or something else(I am unaware of) in
order to have print logic in html file(django templates)
in order to position figure as my requirement:

I thought of something like this, but not sure:

*def plot_file(request):*
*    ---------------*
*    ---------------*
*    return render_to_response('template.html',{*
*        'canvas':canvas,*
*    },  *
*    context_instance=RequestContext(request),*
*    )   *
-------------------------------------------------------------------------------------------------------------------------
Please make me inform, If I need to provide more context.

Regards,
Navid Shaikh.

[Matplotlib-users] Pick PathCollection component by interior

[Brendan B. <bre...@br...>]

	I have a PathCollection with a lot of closed paths.  I'm trying to 
implement a "data cursor" as described here: 
http://stackoverflow.com/questions/4652439/is-there-a-matplotlib-equivalent-of-matlabs-datacursormode 
.  I've done this successfuly in the past when the objects I wanted to 
pick were points.  However, with this PathCollection, I want to be 
able to click inside the region enclosed by a path, and select the 
path that encloses that region.  Using the basic sort of code as shown 
in that post, it seems to only select the path when you click on the 
path itself --- that is, the boundary of the region.

	How can I get a pick event for a PathCollection that tells me the 
path whose interior I clicked in?  To make things even more 
complicated, some of the paths are not simply-connected and contain 
other paths inside their "holes", but even handling it without that 
wrinkle would be a start.

Thanks,
-- 
Brendan Barnwell
"Do not follow where the path may lead.  Go, instead, where there is 
no path, and leave a trail."
    --author unknown

Re: [Matplotlib-users] Incorrect ylabel placement in twinx

[Goyo <goy...@gm...>]

2013/1/9 Goyo <goy...@gm...>:
> I'm using matplotlib master from
> https://launchpad.net/%7Etakluyver/+archive/matplotlib-daily, ubuntu
> 12.10 and python 2.7 and sometimes I get misplaced y labels for twinx
> plots. I file a bug at github with a sample script and figure images:
> https://github.com/matplotlib/matplotlib/issues/1608
> A guy commented there saying he can't replicate the issue. I wonder if
> anyone using ubuntu 12.10 can try my code with the matplotlib version
> from that repo and share the output.
>

Follow up: there's a PR for an older bug which works for me:
https://github.com/matplotlib/matplotlib/issues/1608#issuecomment-12071708

Re: [Matplotlib-users] mathtext and fonts under Windows 8

[Michael D. <md...@st...>]

Since this is specific to Windows 8, I wonder if the Arial font has been 
updated in that version.  If it's a newer OTF font, rather than a TTF 
font, it's possible matplotlib can't read it correctly.

You can see what font file is on each platform by starting up a Python 
prompt and doing:

   >>> from matplotlib import font_manager
   >>> font_manager.findfont("Arial")

It should display the path to the font.  From that, you should be able 
to get the Arial file on each of your platforms and see if they are 
different.  To get more details, you could open them up in the open 
source "fontforge" tool.  Sorry I can't do this myself, as I don't have 
access to anything past XP.

If the fonts turn out to be different, as a workaround, you could try 
backing up and then replacing the Arial font on your Windows 8 machine 
with the one on your Windows 7 machine.

Cheers,
Mike

On 01/09/2013 11:59 PM, Paul Hobson wrote:
> Sounds like it might have something to do with your Latex installation 
> (if any) or the barebones Latex-rendering done by MPL alone. Namely, 
> they simply don't have the characters for mathematical Arial available.
>
> Not too sure though. Hopefully someone more knowledgeable responds.
> -paul
>
>
> On Tue, Jan 8, 2013 at 9:31 PM, CAB <ca...@ya... 
> <mailto:ca...@ya...>> wrote:
>
>     Hi, All,
>
>     I am encountering a thorny problem when trying to run matplotlib
>     under Windows 8.  If I label an axis using a command like
>
>     ax.set_ylabel(r'time (s)', name='Arial'),
>
>     all is well.  But if  try to add mathtext to that, as in
>
>     ax.set_ylabel(r'time ($s$)', name='Arial'),
>
>     mathtext.py throws an error (a very long stream) ending in
>     "RuntimeError: Face has no glyph names".  If I remove the
>     "name='Arial'" above and let the program default to Bitstream Vera
>     Sans, the mathtext works.
>
>     This problem does not occur under Windows 7 or XP; only under two
>     different Windows 8 installations.  Any ideas what's going on?
>
>     Chad
>
>     ------------------------------------------------------------------------------
>     Master Java SE, Java EE, Eclipse, Spring, Hibernate, JavaScript,
>     jQuery
>     and much more. Keep your Java skills current with LearnJavaNow -
>     200+ hours of step-by-step video tutorials by Java experts.
>     SALE $49.99 this month only -- learn more at:
>     http://p.sf.net/sfu/learnmore_122612
>     _______________________________________________
>     Matplotlib-users mailing list
>     Mat...@li...
>     <mailto:Mat...@li...>
>     https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
>
>
>
> ------------------------------------------------------------------------------
> Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS,
> MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current
> with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft
> MVPs and experts. ON SALE this month only -- learn more at:
> http://p.sf.net/sfu/learnmore_122712
>
>
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users