matplotlib-users Mailing List for matplotlib

2010/8/25 Jeff Whitaker <js...@fa...>:
> gcc-4.2 is the default compiler for 10.6 - I wonder if you need to
> upgrade your dev tools?  Xcode 3.2.2 is available for download (free
> with registration) from Apple.

No, he's using Python.org Python I believe, and that was compiled with
gcc-4.0.  So distutils picks up gcc-4.0, and that is correct.

Joses,
can you give some more lines of the output, or post the complete log
in some pastebin?  Please give the output starting from the offending
gcc call at least.

I just do not recall atm what the problem is people have when coming
with this issue, so please help me a little ;-)

python setup.py build (or install) is a good approach, it gives you
more control than make.osx.  Be aware of that nevertheless the
official approach others on this list will recommend seems to be
make.osx (sorry John), and most people use that.  But make.osx afaik
**installs libraries in your /usr/local directory without asking you
if you want that**, if you do not take special care before (John,
please correct me if I'm wrong here!  But it is what I remember from
my glimpse into make.osx).  Bear that in mind.  I believe it's better
to compile the libs (like freetype and pnglib) yourself where you know
what you're doing.

So, have you compiled at all and if yes using which compiler freetype2
and libpng 1.4?  The records of this list are outdated in that respect
that *no* additional tuning is necessary with mpl 1.0 now to use
libpng 1.4 instead of the older 1.2.

When mpl setup.py starts there is a section between ====== lines, can
you please post also that.

Ah, and for sure you should modify your setupext.py, search for
'darwin' and add in the dictionary entry you will find, '/usr/local'
to the list of the dict value for the key 'darwin'.  Then the libs
installed will be found.  Before this is unlikely.

Friedrich

Friends,

1) I want to remove the rectangular box around the legend. How to do the
same. I apologize if this query had been asked before.

2) reduce the distance (vertical) between two legends in the same plot.

Thanks,
Bala

On Wed, Aug 25, 2010 at 4:53 AM, xyz <mi...@op...> wrote:

> Thank you, but why the coordinates start from 2 and not from 0 with the
> following code?
>
> from pylab import *
> import matplotlib.pyplot as plt
>
> fig = plt.figure()
> ax = fig.add_subplot(111)
>
> for i in [[2,2], [2,3], [4.2,3.5]]:
>   print i[0],i[1]
>   plt.plot(i[0],i[1],'o')
>
> ax.grid(True)
> plt.legend(['Model length', 'Data length', 'test'],
>             'best', shadow=True, fancybox=True)
>
> plt.show()
>
> How is it possible that the coordinates start from 0?
>
>
>
I believe you are asking why the x axis starts at 2?  This is because
matplotlib will automatically set the limits of your plot to show all of
your data.  If you can control the axes yourself by calling set_xlim()
and/or set_ylim().

ax.set_xlim(0.0, 5.0)

would set the limits of your x axis to 0.0 and 5.0.  You can also do

ax.set_xlim(left=0.0)

to control only the left end of the axis (letting the right end be
automatically set).

I hope that helps!
Ben Root

On Tue, Aug 24, 2010 at 10:28 PM, David Pine <dj...@gm...> wrote:

> I am trying to save the frames from a matplotlib animation and I have a
> question that is undoubtedly based on a profound lack of understanding about
> how matplotlib/python works, but I'm hoping someone can offer me an
> explanation.  The following code is excerpted from the animation examples
> "animation_blit_wx.py".  The example works fine unless I include the #*****
> line meant to record the animations in included.  If the line is included,
> the animated line is no longer drawn to the screen or to the sequence of
> plots I am trying to save.  That is, the background is displayed and saved,
> but not the animated line.  Why?
>
>
> def update_line(*args):
>    global blit_time
>
>    if update_line.background is None:
>        update_line.background = canvas.copy_from_bbox(ax.bbox)
>
>    # restore the clean slate background
>    canvas.restore_region(update_line.background)
>    # update the data
>    line.set_ydata(npy.sin(x+update_line.cnt/10.0))
>    # just draw the animated artist
>    ax.draw_artist(line)
>    # just redraw the axes rectangle
>
>    t = time.time()
>    canvas.blit(ax.bbox)
>    blit_time += time.time() - t
>    #***** plt.savefig('f' + str(update_line.cnt) + '.png') *****
>
>    if update_line.cnt == NBLITS:
>        # print the timing info and quit
>        frame_time = time.time() - tstart
>        print '%d frames: %.2f seconds' % (NBLITS, frame_time)
>        print '%d blits:  %.2f seconds' % (NBLITS, blit_time)
>        print
>        print 'FPS: %.2f' % (NBLITS/frame_time)
>        print 'BPS: %.2f' % (NBLITS/blit_time)
>        sys.exit()
>
>    update_line.cnt += 1
>    wx.WakeUpIdle()
>
>
>
Technically speaking, animation to the screen is completely different from
what you are trying to do here.  When showing an animation to the screen, a
bunch of tricks are needed to make it efficient and for looping.  However,
if you only wish to save the individual frames, I would suggest that you
just simply create your figures normally (none of this blitting and
update_lines stuff) and save each of them as you would normally. Be sure to
call clf() to prevent memory usage to grow out of control.

Persoanlly, I then use ImageMagick to merge the image files together into an
animated gif:

convert `ls -1 *.png | sort -d` -set delay 40 -set dispose none -loop 0
animation.gif

The experimental Animation module will have some preliminary support for
saving animations (that feature isn't cross-platform right now).

Ben Root

  On 8/25/10 3:53 AM, Joses Ho wrote:
> Hi,
>
> I run Mac OS X 10.6.4 with the official Python 2.6.3 distribution. I have already installed NumPy ver 1.4.1.
>
> I downloaded and unzipped the matplotlib-1.0.0.tar.gz from the SourceForge site.
>
> When I enter the command :
> python setup.py install
>
> It finally gives me the following error right at the end of a huge chunk of output:
>
> lipo: can't figure out the architecture type of: /var/folders/mC/mC4L2rRBGEChqn7bv1iNd++++TI/-Tmp-//cc0Tc9za.out
> error: command 'gcc-4.0' failed with exit status 1
>
> Any help here would be much appreciated.
>
> Thanks,
> Joses
Joses:

gcc-4.2 is the default compiler for 10.6 - I wonder if you need to 
upgrade your dev tools?  Xcode 3.2.2 is available for download (free 
with registration) from Apple.

-Jeff

-- 
Jeffrey S. Whitaker         Phone  : (303)497-6313
Meteorologist               FAX    : (303)497-6449
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Boulder, CO, USA 80303-3328 Web    : http://tinyurl.com/5telg

Hi,

I run Mac OS X 10.6.4 with the official Python 2.6.3 distribution. I have already installed NumPy ver 1.4.1.

I downloaded and unzipped the matplotlib-1.0.0.tar.gz from the SourceForge site.

When I enter the command :
python setup.py install

It finally gives me the following error right at the end of a huge chunk of output:

lipo: can't figure out the architecture type of: /var/folders/mC/mC4L2rRBGEChqn7bv1iNd++++TI/-Tmp-//cc0Tc9za.out
error: command 'gcc-4.0' failed with exit status 1

Any help here would be much appreciated.

Thanks,
Joses

Thank you, but why the coordinates start from 2 and not from 0 with the 
following code?

from pylab import *
import matplotlib.pyplot as plt

fig = plt.figure()
ax = fig.add_subplot(111)

for i in [[2,2], [2,3], [4.2,3.5]]:
   print i[0],i[1]
   plt.plot(i[0],i[1],'o')

ax.grid(True)
plt.legend(['Model length', 'Data length', 'test'],
            'best', shadow=True, fancybox=True)

plt.show()

How is it possible that the coordinates start from 0?


On 24/08/10 22:43, Michael Droettboom wrote:
> You have plotted three lines, but only provided legend labels for two of
> them.  Try:
>
> plt.legend(('Model length', 'Data length', 'Something else'),
>               'best', shadow=True, fancybox=True)
>
>
> Mike
>
> On 08/24/2010 06:33 AM, xyz wrote:
>    
>> Hello,
>> the following script creates a legend for only two instead of three
>> datasets.
>> -----------
>> from pylab import *
>> import matplotlib.pyplot as plt
>>
>> fig = plt.figure()
>> ax = fig.add_subplot(111)
>>
>> for i in [[2,2], [2,3], [4.2,3.5]]:
>>      print i[0],i[1]
>>      plt.plot(i[0],i[1],'o')
>>
>> ax.grid(True)
>> plt.legend(('Model length', 'Data length'),
>>               'best', shadow=True, fancybox=True)
>>
>> plt.show()
>> -----------------
>>
>> What did I wrong.
>>
>> Thank you in advance.
>>
>> ------------------------------------------------------------------------------
>> Sell apps to millions through the Intel(R) Atom(Tm) Developer Program
>> Be part of this innovative community and reach millions of netbook users
>> worldwide. Take advantage of special opportunities to increase revenue and
>> speed time-to-market. Join now, and jumpstart your future.
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>> _______________________________________________
>> Matplotlib-users mailing list
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>>
>>      
>
>    

I cannot see what is wrong, but after saving each figure you should
add plt.clf() in order to delete the image and preventing memory
leaks, because MPL stores one image in top of the other.

For the filecode I suggest you to use something like:

savefig(head+str(filecode).zfill(digits)+format, dpi=205)
filecode+=1

where head is the name, digits an int and format usually .png.


Which backend are you using? Do you need it to be displayed on screen?
If not, the backend Agg is best.



Regards,

David.


On Wed, Aug 25, 2010 at 5:28 AM, David Pine <dj...@gm...> wrote:
> I am trying to save the frames from a matplotlib animation and I have a question that is undoubtedly based on a profound lack of understanding about how matplotlib/python works, but I'm hoping someone can offer me an explanation.  The following code is excerpted from the animation examples "animation_blit_wx.py".  The example works fine unless I include the #***** line meant to record the animations in included.  If the line is included, the animated line is no longer drawn to the screen or to the sequence of plots I am trying to save.  That is, the background is displayed and saved, but not the animated line.  Why?
>
>
> def update_line(*args):
>    global blit_time
>
>    if update_line.background is None:
>        update_line.background = canvas.copy_from_bbox(ax.bbox)
>
>    # restore the clean slate background
>    canvas.restore_region(update_line.background)
>    # update the data
>    line.set_ydata(npy.sin(x+update_line.cnt/10.0))
>    # just draw the animated artist
>    ax.draw_artist(line)
>    # just redraw the axes rectangle
>
>    t = time.time()
>    canvas.blit(ax.bbox)
>    blit_time += time.time() - t
>    #***** plt.savefig('f' + str(update_line.cnt) + '.png') *****
>
>    if update_line.cnt == NBLITS:
>        # print the timing info and quit
>        frame_time = time.time() - tstart
>        print '%d frames: %.2f seconds' % (NBLITS, frame_time)
>        print '%d blits:  %.2f seconds' % (NBLITS, blit_time)
>        print
>        print 'FPS: %.2f' % (NBLITS/frame_time)
>        print 'BPS: %.2f' % (NBLITS/blit_time)
>        sys.exit()
>
>    update_line.cnt += 1
>    wx.WakeUpIdle()
>
>
> ------------------------------------------------------------------------------
> Sell apps to millions through the Intel(R) Atom(Tm) Developer Program
> Be part of this innovative community and reach millions of netbook users
> worldwide. Take advantage of special opportunities to increase revenue and
> speed time-to-market. Join now, and jumpstart your future.
> http://p.sf.net/sfu/intel-atom-d2d
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>

I am trying to save the frames from a matplotlib animation and I have a question that is undoubtedly based on a profound lack of understanding about how matplotlib/python works, but I'm hoping someone can offer me an explanation.  The following code is excerpted from the animation examples "animation_blit_wx.py".  The example works fine unless I include the #***** line meant to record the animations in included.  If the line is included, the animated line is no longer drawn to the screen or to the sequence of plots I am trying to save.  That is, the background is displayed and saved, but not the animated line.  Why?


def update_line(*args):
    global blit_time

    if update_line.background is None:
        update_line.background = canvas.copy_from_bbox(ax.bbox)

    # restore the clean slate background
    canvas.restore_region(update_line.background)
    # update the data
    line.set_ydata(npy.sin(x+update_line.cnt/10.0))
    # just draw the animated artist
    ax.draw_artist(line)
    # just redraw the axes rectangle

    t = time.time()
    canvas.blit(ax.bbox)
    blit_time += time.time() - t
    #***** plt.savefig('f' + str(update_line.cnt) + '.png') *****

    if update_line.cnt == NBLITS:
        # print the timing info and quit
        frame_time = time.time() - tstart
        print '%d frames: %.2f seconds' % (NBLITS, frame_time)
        print '%d blits:  %.2f seconds' % (NBLITS, blit_time)
        print
        print 'FPS: %.2f' % (NBLITS/frame_time)
        print 'BPS: %.2f' % (NBLITS/blit_time)
        sys.exit()

    update_line.cnt += 1
    wx.WakeUpIdle()