Re: [matplotlib-devel] matplotlib image tutorial

2009-08-29 Thread John Hunter 
On Sat, Aug 29, 2009 at 10:58 AM, Michael Sarahan wrote:
> Here you go.  If you can think of anything else to include, I'll work
> on it.  I think the next thing I'll add is something on embedding
> images in the corners of plots.  figimage is the way to do this,
> right?

It depends on exactly what you are trying to do -- figimage is a pure
pixel dump, so it doesn't scale with DPI.  It is good for people who
want to put raw data into a figure, but not for much else.  You can
also use the "extent" argument to a regular image to

> The image is on that I took, so don't worry about licensing on it.  My
> images are licensed under Creative Commons.


Great -- I've pushed this out to the website.  Thanks a lot.  You can
see the fruits of your labors at

http://matplotlib.sourceforge.net/users/image_tutorial.html

If you want to make any more enhancements, the easiest way for me is
to submit a diff against the 0.99 release branch

 > svn co https://matplotlib.svn.sf.net/svnroot/matplotlib/branches/v0_99_maint
mpl99
  # make your edits
 > svn diff > imagetut.diff

See also, 
http://matplotlib.sourceforge.net/faq/howto_faq.html#contributing-howto

As for stuff to be added, here is a laundry list after a quick once
over, in no particular order

  * pointers to the matplotlib.colors, matplotlib.cm,
matplotlib.colorbar api docs

  * port the matplotlib.image module to have rest compliant docs,
incorporate them into the api docs, and link to them from the tutorial

  * discuss the image aspect settings with some examples

  * show how to use the matplotlib.cm objects, eg cm.jet, cm.hot in
addition to the strings 'jet', 'hot'

  * adjusting the size of the colorbar so it is the same height as your image

  * show how to create a custom colormap (there are examples for this
you could follow), either using listed colors or writing your own
linear segmented colormap

  * discuss figimage

  * discuss the extent argument

For many of these, if you don't know how to get started, read the doc
strings and then go to the search page and use the codex argument to
search for code examples.  Eg a search for "codex imshow extent" will
show image examples that use the extent kwarg

  http://matplotlib.sourceforge.net/search.html

Going forward, if you have further questions or need pointers to docs
or examples, please post to matplotlib-devel and let people know what
you are doing.  I sometimes get swallowed by all the stuff I am doing
so cannot always answer promptly, so it is good to have some backup.
I've take the liberty of CC-ing the devel list here in case others
want to jump in with suggestions or contributions to the tutorial

  https://lists.sourceforge.net/lists/listinfo/matplotlib-devel

Thanks a lot for this -- the docs are making a lot of progress and
there is a ton of good stuff in mpl that still has no tutorial on how
to use it, so this is plugging one of those holes.

JDH

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Re: [matplotlib-devel] semilogx and semilogy don't reset linear scale

2009-08-29 Thread Tony S Yu 
Did this email ever appear on list? I didn't see it after sending my  
original post, but I found it on the Sourceforge mail archives. I'm  
trying a different email address as an experiment.

In any case, any comments on the patch?

-Tony

On Aug 24, 2009, at 5:31 PM, Tony Yu wrote:

> I noticed that semilogx and semilogy don't check if the linear axis  
> (y-axis for semilogx; x-axis for semilogy) is actually linear. Thus,  
> if I call semilogx and then call semilogy *on the same plot*, I end  
> up with a loglog plot.
>
> Below is a simple patch. I'm not sure how useful this fix is since  
> most people wouldn't want to make these calls on the same plot  
> (since the second call would override the first)---I was working  
> interactively in IPython so it did make a difference.
>
> Cheers,
> -Tony
>
>
> Index: lib/matplotlib/axes.py
> ===
> --- lib/matplotlib/axes.py(revision 7557)
> +++ lib/matplotlib/axes.py(working copy)
> @@ -3615,6 +3615,7 @@
>  }
>
> self.set_xscale('log', **d)
> +self.set_yscale('linear')
> b =  self._hold
> self._hold = True # we've already processed the hold
> l = self.plot(*args, **kwargs)
> @@ -3665,6 +3666,7 @@
>  'nonposy': kwargs.pop('nonposy', 'mask'),
>  }
> self.set_yscale('log', **d)
> +self.set_xscale('linear')
> b =  self._hold
> self._hold = True # we've already processed the hold
> l = self.plot(*args, **kwargs)


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Re: [matplotlib-devel] semilogx and semilogy don't reset linear scale

2009-08-29 Thread Eric Firing 
Tony S Yu wrote:
> Did this email ever appear on list? I didn't see it after sending my  
> original post, but I found it on the Sourceforge mail archives. I'm  
> trying a different email address as an experiment.

Tony,

It did appear the first time, but I guess everyone who saw it figured 
someone else would deal with it.
> 
> In any case, any comments on the patch?

Looks reasonable to me.  I will apply it.

Eric

> 
> -Tony
> 
> On Aug 24, 2009, at 5:31 PM, Tony Yu wrote:
> 
>> I noticed that semilogx and semilogy don't check if the linear axis  
>> (y-axis for semilogx; x-axis for semilogy) is actually linear. Thus,  
>> if I call semilogx and then call semilogy *on the same plot*, I end  
>> up with a loglog plot.
>>
>> Below is a simple patch. I'm not sure how useful this fix is since  
>> most people wouldn't want to make these calls on the same plot  
>> (since the second call would override the first)---I was working  
>> interactively in IPython so it did make a difference.
>>
>> Cheers,
>> -Tony
>>
>>
>> Index: lib/matplotlib/axes.py
>> ===
>> --- lib/matplotlib/axes.py   (revision 7557)
>> +++ lib/matplotlib/axes.py   (working copy)
>> @@ -3615,6 +3615,7 @@
>>  }
>>
>> self.set_xscale('log', **d)
>> +self.set_yscale('linear')
>> b =  self._hold
>> self._hold = True # we've already processed the hold
>> l = self.plot(*args, **kwargs)
>> @@ -3665,6 +3666,7 @@
>>  'nonposy': kwargs.pop('nonposy', 'mask'),
>>  }
>> self.set_yscale('log', **d)
>> +self.set_xscale('linear')
>> b =  self._hold
>> self._hold = True # we've already processed the hold
>> l = self.plot(*args, **kwargs)
> 
> 
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Re: [matplotlib-devel] matplotlib image tutorial

2009-08-29 Thread Gary Ruben 
Very nice addition Michael.

I note that the plt.colormap() line must have gotten lost. It's referred 
to but not there.
I'll add some ideas to John's list:

* Demonstrate the imsave() command.
* Rather than show 50 lines or so of array data, just show a few lines, 
but demonstrate what img.shape is before and after slicing out the B 
channel with img[:,:,0]
* It may be worth mentioning explicitly that img[:,:,0] will give you 
the blue channel for an RGB and an RGBA image.
* Demonstrate the "upper" and "lower" keywords where relevant.
* Add a pointer to the scipy.ndimage module
* Extend the examples with RGB and RGBA images.
* You might like to show how to recarrays and views on the individual 
colour channels. There are examples in the mailing list archives or 
maybe on the scipy website - I can't remember where.
* If you want to get more advanced, talk about higher bit depth images 
than 8 bits per channel.
* If you want to get even more advanced, show how to change the UI to 
probe the pixel value (I wish matplotlib did this by default).

Gary R.

John Hunter wrote:
> On Sat, Aug 29, 2009 at 10:58 AM, Michael Sarahan 
> wrote:
>> Here you go.  If you can think of anything else to include, I'll work
>> on it.  I think the next thing I'll add is something on embedding
>> images in the corners of plots.  figimage is the way to do this,
>> right?


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Re: [matplotlib-devel] writing plain text to multi page pdf

2009-08-29 Thread John Hunter 
On Fri, Aug 28, 2009 at 4:27 AM, Jouni K. Seppänen wrote:
> Should the coordinates be raw PDF points measured from the bottom left
> corner, or passed through the figure transformation (or something else)?
> What sort of font properties would you expect to be allowed?
>
>> One could use the matplotlib.text.Text
>> and add it to your figure, and maybe this is the way to go,
>
> I think that's what the pdf backend would end up doing internally, at
> least if anything like coordinate transformations or any interesting
> font properties need to be supported. It sounds like a fairly easy
> change.

This is a tough call.  mpk is not so good at multiline text.  Maybe
the solution is to make mpl good at multiline text, but I was
wondering if there was an easy way to "dump a paragraph" at the pdf
level, and have it newline separate the text and make it look
acceptable.  I don't really know enough about the pdf spec to know if
this is sensible.  Of course, as soon as you support a little, people
will want you to support more, fonts and sizes and math and
what-have-you.  So maybe the better solution is to make mpl multiline
text better.

> While we're discussing multi-page pdf files, would it be useful to have
> pyplot-level support for them? It shouldn't be too hard to have pyplot
> track your currently open pdf file and make, say, savefig with no
> arguments direct the output to that. I personally don't have a use for
> that, but do you think it would be a useful part of pyplot?

The current interface looks easy enough to use -- it just needs to be
advertised better, eg in a FAQ ( I had to read the source to find it,
which works well enough for me, but not for everyone).  If you want to
write one up, I'll add it to the docs.

JDH

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Re: [matplotlib-devel] ginput default mouse configuration

2009-08-29 Thread John Hunter 
On Mon, Aug 17, 2009 at 11:24 AM, Jack Sankey wrote:
> Hello Gael,
> Okay, I've updated the two files I modified here:
> http://sites.google.com/site/jacksankey/files/matplotlib.zip?attredirects=0
> Sorry I can't figure out how to compile. I wish it was possible to have an
> SVN containing also the windows binaries. Too bad we all can't just run
> Linux.
> Anyway, I tested the pants off  this using an imshow() color plot this
> morning, and it works well on windows XP/wxAgg. There are two things worth
> mentioning:
> - For some reason, the enter key does not generate an event for me. I've
> added "escape" as another possible keyboard stop event generator.
> - The backspace key causes the plot to undo a zoom. This confused me for an
> hour. Use delete!
> - I'm fairly certain the mouse numbers are different for windows. I can't
> make the middle mouse button do anything.
> If you don't wind up adding all these changes, in the very least for the
> upcoming release, can you please add "escape" to the list of keys that will
> exit the collection of data points? That would amount to changing one line
> in key_event() from
> elif key == 'enter'
> to
> elif key in ['escape', 'enter']:
> The third point above is the reason I looked into this in the first place; I
> couldn't stop collecting! :) Adding 'escape' would make ginput() functional
> enough. (I also use key = event.key.lower() to be safe.)
> Thanks!
> -Jack

Hi Jack,

I've tried to apply your code properly.  Because it was not a patch,
but a simple code file submission (and the original files have changed
since your submission) and because I did not write the original ginput
code, it was touch sledding to apply the patch.  I think I got it
right, but I would like people who use ginput and blocking input to
give it a test drive (I did what basic tests I could, not being a
power user).

Thanks for the submission,
JDH

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Re: [matplotlib-devel] semilogx and semilogy don't reset linear scale

2009-08-29 Thread Andrew Straw 
Eric Firing wrote:
> Tony S Yu wrote:
>   
>> Did this email ever appear on list? I didn't see it after sending my  
>> original post, but I found it on the Sourceforge mail archives. I'm  
>> trying a different email address as an experiment.
>> 
>
> Tony,
>
> It did appear the first time, but I guess everyone who saw it figured 
> someone else would deal with it.
>   
>> In any case, any comments on the patch?
>> 
>
> Looks reasonable to me.  I will apply it.
>   
I think this caused the test_matplotlib.TestAxes.empty_datetime test to
fail. You can see the result at
http://mpl.code.astraw.com/mac-osx-x86-sage/test_matplotlib.TestAxes.empty_datetime/overview.html

Specifically, it looks like the farthest left xticklabel is no longer
getting displayed. Personally, I think it looks better this way, but now
that the test suite is coming online, we will finally start noticing
little things like this.

Eric, if you think the new image is OK, can you download it from
http://mpl.code.astraw.com/mac-osx-x86-sage/test_matplotlib.TestAxes.empty_datetime/actual.gif
and then check it into
test/test_matplotlib/baseline/TestAxes/empty_datetime.png

In fact, I just checked in a KnownFail test decorator heavily based on
numpy's implementation, so once this test starts passing, the Mac OS X
buildslave should have all the tests returning success or knownfail.

Thanks,
Andrew


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Re: [matplotlib-devel] writing plain text to multi page pdf

2009-08-29 Thread Jouni K . Seppänen 
John Hunter  writes:

> This is a tough call.  mpk is not so good at multiline text.  Maybe
> the solution is to make mpl good at multiline text, but I was
> wondering if there was an easy way to "dump a paragraph" at the pdf
> level, and have it newline separate the text and make it look
> acceptable.

Ah, so it's about multiline text. Yes, pdf has a "newline" operator 
that could be used to lay out simple paragraphs. I'll take a look later
today to see how complicated it would need to be.

> The current interface looks easy enough to use -- it just needs to be
> advertised better, eg in a FAQ ( I had to read the source to find it,
> which works well enough for me, but not for everyone).  If you want to
> write one up, I'll add it to the docs.

I seem to recall that the ReST docstring of backend_pdf.PdfPages was
included in the documentation at some point, but it is missing now from
. Of
course the "backends" chapter may not get read by many users, so there
could be a pointer to it from some suitable place elsewhere in the
documentation.

-- 
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http://www.iki.fi/jks


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Re: [matplotlib-devel] semilogx and semilogy don't reset linear scale

2009-08-29 Thread Eric Firing 
Andrew Straw wrote:
> Eric Firing wrote:
>> Tony S Yu wrote:
>>   
>>> Did this email ever appear on list? I didn't see it after sending my  
>>> original post, but I found it on the Sourceforge mail archives. I'm  
>>> trying a different email address as an experiment.
>>> 
>> Tony,
>>
>> It did appear the first time, but I guess everyone who saw it figured 
>> someone else would deal with it.
>>   
>>> In any case, any comments on the patch?
>>> 
>> Looks reasonable to me.  I will apply it.
>>   
> I think this caused the test_matplotlib.TestAxes.empty_datetime test to
> fail. You can see the result at
> http://mpl.code.astraw.com/mac-osx-x86-sage/test_matplotlib.TestAxes.empty_datetime/overview.html
> 
> Specifically, it looks like the farthest left xticklabel is no longer
> getting displayed. Personally, I think it looks better this way, but now
> that the test suite is coming online, we will finally start noticing
> little things like this.

I agree that the newer version, without the first label, is better--but 
I can't imagine how the change to semilogx and semilogy could make a 
difference like this.  It must be something else.

> 
> Eric, if you think the new image is OK, can you download it from
> http://mpl.code.astraw.com/mac-osx-x86-sage/test_matplotlib.TestAxes.empty_datetime/actual.gif
> and then check it into
> test/test_matplotlib/baseline/TestAxes/empty_datetime.png

Done (with *.png, not actual.gif).

Eric

> 
> In fact, I just checked in a KnownFail test decorator heavily based on
> numpy's implementation, so once this test starts passing, the Mac OS X
> buildslave should have all the tests returning success or knownfail.
> 
> Thanks,
> Andrew
> 
> 
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