matplotlib-users Mailing List for matplotlib

Does anyone out there happen to know a simple algorithm for least  
squares fitting a great circle to a given set of lat/lon points on a  
sphere?  Seems like it might not be a crazy thing to add to the library.

Thanks!
Zane

--
Zane Selvans
Amateur Earthling
http://zaneselvans.org
za...@id...
303/815-6866
PGP Key: 55E0815F

Thanks,

I think it is great that the color can be specified as either 3 or 4 columns.  It would be nice if the bar plot color arguments also had this flexibility.  They currently fail when the color has 4 columns.

Will this bug fix need to wait until the next official release?  (I am constrained to using the official releases and not the svn code).

Thanks,
-Ben

-----Original Message-----
From: Michael Droettboom [mailto:md...@st...]
Sent: Monday, August 04, 2008 10:17 AM
To: Ben Axelrod
Cc: mat...@li...
Subject: Re: [Matplotlib-users] 0.98.3 scatter plot color bug?

Looks like a bug -- it should accept either 3 or 4 columns. I'll have a
chance to look at this further this afternoon.

Cheers,
Mike

Ben Axelrod wrote:
>
> I get an error when I use the scatter plot and set the 'c' value to a
> list of 3-tuples. The error goes away if I use 4-tuples instead. Are
> colors with only 3 values not supported anymore?
>
> ...
>
> File "C:\Python24\Lib\site-packages\matplotlib\axes.py", line 4807, in
> scatter
>
> colors = mcolors.colorConverter.to_rgba_array(c, alpha)
>
> File "C:\Python24\Lib\site-packages\matplotlib\colors.py", line 343,
> in to_rgba_array
>
> c[i] = self.to_rgba(cc, alpha) # change in place
>
> ValueError: shape mismatch: objects cannot be broadcast to a single shape
>
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--
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA

Looks like a bug -- it should accept either 3 or 4 columns. I'll have a 
chance to look at this further this afternoon.

Cheers,
Mike

Ben Axelrod wrote:
>
> I get an error when I use the scatter plot and set the ‘c’ value to a 
> list of 3-tuples. The error goes away if I use 4-tuples instead. Are 
> colors with only 3 values not supported anymore?
>
> …
>
> File "C:\Python24\Lib\site-packages\matplotlib\axes.py", line 4807, in 
> scatter
>
> colors = mcolors.colorConverter.to_rgba_array(c, alpha)
>
> File "C:\Python24\Lib\site-packages\matplotlib\colors.py", line 343, 
> in to_rgba_array
>
> c[i] = self.to_rgba(cc, alpha) # change in place
>
> ValueError: shape mismatch: objects cannot be broadcast to a single shape
>
> ------------------------------------------------------------------------
>
> -------------------------------------------------------------------------
> This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
> Build the coolest Linux based applications with Moblin SDK & win great prizes
> Grand prize is a trip for two to an Open Source event anywhere in the world
> http://moblin-contest.org/redirect.php?banner_id=100&url=/
> ------------------------------------------------------------------------
>
> _______________________________________________
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> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>   

-- 
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA

I get an error when I use the scatter plot and set the 'c' value to a list of 3-tuples.  The error goes away if I use 4-tuples instead.  Are colors with only 3 values not supported anymore?

  ...
  File "C:\Python24\Lib\site-packages\matplotlib\axes.py", line 4807, in scatter
    colors = mcolors.colorConverter.to_rgba_array(c, alpha)
  File "C:\Python24\Lib\site-packages\matplotlib\colors.py", line 343, in to_rgba_array
    c[i] = self.to_rgba(cc, alpha)  # change in place
ValueError: shape mismatch: objects cannot be broadcast to a single shape

2008/8/4 Michael Droettboom <md...@st...>:
> The graphviz failing is my bad.  I failed to test the latex doc build (since
> it never works for me anyway due to a too-old version of latex).  This is
> fixed in SVN r5962, and a patch against doc/sphinxext/inheritance_diagram.py
> is attached.

Err... the attached patch is empty :D Anyhow, I'm subscribed to commit
ml, so I got it:

--- trunk/matplotlib/doc/sphinxext/inheritance_diagram.py
2008-08-04 12:20:25 UTC (rev 5961)
+++ trunk/matplotlib/doc/sphinxext/inheritance_diagram.py
2008-08-04 13:09:02 UTC (rev 5962)
@@ -346,7 +346,7 @@
    parts = node['parts']

    graph_hash = get_graph_hash(node)
-    name = "inheritance%s"
+    name = "inheritance%s" % graph_hash
    pdf_path = os.path.join('_static', name + ".pdf")

    graph.run_dot(['-Tpdf', '-o%s' % pdf_path],

(sorry if gmail wraps it).

I'll apply it once at home and test if works in Debian: Thanks for the
prompt reply!!

Sandro

-- 
Sandro Tosi (aka morph, Morpheus, matrixhasu)
My website: http://matrixhasu.altervista.org/
Me at Debian: http://wiki.debian.org/SandroTosi

On Sun, Aug 3, 2008 at 1:19 PM, Charlie Moad <cw...@gm...> wrote:

> I was going to wait on John about the docs, but I went ahead and cut the
> 0.98.3 release.  The sdist including the docs was 34MB, so I decided not to
> include them.  This would also cause the binaries to be huge if we included
> them there as well.  The source release is up/tagged and I will post
> binaries asap.

I assume you are referring to the built (html, pdf) docs.  While we
don't want to ship the doc builds, we do want to ship the doc sources.
 If you first do an svn-clean before making the sdist  the build comes
in around 5 MB.

Thanks for doing the release, BTW.

JDH

Perfect!

Thanks guys

Did this in the end:

plot(Time, Value, 'o', markersize = 1, markerfacecolor = '#330066',
markeredgecolor = '#330066'
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The graphviz failing is my bad.  I failed to test the latex doc build 
(since it never works for me anyway due to a too-old version of latex).  
This is fixed in SVN r5962, and a patch against 
doc/sphinxext/inheritance_diagram.py is attached.

Cheers,
Mike

Sandro Tosi wrote:
> On Sun, Aug 3, 2008 at 20:29, Sandro Tosi <mat...@gm...> wrote:
>   
>> On Sun, Aug 3, 2008 at 20:19, Charlie Moad <cw...@gm...> wrote:
>>     
>>> I was going to wait on John about the docs, but I went ahead and cut the
>>> 0.98.3 release.  The sdist including the docs was 34MB, so I decided not to
>>> include them.  This would also cause the binaries to be huge if we included
>>> them there as well.  The source release is up/tagged and I will post
>>> binaries asap.
>>>       
>> Thanks a lot, Charlie!! I'm downloading the brand new tarball and I'll
>> upgrade the Debian package short after.
>>     
>
> While building (in a clean chroot) the package to upload in Debian, I
> noticed some errors at doc creation (I attach the complete log, it
> might help you to track the issue), something like:
>
> WARNING: /tmp/buildd/matplotlib-0.98.3/build/lib.linux-x86_64-2.5/matplotlib/axes.py:docstring
> of matplotlib.axes.Axes.acorr:35: (ERROR/3) Unexpected indentation.
> WARNING: <autodoc>:0: (ERROR/3) Unexpected indentation.
> WARNING: /tmp/buildd/matplotlib-0.98.3/build/lib.linux-x86_64-2.5/matplotlib/backend_bases.py:docstring
> of matplotlib.backend_bases.FigureCanvasBase.stop_event_loop_default:8:
> (WARNING/2) Literal block expected; none found.
> WARNING: /tmp/buildd/matplotlib-0.98.3/doc/api/backend_qt4agg_api.rst:5:
> (WARNING/2) autodoc can't import/find module
> 'matplotlib.backends.backend_qt4agg', it reported error: "cannot
> import name QtCore",please check your spelling and sys.path
> WARNING: /tmp/buildd/matplotlib-0.98.3/doc/api/cbook_api.rst:9:
> (WARNING/2) error while formatting signature for
> matplotlib.cbook.Xlator: arg is not a Python function
> WARNING: /tmp/buildd/matplotlib-0.98.3/build/lib.linux-x86_64-2.5/matplotlib/pyplot.py:docstring
> of matplotlib.pyplot.acorr:55: (ERROR/3) Unexpected indentation.
> WARNING: /tmp/buildd/matplotlib-0.98.3/build/lib.linux-x86_64-2.5/matplotlib/pyplot.py:docstring
> of matplotlib.pyplot.annotate:17: (ERROR/3) Unexpected indentation.
> [...]
> resolving references...
> writing... Error: <stdin>:1: syntax error near line 1
> context: digraph >>>  inheritance <<< s {
> WARNING: /tmp/buildd/matplotlib-0.98.3/doc/index.rst:None: (WARNING/2)
> 'dot' returned the errorcode 1
> WARNING: unusable reference target found:
> https://sourceforge.net/project/admin/?group_id=80706
> Error: <stdin>:1: syntax error near line 1
> context: digraph >>>  inheritance <<< s {
> WARNING: /tmp/buildd/matplotlib-0.98.3/doc/index.rst:None: (WARNING/2)
> 'dot' returned the errorcode 1
> Error: <stdin>:1: syntax error near line 1
> context: digraph >>>  inheritance <<< s {
> WARNING: /tmp/buildd/matplotlib-0.98.3/doc/index.rst:None: (WARNING/2)
> 'dot' returned the errorcode 1
> Error: <stdin>:1: syntax error near line 1
> context: digraph >>>  inheritance <<< s {
> WARNING: /tmp/buildd/matplotlib-0.98.3/doc/index.rst:None: (WARNING/2)
> 'dot' returned the errorcode 1
>
> I don't know if something bad has happened in mpl code or something in
> Debian is broken right now (graphviz?), but it would help me if
> someone can confirm this is not happening only on my box.
>
> Thanks,
>   
> ------------------------------------------------------------------------
>
> -------------------------------------------------------------------------
> This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
> Build the coolest Linux based applications with Moblin SDK & win great prizes
> Grand prize is a trip for two to an Open Source event anywhere in the world
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-- 
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA

On Mon, Aug 4, 2008 at 4:48 AM, Manuel Metz <mm...@as...> wrote:

> Use the named kwarg "linestyle":
>
>   plot(Time, Value, '#330066', linestyle='.')

I think you meant marker, since the '.' represents a marker rather
than a linestyle

  plot(Time, Value, color='#330066', marker='.')

JDH

stuartornum wrote:
> Hi,
> 
> I am just playing around with different shapes and colours at the moment, I
> have managed the "standard" colours like this:
> 
> plot(Time, Value, 'r.')
> 
> Which obviously prints a red dot.
> 
> However how do use the hex colour map with the ".", I have tried:
> 
> plot(Time, Value, '#330066.')
> plot(Time, Value, '#330066,.')
> plot(Time, Value, '#330066' '.')
> plot(Time, Value, '#330066', '.')
> 
> Not quite sure on the syntax.
> 

Use the named kwarg "linestyle":

   plot(Time, Value, '#330066', linestyle='.')

Hi,

I am just playing around with different shapes and colours at the moment, I
have managed the "standard" colours like this:

plot(Time, Value, 'r.')

Which obviously prints a red dot.

However how do use the hex colour map with the ".", I have tried:

plot(Time, Value, '#330066.')
plot(Time, Value, '#330066,.')
plot(Time, Value, '#330066' '.')
plot(Time, Value, '#330066', '.')

Not quite sure on the syntax.

Thank you in advance
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