matplotlib-devel Mailing List for matplotlib

Hi,

I will be on vacation with limited email from July 14 to August 7, 2011.

Bonjour,

Je serai en conge du 14 juillet jusqu'au 7 aout, 2011.

I came across this website where different colormaps have been compared 
and the author has come up with an optimal colormap for data 
visualization called the "cool-warm colormap".

http://www.cs.unm.edu/~kmorel/documents/ColorMaps/index.html

It is somewhat similar to the cool colormap already included in 
matplotlib, but I've added the new colormap to matplotlib in the patch 
attached in case it is deemed fit to be included in the matplotlib source.

Regards,
Sameer

Came across an oddity here in one of the demos:
http://matplotlib.sourceforge.net/mpl_toolkits/mplot3d/tutorial.html#subplotting

In the second subplotting example, there is supposed to be a y-axis label,
but it is being cut off.  In this example, I used plt.figaspect() to set an
appropriate figure aspect for a 2x1 subplot grid.  However, it looks like it
sets the figure too narrow.  The aspect ratio has to be set to around 1.05
before the entire y-axis label appears.  I don't know if this is a bug or
not, but I thought I ought to raise this issue.

Ben Root

Hi,
 
Using matplotlib.path.Path.arc to create a wedge (e.g. via matplotlib.path.Path.wedge) creates a Path with three uninitialized vertex positions. (The first one and the last two.)
 
As you would expect - sometimes this leads to nasty drawing artifacts!
 
I've tried zeroing the entire array and a couple of ways to just zero the offending vertices, but they all have equal performance, so I've gone with zeroing the entire array. It has the simplest, cleanest code, and will be more robust to future changes.
 
Regards
Richard Hattersley
 
 
--------------- patch follows ----------------------- 
 
>From 6f5d9f71d1d56d80c0c1764268a6ddfc3f653f44 Mon Sep 17 00:00:00 2001
From: Richard Hattersley <hat...@bt...>
Date: Mon, 18 Jul 2011 14:20:16 +0100
Subject: [PATCH] Fix uninitialized vertices in Path.arc() for wedges.
---
 lib/matplotlib/path.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/lib/matplotlib/path.py b/lib/matplotlib/path.py
index da37d7d..d5461b0 100644
--- a/lib/matplotlib/path.py
+++ b/lib/matplotlib/path.py
@@ -621,7 +621,7 @@ class Path(object):
         if is_wedge:
             length = n * 3 + 4
-            vertices = np.empty((length, 2), np.float_)
+            vertices = np.zeros((length, 2), np.float_)
             codes = cls.CURVE4 * np.ones((length, ), cls.code_type)
             vertices[1] = [xA[0], yA[0]]
             codes[0:2] = [cls.MOVETO, cls.LINETO]
--
1.7.6