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	Does matplotlib have a convenient way to produce a histogram of 
categorical (possibly non-numeric) values?  I can do it with bar(), 
but there's a fair amount of boilerplate involved (calculating the 
frequencies, counting the number of distinct values, etc.).  This 
seems like it would be a common task, so I'm wondering if there's a 
function for it, or, failing that, a standard recipe.

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

Try tricontourf; I've attached an example.  Most of the example code is
manipulating your input data and calculating the connectivity of your grid.

I hope this helps,
Ian Thomas

Nader A, on 2011-07-08 20:22,  wrote:
> I am new to matplotlib. 

Welcome to the community!

> What I want to do is instead of filling the color in red, i want to the
> color to be a contour plot of the stress.  

I think contour and contourf will do what you want, see:
http://matplotlib.sourceforge.net/examples/pylab_examples/contour_image.html

best,
-- 
Paul Ivanov
314 address only used for lists,  off-list direct email at:
http://pirsquared.org | GPG/PGP key id: 0x0F3E28F7 

Greetings, 

I am new to matplotlib. 
I have to plot a cross section of a cylinder and I want apply the stress in
the section to be a contour plot.  Similar to what you get from a Finite
Element Analysis data.  I have the data organized such that I can use
fill_between to create the basic plot and I use the a uniform color (red)
for now to fill between the lines.  The data organized is organized (see
attached 'data.txt' file) such that the fill_between is used as follows: 

http://old.nabble.com/file/p32023678/data.txt data.txt  

plt.fill_between(X, Y1, Y2,facecolor='red',alpha=alpha,linewidth=2)
plt.fill_between(X, Y3, Y4,facecolor='red',alpha=alpha,linewidth=2)

This produces a figure in this format: 

  http://old.nabble.com/file/p32023678/Uniform_Color.png 

What I want to do is instead of filling the color in red, i want to the
color to be a contour plot of the stress.  The stress values are shown in
the last column of the 'data.txt' file.   So, based on the stress values,
the fill in color should vary (say from blue for min(stress) values and red
for max(stress) values.  
 I was able to do a color extract for regions, but the colors are not
gradient and smooth as should be in stress contour plot.  
The example I was able to do is as follow: 

http://old.nabble.com/file/p32023678/Contour.png 


I appreciate any help on this matter. 

Thanks, 

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