matplotlib-users Mailing List for matplotlib

Hi all,
 
I am trying to get a scatter plot using a colormap. Additionally, I need to
define every marker for every data point individually - each being a
rectangle with fixed height but varying width as a function of the y-value.
X and y being the data coordinates, z being a number to be color coded with
the colormap.
Ideally, I would like to create a list of width and height values for each
data point and tell the scatter plot to use those.
So far I got colormapped data with custom markers (simplified):
 
[code]
 
import numpy as np
import matplotlib.pyplot as plt
from pylab import *
 
x = y = [1,2,3,4,5]
z = [2,4,6,8,10]
 
colors = cm.gnuplot2
 
verts_vec = list(zip([-10.,10.,10.,-10.],[-5.,-5.,5.,5.]))
 
fig = plt.figure(1, figsize=(14.40, 9.00))
ax = fig.add_subplot(1,1,1)
sc = ax.scatter(x, y, c=np.asarray(z), marker=None, edgecolor='None',
verts=verts_vec, cmap=colors, alpha=1.)
plt.colorbar(sc, orientation='horizontal')
plt.savefig('test.png', dpi=200)
plt.close(1)
 
[/code]
 
But I need to define a marker size for each point, and I also need to do
that in axis scale values, not in points.
I imagine giving verts a list of N*2 tuples instead of 2 tuples, N being
len(x), to define N individual markers.
But when doing that I get the error that vertices.ndim==2.
A less elegant way would be to plot every data point in an individual
scatter plot function, using a for-loop iterating over all data points.
Then, however, I see no way to apply a colormap and colorbar.
What is the best way to accomplish that then?
 
Thanks, 
 
-Hackstein
 
 
 
 

Not quite a module, but I think it does what you want:
http://matplotlib.1069221.n5.nabble.com/function-to-create-a-colormap-from-cpt-palette-td2165.html
Cheers, Jody
On Apr 24, 2013, at 9:16 AM, Andreas Hilboll <li...@hi...> wrote:
> Hi,
> I'd like to have the cpt-city colormaps available in matplotlib. Is
> there already a module for this? If not, I'll try to patch something
> together. What do you think?
> Cheers, Andreas
> 
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--
Jody Klymak 
http://web.uvic.ca/~jklymak/

Hi,
I'd like to have the cpt-city colormaps available in matplotlib. Is
there already a module for this? If not, I'll try to patch something
together. What do you think?
Cheers, Andreas