Re: [Matplotlib-users] don't understand pcolor output. any help greatly appreciated

[John H. <jdh...@ac...>]

>>>>> "seberino" == seberino  <seb...@sp...> writes:

    seberino> I'm trying to make a 2D color plot where the z-axis
    seberino> values show up as different colors for each (x,y) point.
    seberino> I tried to plot the list a+b+c+d using the code snipped
    seberino> below.  I don't understand why this regular grid of
    seberino> points is giving me the weird color plot attached.  Any
    seberino> help would be greatly appreciated.

    seberino> WHY DON't I SEE **SQUARES** OF COLORS IN ATTACHED
    seberino> PLOT???

Because you are not filling your arrays properly.  Print xarray and
yarray in your example and you'll see the problem.  In your example,
xarray is

[[ 1  2  3  4]
 [ 5  6  7  8]
 [ 9 10  1  2]
 [ 3  4  5  6]
 [ 7  8  9 10]
 [ 1  2  3  4]
 [ 5  6  7  8]
 [ 9 10  1  2]
 [ 3  4  5  6]
 [ 7  8  9 10]]

is which is causing the weird plots you observe.

In your script, the problem line is

  xarray.shape = yarray.shape = zarray.shape = xsize, ysize

replace this with  

  xarray.shape = yarray.shape = zarray.shape = ysize, xsize

and you'll get the pcolor you are looking for, I suspect.


JDH