Plot array content in grid

Question

Now I have a 24*20 array as below:

In [748]: zb_mean
Out[748]: 
array([[          nan,   20.68575654,   14.11937546,           nan,
              nan,           nan,           nan,           nan,
              nan,           nan,           nan,           nan,
              nan,           nan,           nan,           nan,
              nan,           nan,           nan,           nan],
   [          nan,           nan,           nan,           nan,
              nan,           nan,           nan,           nan,
              nan,           nan,           nan,           nan,
... ... ...
... ... ...

In [749]: zb_mean.shape
Out[749]: (24, 20)

then I creat a grid according to the lat/lon as below:

xi = np.arange(-66,-72,-0.25)
yi = np.arange(40.5,45.5,0.25)

In [755]: len(xi),len(yi)
Out[755]: (24, 20)

xxb,yyb = np.meshgrid(xi, yi)

now the grid and the array have same dimension,I want to plot this grid(xxb,yyb) with the correspond value of array(zb_mean) in the center of each small grid, how should I do?thank you very much!

Trond Kristiansen · Accepted Answer · 2013-08-12 19:59:00Z

2

If I understand your question correct you want to plot the cells you have valid values. The trick is to use the method masked_invalid that will hide your nan values using the numpy function masked_invalid. I created a small example on how you can do this:

import numpy as np
test=np.asarray([[10,15,20,50],[30,40,nan,70],[nan,10,nan,25],[100,50,nan,60]])
test=np.ma.masked_invalid(test)

xi = np.arange(-66,-70,-1)
yi = np.arange(40.5,44.5,1)
xxb,yyb = np.meshgrid(xi, yi)

c=pcolor(xxb,yyb,test)
colorbar(c)

Hope this helps. Cheers, Trond

answered Aug 12, 2013 at 19:59

Trond Kristiansen

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2 Comments

wuwucat Over a year ago

tahnk you very much!!

pelson Over a year ago

For the record, pcolormesh would be a better choice here (it is much quicker for contiguous data).

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