[SciPy-User] Creating meshgrid from meshgrid

[Chris Barker]

I'm confused as to what you are trying to do.

Meshgrid is used to create a regular grid when you have a vectors of the
axes.

It support 2 or more dimensions.

I have two arrays of size N (let's say 2 arrays of length 4) that I combine
> using np.meshgrid
>
> xxA, yyA = np.meshgrid(xA, yA)
> xxB, yyB = np.meshgrid(xB, yB)
>
> which gives me two meshes
>
> xx.shape = yy.shape = (4,4)
> which represent a N-dimensional mesh with 16 elements.
>

no -- it represents a 2-dimensional mesh with four nodes in each direction.


> Now I want to evaluate a function f on every possible pair of
> N-dimensional points in the grid, resulting in a 16 x 16
> matrix:
>

I think you are looking for a different function than meshgrid.

But if you want to evaluate a function on a four dimensional space, you can
use meshgrid with four dimensions:

xx, yy, zz, tt = meshgrid(x, y, z, t)

results = func(xx,yy,zz,tt)

note that with numpy's broadcasting, you may not need to use meshgrid at
all.

Is that what you are looking for?

-CHB


-- 

Christopher Barker, Ph.D.
Oceanographer

Emergency Response Division
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Chris.Barker at noaa.gov
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