numpy.meshgrid

numpy.meshgrid(x, y)

Return coordinate matrices from two coordinate vectors.

Parameters :

x, y : ndarray

Two 1-D arrays representing the x and y coordinates of a grid.

Returns :

X, Y : ndarray

For vectors x, y with lengths Nx=len(x) and Ny=len(y), return X, Y where X and Y are (Ny, Nx) shaped arrays with the elements of x and y repeated to fill the matrix along the first dimension for x, the second for y.

See also

index_tricks.mgrid

Construct a multi-dimensional “meshgrid” using indexing notation.

index_tricks.ogrid

Construct an open multi-dimensional “meshgrid” using indexing notation.

Examples

>>> X, Y = np.meshgrid([1,2,3], [4,5,6,7])
>>> X
array([[1, 2, 3],
       [1, 2, 3],
       [1, 2, 3],
       [1, 2, 3]])
>>> Y
array([[4, 4, 4],
       [5, 5, 5],
       [6, 6, 6],
       [7, 7, 7]])

meshgrid is very useful to evaluate functions on a grid.

>>> x = np.arange(-5, 5, 0.1)
>>> y = np.arange(-5, 5, 0.1)
>>> xx, yy = np.meshgrid(x, y)
>>> z = np.sin(xx**2+yy**2)/(xx**2+yy**2)