numpy.ma.fromfunction¶
-
numpy.ma.
fromfunction
(function, shape, **kwargs) = <numpy.ma.core._convert2ma object>¶ Construct an array by executing a function over each coordinate.
The resulting array therefore has a value
fn(x, y, z)
at coordinate(x, y, z)
.Parameters: function : callable
shape : (N,) tuple of ints
Shape of the output array, which also determines the shape of the coordinate arrays passed to function.
dtype : data-type, optional
Data-type of the coordinate arrays passed to function. By default, dtype is float.
Returns: fromfunction : any
The result of the call to function is passed back directly. Therefore the shape of
fromfunction
is completely determined by function. If function returns a scalar value, the shape offromfunction
would match theshape
parameter.See also
indices
,meshgrid
Notes
Keywords other than dtype are passed to function.
Examples
>>> np.fromfunction(lambda i, j: i == j, (3, 3), dtype=int) array([[ True, False, False], [False, True, False], [False, False, True]])
>>> np.fromfunction(lambda i, j: i + j, (3, 3), dtype=int) array([[0, 1, 2], [1, 2, 3], [2, 3, 4]])