xorbits.numpy.flatnonzero

xorbits.numpy.flatnonzero(a)

Return indices that are non-zero in the flattened version of a.

This is equivalent to np.nonzero(np.ravel(a))[0].

Parameters

a (array_like) – Input data.

Returns

res – Output array, containing the indices of the elements of a.ravel() that are non-zero.

Return type

ndarray

See also

nonzero

Return the indices of the non-zero elements of the input array.

ravel

Return a 1-D array containing the elements of the input array.

Examples

>>> x = np.arange(-2, 3)  
>>> x  
array([-2, -1,  0,  1,  2])
>>> np.flatnonzero(x)  
array([0, 1, 3, 4])

Use the indices of the non-zero elements as an index array to extract these elements:

>>> x.ravel()[np.flatnonzero(x)]  
array([-2, -1,  1,  2])

This docstring was copied from numpy.