numpy.unravel_index

numpy.unravel_index(indices, shape, order='C')

Converts a flat index or array of flat indices into a tuple of coordinate arrays.

Parameters:

indices : array_like An integer array whose elements are indices into the flattened version of an array of dimensions shape. Before version 1.6.0, this function accepted just one index value. shape : tuple of ints The shape of the array to use for unraveling indices. Changed in version 1.16.0: Renamed from dims to shape. order : {‘C’, ‘F’}, optional Determines whether the indices should be viewed as indexing in row-major (C-style) or column-major (Fortran-style) order. New in version 1.6.0.

Returns:

unraveled_coords : tuple of ndarray Each array in the tuple has the same shape as the indices array.

See also

ravel_multi_index

Examples

>>> np.unravel_index([22, 41, 37], (7,6))
(array([3, 6, 6]), array([4, 5, 1]))
>>> np.unravel_index([31, 41, 13], (7,6), order='F')
(array([3, 6, 6]), array([4, 5, 1]))

>>> np.unravel_index(1621, (6,7,8,9))
(3, 1, 4, 1)