NumPy

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
indicesarray_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.

shapetuple 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_coordstuple of ndarray

Each array in the tuple has the same shape as the indices array.

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)

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