`numpy:ravel_multi_index`

Signature

def ravel_multi_index ( multi_index , dims , mode = raise , order = C )

Summary

Converts a tuple of index arrays into an array of flat indices, applying boundary modes to the multi-index.

Parameters

multi_index : tuple of array_like

A tuple of integer arrays, one array for each dimension.

dims : tuple of ints

The shape of array into which the indices from multi_index apply.

mode : {'raise', 'wrap', 'clip'}, optional

Specifies how out-of-bounds indices are handled. Can specify either one mode or a tuple of modes, one mode per index.

'raise' -- raise an error (default)
'wrap' -- wrap around
'clip' -- clip to the range

In 'clip' mode, a negative index which would normally wrap will clip to 0 instead.

order : {'C', 'F'}, optional

Determines whether the multi-index should be viewed as indexing in row-major (C-style) or column-major (Fortran-style) order.

Returns

raveled_indices : ndarray: An array of indices into the flattened version of an array of dimensions dims.

Examples

import numpy as np
arr = np.array([[3,6,6],[4,5,1]])
np.ravel_multi_index(arr, (7,6))
np.ravel_multi_index(arr, (7,6), order='F')
np.ravel_multi_index(arr, (4,6), mode='clip')
np.ravel_multi_index(arr, (4,4), mode=('clip','wrap'))

✓

np.ravel_multi_index((3,1,4,1), (6,7,8,9))

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Aliases