Indexing routines

Generating index arrays

diag_indices(n[, ndim])	Return the indices to access the main diagonal of an array.
diag_indices_from(arr)	Return the indices to access the main diagonal of an n-dimensional array.
indices(dimensions[, dtype, sparse])	Return an array representing the indices of a grid.
nonzero(a)	Return the indices of the elements that are non-zero.
where(condition, [x, y])	Return elements chosen from x or y depending on condition.

Indexing-like operations

choose(a, choices[, out, mode])	Construct an array from an index array and a list of arrays to choose from.
compress(condition, a[, axis, out])	Return selected slices of an array along given axis.
diag(v[, k])	Extract a diagonal or construct a diagonal array.
diagonal(a[, offset, axis1, axis2])	Return specified diagonals.
take(a, indices[, axis, out, mode])	Take elements from an array along an axis.

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