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Dealing with the main diagonal / triangles of a matrix
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Questions to David Rotermund
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numpy.fill_diagonal
numpy.fill_diagonal(a, val, wrap=False)
Fill the main diagonal of the given array of any dimensionality.
For an array a with a.ndim >= 2, the diagonal is the list of locations with indices a[i, ..., i] all identical. This function modifies the input array in-place, it does not return a value.
numpy.diag_indices
numpy.diag_indices(n, ndim=2)
Return the indices to access the main diagonal of an array.
This returns a tuple of indices that can be used to access the main diagonal of an array a with a.ndim >= 2 dimensions and shape (n, n, …, n). For a.ndim = 2 this is the usual diagonal, for a.ndim > 2 this is the set of indices to access a[i, i, ..., i] for i = [0..n-1].
numpy.diag_indices_from
numpy.diag_indices_from(arr)
Return the indices to access the main diagonal of an n-dimensional array.