The matrix has the structure:
[ S ] [ D ]
Where S is an upper triangular matrix with shape (n, n) and D is a diagonal matrix with shape (n, n) with elements from :None:None:`diag`. This function applies Givens rotations to it such that the resulting matrix has zeros in place of D.
Array :None:None:`S` will be modified in-place.
Array :None:None:`v` of shape (n,) is the part of the full vector with shape (2*n,):
[ v ] [ 0 ]
to which Givens rotations are applied. This array is modified in place, such that on exit it contains the first n components of the above mentioned vector after rotations were applied.
Zero out a diagonal block of a matrix by series of Givens rotations.
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