Givens matrix operations routines.

void mx_givens(real x, real y, real* c, real* s)

Returns c, s parameters for Givens rotation to eliminate y in the vector [ x y ]'

void mx_rot_vec(Vec* x, int i, int k, real c, real s, Vec* out)

Apply Givens rotation to x's i and k components

void mx_rot_rows(Mat* mat, int i, int k, real c, real s, Mat* out)

Premultiply mat by givens rotation described by c,s

void mx_rot_cols(Mat* mat, int i, int k, real c, real s, Mat* out)

Postmultiply mat by givens rotation described by c,s

Documentation

Givens matrix operations routines. Routines for calculating and applying Givens rotations for/to vectors and also to matrices by row and by column.

Based on the "Meschach Library", available at the anonymous ftp site thrain.anu.edu.au in the directory pub/meschach.

Author:

David E. Stewart (david.stewart@anu.edu.au) Zbigniew Leyk (zbigniew.leyk@anu.edu.au) Ronan Collobert (collober@idiap.ch)

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