p://www.netlib.org/lapack/lawnspdf/lawn03.pdf>. 
% * DLARTG generates a plane rotation with real cosine and real sine.
% * ZDROT applies a plane rotation, where the cos and sin (c and s) are real
% and the vectors cx and cy are complex.
% * ZLASR applies a sequence of plane rotations to a general rectangular matrix.
% simplified version needed to compare with.

%%
% The source of ZGESDD can be found at
% <http://www.netlib.org/lapack/explore-html/d8/d54/zgesdd_8f_source.html>.
% ZGESDD calls a sub