www.alglib.net/matrixops/general/svd.php>.
% Among them, Lapack's SVD focuses the smallest singular value.
% The following example is to see the small singular values as in
% <http://www.netlib.org/lapack/lawnspdf/lawn03.pdf>:

%%
% Generate a matrix A:
eta = eps(1)/2;
x = eta; % the smallest sigma ~ eta^3 
%x = 0; % the smallest sigma ~ eta^2/sqrt(2) % good test for deflation
A = [eta^2 1 0 0; 0 1 x 0; 0 0 1 1; 0 0 0 eta^2];

%%
% Change format:
format long g

%%
% Calculate SVD using ZGES