资源简介
Lansvd奇异值分解，先对矩阵进行Lanczos分解，得到双对角矩阵，再进行奇异值分解。
代码片段和文件信息
function [USVbndj] = lansvd（varargin）
%LANSVD Compute a few singular values and singular vectors.
% LANSVD computes singular triplets （uvsigma） such that
% A*u = sigma*v and A‘*v = sigma*u. Only a few singular values
% and singular vectors are computed using the Lanczos
% bidiagonalization algorithm with partial reorthogonalization （BPRO）.
%
% S = LANSVD（A）
% S = LANSVD（‘Afun‘‘Atransfun‘MN）
%
% The first input argument is either a matrix or a
% string containing the name of an M-file which applies a linear
% operator to the columns of a given matrix. In the latter case
% the second input must be the name of an M-file which applies the
% transpose of the same operator to the columns of a given matrix
% and the third and fourth a
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