matlab实现lsqr算法的源码，有强烈的参考价值，可用于地球物理反演。-matlab realize lsqr algorithm source code, there is a strong reference value, can be used for geophysical inversion.

最小二乘matlab算法，可以直接调用，用于数学算法，稀疏变换，求解等需要用到- Matlab least squares algorithm, can be called directly for mathematical algorithms, sparse transformation, such as the need to use to solve

可用于求解超大规模线性方程组非负解的MATLAB函数-Given a tall full-rank matrix A, solves the nonnegative least squares problem: min ||Ax-b|| s.t. x>= 0 and returns the minimizer x. The argument err is the tolerance used in testing for zeros