由c语言编写的解非线性方程，线性方程组代码，包括LSQR,SIRT,SVD等算法源代码-By c language solution of nonlinear equations, linear equations code, including LSQR, SIRT, SVD algorithm source code, etc.

LSQR和SIRT和C语言程序，用于解方程组，迭代法。-the programe of LSQR and SIRT