压缩感知作为一个新起的采样理论，核心是求欠定方程组的稀疏解。本文件通过自定义一个TL0罚函数，用阈值迭代算法，在matlab工作环境里求出最优解-Compressed sensing as a new starting sampling theory, the core is seeking sparse solution underdetermined equations. This document is by custom a TL0 penalty function threshold

用共轭梯度法求解方程组、一种最优化方法（适用于求解超定、欠定方程组）-Conjugate gradient method for solving equations, an optimization method (for solving overdetermined, underdetermined equations)

利用解优化问题解欠定方程组的matlab程序例子(The MATLAB programming example of solving underdetermined equations by solving optimization problems is given)

Kaczmarz_Algorithm算法迭代求解方程，适用于欠定和超定方程组(Kaczmarz_Algorithm. Iterative solution of equations is applicable to underdetermined and overdetermined equations.)