algebraic multigrid linear solver

This program solves Ax=b where A is an M-matrix. A test case can be found at AMG_test.m

The program is implemented based on Ruge and Stuben's algorithm in 86. There are a set of parameters that users can tune for their own applications including connection threshold, relaxation parameters, type of smoother and number of smoothing steps, etc. The users are welcome to modify this code. However, the author makes no warranty at all. please let me know if there is any error in the code. Thank you very much.