Introduction - If you have any usage issues, please Google them yourself
1. Function Select All PCA with Gaussian elimination method to calculate matrix A of rank (C language) 2. Function parameters double a [m] [n]: MXN-order matrix A storage elements will be destroyed upon return int m : Matrix A number of rows int n: matrix A the number of rows int rank (): function to return to A rank of 3. rank.c document describes procedures for the function-oriented function rank0.c procedures