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<>1.首先需要配置环境，从matlab的附加功能中下载 MinGW-w64 C/C++ Compiler
下载完成后用“ mex -setup”语句进行测试即可。
<>2.步骤
<>（1）先建立一个c文件，写代码，如下：
#include "mex.h" //(1)功能子程序。该过程包含了Mex文件实现计算功能的代码，是标准的C语言子程序。 double add(double
x, double y) { return x + y; }
//(2)入口子程序。该过程提供功能子程序与Matlab之间的接口，以mexFunction函数实现。
//注意，入口过程的名称必须是mexFunction，并且包含四个参数 //nrhs(left hand side): 输入参数的个数；
//prhs是一个输入数组，其内容为指针，指向mxArray类型的数据（MATLAB中所有数据都是以矩阵的形式mxArray保存的）。 //nlhs,
plhs含义类似。 void mexFunction(int nlhs,mxArray *plhs[], int nrhs,const mxArray *
prhs[]) { double * a; double b, c; plhs[0] = mxCreateDoubleMatrix(1, 1, mxREAL);
a= mxGetPr(plhs[0]); b = *(mxGetPr(prhs[0])); c = *(mxGetPr(prhs[1])); *a = add
(b, c); }
<>（2）通过执行 mex add.c生成add.mexw64文件即可在接下来的代码中直接调用函数add（x,y）
为啥用MATLAB执行C程序，因为在MATLAB中for循环太慢了，太慢了。。。基本上要慢7倍以上。
