无法构建mex文件

时间:2017-11-16 13:53:10

标签: c++ matlab

我已按照MATLAB示例从此处创建mex文件https://uk.mathworks.com/help/matlab/matlab_external/standalone-example.html

它产生的源代码如下

#include "mex.h"

/* The computational routine */
void arrayProduct(double x, double *y, double *z, mwSize n)
{
    mwSize i;
    /* multiply each element y by x */
    for (i=0; i<n; i++) {
        z[i] = x * y[i];
    }
}

/* The gateway function */
void mexFunction( int nlhs, mxArray *plhs[],
                  int nrhs, const mxArray *prhs[])
{
    double multiplier;              /* input scalar */
    double *inMatrix;               /* 1xN input matrix */
    size_t ncols;                   /* size of matrix */
    double *outMatrix;              /* output matrix */

    /* check for proper number of arguments */
    if(nrhs!=2) {
        mexErrMsgIdAndTxt("MyToolbox:arrayProduct:nrhs","Two inputs required.");
    }
    if(nlhs!=1) {
        mexErrMsgIdAndTxt("MyToolbox:arrayProduct:nlhs","One output required.");
    }
    /* make sure the first input argument is scalar */
    if( !mxIsDouble(prhs[0]) || 
         mxIsComplex(prhs[0]) ||
         mxGetNumberOfElements(prhs[0])!=1 ) {
        mexErrMsgIdAndTxt("MyToolbox:arrayProduct:notScalar","Input multiplier must be a scalar.");
    }

    /* make sure the second input argument is type double */
    if( !mxIsDouble(prhs[1]) || 
         mxIsComplex(prhs[1])) {
        mexErrMsgIdAndTxt("MyToolbox:arrayProduct:notDouble","Input matrix must be type double.");
    }

    /* check that number of rows in second input argument is 1 */
    if(mxGetM(prhs[1])!=1) {
        mexErrMsgIdAndTxt("MyToolbox:arrayProduct:notRowVector","Input must be a row vector.");
    }

    /* get the value of the scalar input  */
    multiplier = mxGetScalar(prhs[0]);

    /* create a pointer to the real data in the input matrix  */
    inMatrix = mxGetPr(prhs[1]);

    /* get dimensions of the input matrix */
    ncols = mxGetN(prhs[1]);

    /* create the output matrix */
    plhs[0] = mxCreateDoubleMatrix(1,(mwSize)ncols,mxREAL);

    /* get a pointer to the real data in the output matrix */
    outMatrix = mxGetPr(plhs[0]);

    /* call the computational routine */
    arrayProduct(multiplier,inMatrix,outMatrix,(mwSize)ncols);
}

当我运行命令mex arrayProduct.cpp(我的文件名)时,出现以下错误:

  

使用'Microsoft Visual C ++ 2017'构建。   使用mex时出错   链接:错误LNK2001:未解析的外部符号mexfilerequiredapiversion   arrayProduct.lib:致命错误LNK1120:1个未解析的外部

我正在使用MATLAB 2015b 32位,使用Visual Studio 2017 C ++编译器。制作mex文件是否需要一些初步设置,而MATLAB教程中没有提到这些文件?

1 个答案:

答案 0 :(得分:1)

youngest supported compiler for MATLAB R2015b是MSVC Professional 2015.此外,R2015b is the latest version with 32-bit support。您的编译器可能是MSVC 2017,64位。

尝试安装.NET4 + SDK 7.1,在MATLAB中选择它,然后重新运行mex命令。这是一个官方支持的R2015b编译器,我希望这能解决你的问题。

注意:对我来说,.NET4拒绝安装,因为它检测到以前安装的框架,但this answer为我解决了这个问题。