Question

从matlab调用c函数我遇到了很多麻烦。

我的c功能很简单

test.c的

#include "mex.h"

int addOne(int a)
{
    return a+1;
}

我在matlab命令窗口输入mex test.c，我收到此错误信息

Undefined symbols for architecture x86_64:
  "_mexFunction", referenced from:
     -exported_symbol[s_list] command line option
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

    mex: link of ' "test.mexmaci64"' failed.

My Matlab是2013a，osx 10.9，xcode 5.02

有人对此有所了解吗？感谢。

Answer 1

这是一个让你入门的简单例子：

addOne.cpp

#include "mex.h"

double addOne(double a)
{
    return a+1;
}

void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
    if (nrhs!=1 || nlhs>1) mexErrMsgIdAndTxt("mex:error", "Wrong num of args");
    if (!mxIsDouble(prhs[0])) mexErrMsgIdAndTxt("mex:error", "Not double");

    plhs[0] = mxDuplicateArray(prhs[0]);

    double *x = mxGetPr(plhs[0]);
    size_t len = mxGetNumberOfElements(plhs[0]);
    for (size_t i=0; i<len; ++i) {
        x[i] = addOne(x[i]);
    }
}

MATLAB：

>> mex -largeArrayDims addOne.cpp
>> x = magic(4)
x =
    16     2     3    13
     5    11    10     8
     9     7     6    12
     4    14    15     1
>> addOne(x)
ans =
    17     3     4    14
     6    12    11     9
    10     8     7    13
     5    15    16     2

从matlab调用c函数

1 个答案:

addOne.cpp

MATLAB：