如何将整数数组从Matlab传递给mex? [英] How to pass an integer array from matlab to mex?

问题描述

我想将整数数组从matlab传递给mex.例如，该数组是a=[1 2 3 4].我编写了以下代码:

I want to pass an integer array from matlab to mex. The array is for example a=[1 2 3 4]. I wrote the following code:

#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <mkl.h>
#include "mkl_vml.h"
#include "mex.h"
#include "matrix.h"
#include "mkl_vsl.h"


/* main fucntion */
void mexFunction(int nlhs,  mxArray *plhs[], int nrhs, const mxArray *prhs[])
{

    int n, *a;

    /* make pointers to input data */
    n = (int)mxGetScalar(prhs[0]);
    a = (int *)mxGetData(prhs[1]);

    mexPrintf("a[0]:%d \t a[1]:%d \t a[2]:%d \n", a[0],a[1],a[2]);

}

当我运行它时，结果是:

When I run it the result is:

a[0]:0   a[1]:1072693248     a[2]:0 

我已经看到了这个答案:在mex上使用整数数组，但我没有不知道该怎么办.

I've seen this answer : using integer arrays on mex but I haven't understood what to do.

任何帮助将不胜感激.

推荐答案

在决定如何传递数据时，这里的表具有等效的C和MATLAB数据类型.

Here's a table is of equivalent C and MATLAB data types to use when deciding how to pass data.

来源

由于您正在处理MEX文件中的int *，因此您应该传递int32 MATLAB数据.但是请注意，C语言中的int不能保证为32位，但在现代系统中似乎是如此.

Since you are dealing with an int * in the MEX file, you should be passing int32 MATLAB data. Note however that int in C is not guaranteed to be 32-bit, but seems to be so on modern systems.

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