Mex: Using arguments for definition an array

Question

mick strife 2013-4-20

0
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https://ww2.mathworks.cn/matlabcentral/answers/72899-mex-using-arguments-for-definition-an-array

Hello my friends :-)

I want to use the arguments from matlab in my mex/c-code and use them to define an array. Unfortunately an error appears. Can someone pls give a an advise for this problem? Many thanks for your help!

void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
 int sizeA;
   mxArray *arg;
   arg= prhs[0];
   sizeA = mxGetScalar(arg);
   int dim[3] = {100,3, sizeA}; // define array

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Answer 1

James Tursa 2013-4-20

1
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https://ww2.mathworks.cn/matlabcentral/answers/72899-mex-using-arguments-for-definition-an-array#answer_82920

编辑：James Tursa 2013-4-20

在 MATLAB Online 中打开

Some C compilers need to have all variable declarations first, before executable statements. So try this instead:

void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
 int sizeA;
     mxArray *arg; // variable declaration
     int dim[3] = {100,3, 0}; // variable declaration
     arg = prhs[0];
     sizeA = mxGetScalar(arg);
     dim[2] = sizeA;