A simple question about the getting results using Matlab engine.

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Gil 2013-3-7

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关闭： MATLAB Answer Bot 2021-8-20

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Hi,

I am trying the following simple code to compute the sum of two numbers:

         double *x;
   mxArray *m_X;
   m_X=mxCreateDoubleMatrix(1,1,mxREAL);
   x=new double();
   *x=3;
   memcpy((void *)mxGetPr(m_X),(void *)x,sizeof(double)*1);
   engPutVariable(ep,"x",m_X);
   double *s;
   mxArray *m_S;
   m_S=mxCreateDoubleMatrix(1,1,mxREAL);
   s=new double();
   *s=3;
   memcpy((void *)mxGetPr(m_S),(void *)s,sizeof(double)*1);
   engPutVariable(ep,"s",m_S);
   engEvalString(ep,"s=sum2(x,x)");
   double *cresult;
   mxArray *mresult;
   mresult=engGetVariable(ep,"s");
   cresult=new double();
   cresult=mxGetPr(mresult);

Notice I create another variable "s" and inject it into Matlab to store the results. Next, I try to call the function sum2 and store the results in "s" and then I try to get the value of "s" from Matlab. I expect the value of "s" to be 6, but it stays 3, the value it was initialized with.

What am I doing wrong? How can I get the result of calling the function "sum2" from Matlab?

Thank you,

Gil.