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I have this error:

OpenCV Error: Assertion failed (type == B.type() && (type == CV_32FC1 || type == CV_64FC1 ||
type == CV_32FC2 || type == CV_64FC2)) in gemm, file /build/buildd/opencv-
2.3.1/modules/core/src/matmul.cpp, line 701 terminate called after throwing an instan
ce of 'cv::Exception' what(): /build/buildd/opencv-2.3.1/modules/core/
src/matmul.cpp:701: error: (-215) type == B.type() && (type == CV_32FC1 || 
type == CV_64FC1 || type == CV_32FC2 || type == CV_64FC2) in function gemm

I m sure is generated in a function I use because I used a print function after using that function. Originally what I have to do is translate to C with openCV this matlab's code:

function Xdecorr= color Decorrelation(X,numChannels)

if numChannels >1
mu=mean(X);
X=bsxfun(@minus,X,mu);
A=X'*X;
[V,D,notused]=svd(A);
Xdecorr=X*V;

else
 Xdecorr=Xdecorr;
end

I translated in C as:

  Mat colorDecorrelation(Mat img,int numColComp){

  Mat V,D,A,mu,Xdecorr,img_tr;
  SVD svd;

   if(numColComp>1){

    mu=mean(img);
    subtract(img,mu,img);
    transpose(img,img_tr);
        A = img_tr*img;
        V = svd(A).u;
        Xdecorr = img*V;
   }
   else
   Xdecorr = img;

    return Xdecorr;
    }

The error is for sure when I do : A=img_tr*img