docs: public T kron( T B ) {
          convertType.specify(this,B);
          T A = convertType.convert(this);
          B = convertType.convert(B);
  
          T ret = A.createMatrix(mat.getNumRows()*B.numRows(),mat.getNumCols()*B.numCols(), A.getType());
  
          A.ops.kron(A.mat,B.mat,ret.mat);
  
          return ret;
      }