code: public static void multAdd(double realAlpha , double imgAlpha , ZMatrixRMaj a , ZMatrixRMaj b , ZMatrixRMaj c )
      {
          if( b.numCols >= EjmlParameters.CMULT_COLUMN_SWITCH ) {
              MatrixMatrixMult_ZDRM.multAdd_reorder(realAlpha,imgAlpha,a,b,c);
          } else {
              MatrixMatrixMult_ZDRM.multAdd_small(realAlpha,imgAlpha,a,b,c);
          }
      }
docs: <p>
  Performs the following operation:<br>
  <br>
  c = c + &alpha; * a * b<br>
  c<sub>ij</sub> = c<sub>ij</sub> +  &alpha; * &sum;<sub>k=1:n</sub> { a<sub>ik</sub> * b<sub>kj</sub>}
  </p>
  
  @param realAlpha real component of scaling factor.
  @param imgAlpha imaginary component of scaling factor.
  @param a The left matrix in the multiplication operation. Not modified.
  @param b The right matrix in the multiplication operation. Not modified.
  @param c Where the results of the operation are stored. Modified.