docs: public static void multAdd(DMatrix1Row A , DMatrixD1 B , DMatrixD1 C )
      {
          if( B.numRows == 1 ) {
              if( A.numCols != B.numCols ) {
                  throw new MatrixDimensionException("A and B are not compatible");
              }
          } else if( B.numCols == 1 ) {
              if( A.numCols != B.numRows ) {
                  throw new MatrixDimensionException("A and B are not compatible");
              }
          } else {
              throw new MatrixDimensionException("B is not a vector");
          }
          C.reshape(A.numRows,1);
  
          if( A.numCols == 0 ) {
              return;
          }
  
          int indexA = 0;
          int cIndex = 0;
          for( int i = 0; i < A.numRows; i++ ) {
              double total = A.get(indexA++) * B.get(0);
  
              for( int j = 1; j < A.numCols; j++ ) {
                  total += A.get(indexA++) * B.get(j);
              }
  
              C.plus(cIndex++ , total );
          }
      }