docs: public static void mult(double alpha , DMatrix1Row a , DMatrix1Row b , DMatrix1Row c )
      {
          // TODO add a matrix vectory multiply here
          if( b.numCols >= EjmlParameters.MULT_COLUMN_SWITCH ) {
              MatrixMatrixMult_DDRM.mult_reorder(alpha, a, b, c);
          } else {
              MatrixMatrixMult_DDRM.mult_small(alpha,a,b,c);
          }
      }