docs: public static double dot(DMatrixD1 a , DMatrixD1 b ) {
          if( !MatrixFeatures_DDRM.isVector(a) || !MatrixFeatures_DDRM.isVector(b))
              throw new RuntimeException("Both inputs must be vectors");
  
          return VectorVectorMult_DDRM.innerProd(a,b);
      }