Esempio n. 1
0
  void MultiVectorMatrix::MultVectorImpl(Number alpha, const Vector &x,
                                         Number beta, Vector &y) const
  {
    //  A few sanity checks
    DBG_ASSERT(NCols()==x.Dim());
    DBG_ASSERT(NRows()==y.Dim());

    // Take care of the y part of the addition
    if ( beta!=0.0 ) {
      y.Scal(beta);
    }
    else {
      y.Set(0.0);  // In case y hasn't been initialized yet
    }

    // See if we can understand the data
    const DenseVector* dense_x = static_cast<const DenseVector*>(&x);
    DBG_ASSERT(dynamic_cast<const DenseVector*>(&x));

    // We simply add all the Vectors one after the other
    if (dense_x->IsHomogeneous()) {
      Number val = dense_x->Scalar();
      for (Index i=0; i<NCols(); i++) {
        y.AddOneVector(alpha*val, *ConstVec(i), 1.);
      }
    }
    else {
      const Number* values = dense_x->Values();
      for (Index i=0; i<NCols(); i++) {
        y.AddOneVector(alpha*values[i], *ConstVec(i), 1.);
      }
    }
  }
Esempio n. 2
0
  void MultiVectorMatrix::LRMultVector(Number alpha, const Vector &x,
                                       Number beta, Vector &y) const
  {
    DBG_START_METH("MultiVectorMatrix::LRMultVector(",
                   dbg_verbosity);

    DBG_ASSERT(NRows()==x.Dim());
    DBG_ASSERT(NRows()==y.Dim());

    DBG_PRINT((1, "alpha = %e beta = %e\n", alpha, beta));
    DBG_PRINT_VECTOR(2, "x", x);

    if ( beta!=0.0 ) {
      y.Scal(beta);
    }
    else {
      y.Set(0.0);
    }

    DBG_PRINT_VECTOR(2, "beta*y", y);
    for (Index i=0; i<NCols(); i++) {
      DBG_PRINT_VECTOR(2, "ConstVec(i)", *ConstVec(i));
      y.AddOneVector(alpha*ConstVec(i)->Dot(x), *ConstVec(i), 1.);
      DBG_PRINT_VECTOR(2, "y mid", y);
    }
  }