C++ (Cpp) VectorT::setRef Exemples

Exemple #1

void QRDecomposition<T>::leastSquares(const VectorT& b, VectorT& x, VectorT& residual) const
{
  if(x.n == 0) x.resize(QR.n);
  Assert(QR.m >= QR.n);
  Assert(QR.m == b.n);
  Assert(QR.n == x.n);
  Assert(QR.m == residual.n);

  MatrixT R;
  R.setRef(QR,0,0,1,1,QR.n,QR.n);
  VectorT c;
  c.setRef(residual,0,1,QR.n);

  /* compute rhs = Q^T b */ 
  QtMul(b,residual);
  
  /* Solve R x = rhs */
  UBackSubstitute(R,c,x);
  
  /* Compute residual = b - A x = Q (Q^T b - R x) */
  c.setZero();
  QMul(residual,residual);
}