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Improve BiCGSTAB : With exact preconditioner, the solution should be found in one iteration

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Desire NUENTSA 2012-09-19 18:32:02 +02:00
parent 48c4d48aec
commit 7e0dd17312
1 changed files with 4 additions and 2 deletions
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6
Eigen/src/IterativeLinearSolvers/BiCGSTAB.h
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@ -39,10 +39,11 @@ bool bicgstab(const MatrixType& mat, const Rhs& rhs, Dest& x,
int maxIters = iters;
int n = mat.cols();
x = precond.solve(x);
VectorType r = rhs - mat * x;
VectorType r0 = r;
RealScalar r0_sqnorm = r0.squaredNorm();
RealScalar r0_sqnorm = rhs.squaredNorm();
Scalar rho = 1;
Scalar alpha = 1;
Scalar w = 1;
@ -223,7 +224,8 @@ public:
template<typename Rhs,typename Dest>
void _solve(const Rhs& b, Dest& x) const
{
x.setZero();
// x.setZero();
x = b;
_solveWithGuess(b,x);
}