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More precise power method at start

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This commit is contained in:
Peter Boyle 2020-02-06 10:09:14 -05:00
parent 2f421a5db1
commit b9ca40cc44
1 changed files with 4 additions and 1 deletions
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5
Grid/algorithms/iterative/ImplicitlyRestartedLanczos.h
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@ -377,14 +377,17 @@ until convergence
{ {
auto src_n = src; auto src_n = src;
auto tmp = src; auto tmp = src;
std::cout << GridLogIRL << " IRL source norm " << norm2(src) << std::endl;
const int _MAX_ITER_IRL_MEVAPP_ = 50; const int _MAX_ITER_IRL_MEVAPP_ = 50;
for (int i=0;i<_MAX_ITER_IRL_MEVAPP_;i++) { for (int i=0;i<_MAX_ITER_IRL_MEVAPP_;i++) {
normalise(src_n); normalise(src_n);
_HermOp(src_n,tmp); _HermOp(src_n,tmp);
// std::cout << GridLogMessage<< tmp<<std::endl; exit(0);
// std::cout << GridLogIRL << " _HermOp " << norm2(tmp) << std::endl;
RealD vnum = real(innerProduct(src_n,tmp)); // HermOp. RealD vnum = real(innerProduct(src_n,tmp)); // HermOp.
RealD vden = norm2(src_n); RealD vden = norm2(src_n);
RealD na = vnum/vden; RealD na = vnum/vden;
if (fabs(evalMaxApprox/na - 1.0) < 0.05) if (fabs(evalMaxApprox/na - 1.0) < 0.0001)
i=_MAX_ITER_IRL_MEVAPP_; i=_MAX_ITER_IRL_MEVAPP_;
evalMaxApprox = na; evalMaxApprox = na;
std::cout << GridLogIRL << " Approximation of largest eigenvalue: " << evalMaxApprox << std::endl; std::cout << GridLogIRL << " Approximation of largest eigenvalue: " << evalMaxApprox << std::endl;