Handle zero right hand side in CG and GMRES

2026-04-10 11:34:33 +08:00 · 2013-03-20 11:22:45 +01:00
parent 9bfeeba1c5
commit 4107b371e3
2 changed files with 8 additions and 1 deletions
--- a/unsupported/Eigen/src/IterativeSolvers/GMRES.h
+++ b/unsupported/Eigen/src/IterativeSolvers/GMRES.h
@@ -348,7 +348,8 @@ public:
  template<typename Rhs,typename Dest>
  void _solve(const Rhs& b, Dest& x) const
  {
-    x.setZero();
+    x = b;
+    if(!x.squaredNorm()) return; // Check Zero right hand side
    _solveWithGuess(b,x);
  }