# Tag Info

### Global convergence behavior of several Krylov solvers in scipy.opt

Try bicgstab, not cgs. Be careful with tol and atol; what values did you use ? SVD of your various solutions, matrices say <...
• 892
The object to analyze is the step Jacobian $$I+J_k\,dt.$$ $J_k$ should correctly be $\nabla_x\Phi_F(t_k,x_k,dt)$, the Jacobian of the step update $x_k+\Phi_F(t_k,x_k,dt)\,dt$, but in a pinch can be ...