_fgmres(matvec, v0, m, atol, lpsolve=None, rpsolve=None, cs=(), outer_v=(), prepend_outer_v=False)
Operation A*x
Initial vector, normalized to nrm2(v0) == 1
Number of GMRES rounds
Absolute tolerance for early exit
Left preconditioner L
Right preconditioner R
Columns of matrices C and U in GCROT
Augmentation vectors in LGMRES
Whether augmentation vectors come before or after Krylov iterates
If nans encountered
QR decomposition of the upper Hessenberg H=QR
Projections corresponding to matrix C
Columns of matrix V
Columns of matrix Z
Solution to ||H y - e_1||_2 = min!
The final (preconditioned) residual norm
FGMRES Arnoldi process, with optional projection or augmentation
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