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KSP: check -ksp_initial_guess_nonzero first

Merged Pierre Jolivet requested to merge jolivet/fix-preonly-nonzero-initial-guess into release

This otherwise triggers a faulty Running KSP of preonly doesn't make sense with nonzero initial guess you probably want a KSP type of Richardson.

See also: https://community.freefem.org/t/initial-guess-for-a-petsc-solver/1213/5.

Edited by Pierre Jolivet

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