int SNESSetMatrixFreeParameters(SNES snes,double error,double umin)Collective on SNES
snes | - the SNES context |
error_rel | - relative error (should be set to the square root of the relative error in the function evaluations) |
umin | - minimum allowable u-value |
J(u)*a = [J(u+h*a) - J(u)]/h where h = error_rel*u'a/||a||^2 if |u'a| > umin*||a||_{1} = error_rel*umin*sign(u'a)*||a||_{1}/||a||^2 else
-snes_mf_err <error_rel> | - Sets error_rel |
-snes_mf_unim <umin> | - Sets umin |
Location: src/snes/interface/snesmfj.c
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