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Question about default value of `reltol` #326

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navidcy opened this issue Sep 4, 2022 · 0 comments

navidcy commented Sep 4, 2022 •

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I have a question. Why is the default value of reltol often picked as sqrt(eps) and not e.g. eps? Is there a particular reason?

IterativeSolvers.jl/src/cg.jl

Line 122 in 40d9e9d

reltol::Real = sqrt(eps(real(eltype(b)))),

cc @elise-palethorpe

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