On Wed, Nov 13, 2024 at 4:25 PM Patrick Dupre <pdupre@xxxxxxx> wrote: > > > > > How different are the values? How many significant figures match? 0? 5? > relatve difference: 2.7e-8 > "noise" ~ 1e-35 > values < 2e-23 > What significant figure is it of the result? Heavy calculations are sensitive to the precision of the underlying cpu calculations and one cpu may pick a different underlying precision to use internally. Ie if one machine takes say 3 clock cycles to do a single or a double then you might as well use a double internally and if the other machine takes say 3 for a single and 6 for a double then on that machine the compiler optimization will choose the single (to be faster) and both may produce a different answer. And likely NEITHER answer is mathematically exact and/or could even be correct especially if the calculation is done in the wrong order that causes significant sensitivities to underlying precision used by the computer and/or cpu. -- _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
