# Operation error in problem definition

**URL:** <https://community.freefem.org/t/operation-error-in-problem-definition/466>\
**Category:** General Discussion\
**Created:** [June 13, 2020, 1:50pm UTC](https://community.freefem.org/t/operation-error-in-problem-definition/466 "2020-06-13T13:50:31Z")\
**Posts on this page:** 1\
**Page:** 2

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**Author:** ![sumantkr](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/sumantkr/32/2681_2.png) [@sumantkr](https://community.freefem.org/u/sumantkr)\
**Post date:** [September 15, 2021, 2:16pm UTC](https://community.freefem.org/t/operation-error-in-problem-definition/466/21 "2021-09-15T14:16:52Z")

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I found the method for Newton method implemented in the example

[https://www.ljll.math.upmc.fr/hecht/ftp/ff++/2018-XVIII-las-Palmas/edp-XVIII/04Rayleigh-Benard.edp](https://www.ljll.math.upmc.fr/hecht/ftp/ff++/2018-XVIII-las-Palmas/edp-XVIII/04Rayleigh-Benard.edp)

is much more better than the example mentioned in

[https://www.um.es/freefem/ff++/pmwiki.php?n=Main.Newton2](https://www.um.es/freefem/ff++/pmwiki.php?n=Main.Newton2)

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