# \*static linear and nonlinear with Newton-Raphson method

**URL:** <https://calculix.discourse.group/t/static-linear-and-nonlinear-with-newton-raphson-method/378>\
**Category:** Uncategorized\
**Created:** [January 3, 2021, 6:15pm UTC](https://calculix.discourse.group/t/static-linear-and-nonlinear-with-newton-raphson-method/378 "2021-01-03T18:15:57Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![dichtstoff](https://avatars.discourse-cdn.com/v4/letter/d/dec6dc/32.png) [@dichtstoff](https://calculix.discourse.group/u/dichtstoff)\
**Post date:** [January 3, 2021, 6:15pm UTC](https://calculix.discourse.group/t/static-linear-and-nonlinear-with-newton-raphson-method/378/1 "2021-01-03T18:15:57Z")

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Hello,  
it these correct, that if i do a static calculation, a linear or a nonlinear,  
the Newton-Raphson method is applied for convergence criteria ?

wbr dichtstoff

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**Author:** ![dichtstoff](https://avatars.discourse-cdn.com/v4/letter/d/dec6dc/32.png) [@dichtstoff](https://calculix.discourse.group/u/dichtstoff)\
**Post date:** [January 8, 2021, 9:00am UTC](https://calculix.discourse.group/t/static-linear-and-nonlinear-with-newton-raphson-method/378/2 "2021-01-08T09:00:21Z")

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hello,

is it possible,  
to use ccx with the Arc Length Method ?

wbr dichtstoff

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**Author:** ![xyont](https://yyz2.discourse-cdn.com/free1/user_avatar/calculix.discourse.group/xyont/32/3553_2.png) [@xyont](https://calculix.discourse.group/u/xyont)\
**Post date:** [January 11, 2021, 2:13pm UTC](https://calculix.discourse.group/t/static-linear-and-nonlinear-with-newton-raphson-method/378/3 "2021-01-11T14:13:12Z")

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as i know Riks method is not yet implemented, it’s on the list of [schedule](http://dhondt.de/pre_calc.htm).

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**Author:** ![Matej](https://avatars.discourse-cdn.com/v4/letter/m/a698b9/32.png) [@Matej](https://calculix.discourse.group/u/Matej)\
**Post date:** [January 12, 2021, 9:20pm UTC](https://calculix.discourse.group/t/static-linear-and-nonlinear-with-newton-raphson-method/378/4 "2021-01-12T21:20:41Z")

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I would greatly support the implementation of the Riks method 🙂 And I think that other users are also waiting on it.

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<div class="post-metadata">

**Author:** ![dichtstoff](https://avatars.discourse-cdn.com/v4/letter/d/dec6dc/32.png) [@dichtstoff](https://calculix.discourse.group/u/dichtstoff)\
**Post date:** [January 12, 2021, 9:42pm UTC](https://calculix.discourse.group/t/static-linear-and-nonlinear-with-newton-raphson-method/378/5 "2021-01-12T21:42:19Z")

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can we support them for implementation of the Riks method ?  
Are arc-length and riks method the same ?  
wbr dichtstoff