# ForwardDiff & "complicated" functions?

**URL:** <https://discourse.julialang.org/t/forwarddiff-complicated-functions/31094>\
**Category:** General Usage\
**Created:** [November 14, 2019, 5:59pm UTC](https://discourse.julialang.org/t/forwarddiff-complicated-functions/31094 "2019-11-14T17:59:02Z")\
**Posts on this page:** 1\
**Showing post:** 13

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**Author:** ![ChrisRackauckas](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/chrisrackauckas/32/77_2.png) [@ChrisRackauckas](https://discourse.julialang.org/u/ChrisRackauckas)\
**Post date:** [November 15, 2019, 3:50pm UTC](https://discourse.julialang.org/t/forwarddiff-complicated-functions/31094/13 "2019-11-15T15:50:08Z")

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Oh yes, if your parameters are like that you can use ModelingToolkit to derive the Jacobian, but the automatic version needs some work to handle your case.

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