# ODE with vector Argument

**URL:** <https://discourse.julialang.org/t/ode-with-vector-argument/64918>\
**Category:** New to Julia\
**Created:** [July 19, 2021, 10:28am UTC](https://discourse.julialang.org/t/ode-with-vector-argument/64918 "2021-07-19T10:28:46Z")\
**Posts on this page:** 1\
**Showing post:** 2

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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:** [July 19, 2021, 10:32am UTC](https://discourse.julialang.org/t/ode-with-vector-argument/64918/2 "2021-07-19T10:32:17Z")

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> [@aiiiob\_bie](#):
>
> dx[1]

That variable doesn’t exist. Why not just write `du[1] = x[2]`?

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