# How to bring differential equations to wanted value with DiffEqFlux?

**URL:** <https://discourse.julialang.org/t/how-to-bring-differential-equations-to-wanted-value-with-diffeqflux/54167>\
**Category:** Numerics\
**Tags:** question\
**Created:** [January 29, 2021, 7:15am UTC](https://discourse.julialang.org/t/how-to-bring-differential-equations-to-wanted-value-with-diffeqflux/54167 "2021-01-29T07:15:55Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![Luigi\_Marongiu](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/luigi_marongiu/32/7909_2.png) [@Luigi\_Marongiu](https://discourse.julialang.org/u/Luigi_Marongiu)\
**Post date:** [January 29, 2021, 8:17am UTC](https://discourse.julialang.org/t/how-to-bring-differential-equations-to-wanted-value-with-diffeqflux/54167/3 "2021-01-29T08:17:39Z")

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If the parameters are `μ, κ, φ, ω, η, β = p`, then no, I am not interested in that. I would like to know how many phages = Vp = u[3] I need to add and at what time point Tp in b1. As you can see in the other [post](https://discourse.julialang.org/t/how-to-bring-a-system-of-differential-equations-to-zero-with-differentialequations/53659/15) (of which the present post is, ideally, a more focused continuation) there is an amount of phage = u[3] that collapses u[1]. As you suggested, how do I train DiffEqFlux to use u[3] as such a parameter? and how do I tell DiffEqFlux to take into account also the time? Thanks

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