# DifferentialEquations.jl saving data without redundant calculation of control inputs

**URL:** <https://discourse.julialang.org/t/differentialequations-jl-saving-data-without-redundant-calculation-of-control-inputs/62559>\
**Category:** General Usage\
**Tags:** diffeq\
**Created:** [June 8, 2021, 4:27am UTC](https://discourse.julialang.org/t/differentialequations-jl-saving-data-without-redundant-calculation-of-control-inputs/62559 "2021-06-08T04:27:06Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![jonniedie](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/jonniedie/32/12842_2.png) [@jonniedie](https://discourse.julialang.org/u/jonniedie)\
**Post date:** [June 8, 2021, 3:55pm UTC](https://discourse.julialang.org/t/differentialequations-jl-saving-data-without-redundant-calculation-of-control-inputs/62559/6 "2021-06-08T15:55:46Z")

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Ah, I see. Unfortunately, since your dynamics function is being called by the solver multiple times per simulation time step, the random values generated while logging will get out of sync with those generated during the initial simulation. I’m not sure what the right solution is here.

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