# How to only return values from the last time step in a saving callback?

**URL:** <https://discourse.julialang.org/t/how-to-only-return-values-from-the-last-time-step-in-a-saving-callback/41276>\
**Category:** General Usage\
**Tags:** diffeq\
**Created:** [June 12, 2020, 4:01pm UTC](https://discourse.julialang.org/t/how-to-only-return-values-from-the-last-time-step-in-a-saving-callback/41276 "2020-06-12T16:01:02Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![HelgavonLichtenstein](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/helgavonlichtenstein/32/5005_2.png) [@HelgavonLichtenstein](https://discourse.julialang.org/u/HelgavonLichtenstein)\
**Post date:** [June 12, 2020, 4:01pm UTC](https://discourse.julialang.org/t/how-to-only-return-values-from-the-last-time-step-in-a-saving-callback/41276/1 "2020-06-12T16:01:02Z")

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I’ve tried these combinations and haven’t found the correct one yet.

```julia
cb_save = SavingCallback(saving_func, saved_values, saveat=sol.t[end])

cb_save = SavingCallback(saving_func, saved_values, save_start=false,save_everystep=false)

tmin = 0.0
tmax = 50000.0
tspan = (tmin,tmax)

cb_save = SavingCallback(saving_func, saved_values, saveat=tmax)

```

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<div class="post-metadata">

**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:** [June 13, 2020, 7:47am UTC](https://discourse.julialang.org/t/how-to-only-return-values-from-the-last-time-step-in-a-saving-callback/41276/2 "2020-06-13T07:47:05Z")

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That was a bug in the library.

> <https://github.com/SciML/DiffEqCallbacks.jl/pull/81>

Patch will be out tomorrow morning.