# Use of caveat in common solve
**URL:** https://discourse.julialang.org/t/use-of-caveat-in-common-solve/93243
**Category:** General Usage
**Created:** [January 20, 2023, 1:51am UTC](https://discourse.julialang.org/t/use-of-caveat-in-common-solve/93243 "2023-01-20T01:51:46Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@erlebach](https://discourse.julialang.org/u/erlebach)
#### Post date: [January 20, 2023, 1:51am UTC](https://discourse.julialang.org/t/use-of-caveat-in-common-solve/93243/1 "2023-01-20T01:51:46Z")
@ChrisRackauckas,
I get the error message:
```julia
┌ Warning: Endpoints do not match. Return code: Success. Likely your time range is not a multiple of `saveat`. sol.t[end]: 75.398224, ts[end]: 0.0
```
because I am using `saveat` as an integer to represent the number of times to save the solution when calling `solve` after calling `ODEProblem`.
```julia
dudt_ude!(du,u,p,t) = dudt_univ!(du,u,p,t,protocols[k], dct)
prob_univ = ODEProblem(dudt_ude!, σ0, tspan, θ0)
saveat = dct[:pts_per_cycle] * dct[:Ncycles] # an integer
println("saveat 2: ", saveat)]
sol_pre = solve(prob_univ, Tsit5(),abstol = 1e-8, reltol = 1e-6, saveat=saveat)
```
What conditions must be satisfied for the warning error not to occur?
The end time is some real number based on \pi so the end time is irrational.
Thanks,
---
### Author:  [@contradict](https://discourse.julialang.org/u/contradict)
#### Post date: [January 20, 2023, 5:18pm UTC](https://discourse.julialang.org/t/use-of-caveat-in-common-solve/93243/2 "2023-01-20T17:18:57Z")
`saveat` as a number expands to `tspan[1]:saveat:tspan[2]`, so it should be the interval between saves, not the number of saves. In you case maybe `saveat=2π/dct[:pts_per_cycle]`?
---
### Author:  [@erlebach](https://discourse.julialang.org/u/erlebach)
#### Post date: [January 20, 2023, 5:21pm UTC](https://discourse.julialang.org/t/use-of-caveat-in-common-solve/93243/3 "2023-01-20T17:21:42Z")
You are correct. I misinterpreted the meaning of a:n:c. Thanksl!