# Use of caveat in common solve

I get the error message:

┌ 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.

 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,

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]?

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You are correct. I misinterpreted the meaning of a:n:c. Thanksl!

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