[Scilab-users] ode, speed issue or tips to speed up ?

[Stéphane Mottelet]

Le 02/09/2021 à 18:03, CHEZE David 227480 a écrit :
>
> Dear all,
>
> In experimental work, I’m comparing dynamic model of a thermal system 
> with measurements. I’m using function ode, “fix” solver (continuous 
> time, lowest accuracy requirement is applying in my case at this 
> stage) and Jacobian ( to try to speed up the calculation but not 
> sensitive as for now) to get the solution of the equation,  a single 
> temperature node, at 240 times (time vector), default rtol=1.d-3 and 
> atol=1.d-4. The system inputs are available as vector of reals , size 
> is 240 and inputs are passed to the ode function as inputs functions 
> by interpolating (interp1) the inputs vectors. It is issuing correct 
> temperature solutions but is very slow, ~40s for 240 times, while the 
> variable inputs vector are actually not varying a lot and thus I would 
> expect very short calculation time.
>
> WIN10-64bits Intel i7 2,6GHz, Scilab 6.1.1
>
> Is there any tips to speed up the calculation , advanced example 
> documentation about ODEOPTIONS or ode_optional_output ? I guess it’s 
> the same underlying code that is used in Xcos isn’t it ?
>
No. Xcos uses the (more up-to-date) SUNDIALS solvers, they will be made 
available at the user level in the next months.
>
> Thank you for advising,
>
> David
>
>
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-- 
Stéphane Mottelet
Ingénieur de recherche
EA 4297 Transformations Intégrées de la Matière Renouvelable
Département Génie des Procédés Industriels
Sorbonne Universités - Université de Technologie de Compiègne
CS 60319, 60203 Compiègne cedex
Tel : +33(0)344234688
http://www.utc.fr/~mottelet

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