Error in using 'frestimate' for MIMO system
2 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
I am using frestimate for finding frequency response function of a non-linear system which has multiple inputs and multiple outputs,

Picture above shows the simulink model, I have selected 1 input (out of 2) and 1 output (output), I get following error after using
[sysest,simout] = frestimate(mdl,getlinio(mdl),in);
Error using frestimate>LocalRunSimulation (line 1165)
State derivatives returned by S-function 'System_Model' in 'Non_Linear_Model_FRF/Validation
Setup/S-Function' during flag=1 call must be a real vector of length 13
Error in frestimate (line 255)
[simout{ctexp},err] = LocalRunSimulation(parammgr,SimulationPackage,ctexp); -
Show complete stack trace
0 commentaires
Réponses (1)
Walter Roberson
le 26 Juin 2020
Your S function Validation Setup has 13 outputs. The model derivatives for it must return 13 values, one for each of those 13 outputs.
It looks to me as if your S function is probably a Level 1 S function that is being passed u and flag and is expected to detect the various flag states to decide what it is doing.
4 commentaires
Walter Roberson
le 26 Juin 2020
After the assignment to sys, add in lines:
assert(length(sys) == 13, 'derivatives are wrong length')
assert(all(isfinite(sys)), 'derivatives are not all finite')
assert(all(imag(sys) == 0), 'derivatives are not all real')
Voir également
Catégories
En savoir plus sur General Applications dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!