Optimization problem - solving problem within a loop

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Muzammil Ali
Muzammil Ali am 9 Jul. 2019
Kommentiert: Muzammil Ali am 29 Jul. 2019
I have a function in which I am using a loop and also discretisation in time. It is solving a PDE using Fully implicit backward method. I want to know how to define the objective function as the values are changing within the loop with time. Also how do I specify the variables which need to be modified for optimisation.
Thank you.

Antworten (1)

Yogesh Khurana
Yogesh Khurana am 29 Jul. 2019
You can use Optimization Expressions for defining objective functions and its variables inside a for-loop. Refer to the following link for more information:
Hope it helps!
  1 Kommentar
Muzammil Ali
Muzammil Ali am 29 Jul. 2019
I have two variables to optimise and I put it in the following form:
ratio = optimvar('ratio',1,1,'LowerBound',0,'UpperBound',1);
Dsw = optimvar('Dsw',1,1,'LowerBound',0,'UpperBound',1e-9);
But I get the following error:
Undefined function 'exp' for input arguments of type 'optim.problemdef.OptimizationExpression'.
Error in drying_optimisation_function (line 409)
DwsA=Dsw(1)*(exp(ratio(1)*(1-1/(1-((1-cf./(1+cf))*rhodropA/rhosolid))))*exp(-1.39e5*(exp(-3.32*(1-cf./(1+cf))))/8.314*(1/Tp(k)-1/298)));

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