Optimization problem - solving problem within a loop

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Muzammil Ali
Muzammil Ali 2019-7-9
评论： Muzammil Ali 2019-7-29
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.

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回答（1 个）

Yogesh Khurana
Yogesh Khurana 2019-7-29
You can use Optimization Expressions for defining objective functions and its variables inside a for-loop. Refer to the following link for more information:
https://www.mathworks.com/help/optim/ug/optimization-expressions.html
Hope it helps!
  1 个评论
Muzammil Ali
Muzammil Ali 2019-7-29
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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