Using cell array of function handles as nonlinear constraints in fmincon

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Lennart Vogt 2018-11-14

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https://ww2.mathworks.cn/matlabcentral/answers/429769-using-cell-array-of-function-handles-as-nonlinear-constraints-in-fmincon

评论： Torsten 2018-11-14

I have a cell array of function handles called Eqn, the unknown variable is called T. I want to use these function handles as my nonlinear equality constraints using fmincon.

I am calling my nonlinear constraint function like this:

nonlcon = @(T)EnergyBalance(T,Eqn);

The function is defined as:

function [c,ceq] = EnergyBalance(T,Eqn)
c = [];
ceq = Eqn;
end

When running I am getting the error "FMINCON requires all values returned by functions to be of data type double." which makes sense as ceq is a cell array. However I cannot convert ceq into a double as it contains multiple function handles.

So my question is: Is there a way to use a group of function handles stored in a cell array as the nonlinear constraints for fmincon?

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Lennart Vogt 2018-11-14

Ok then T is not handed correctly atm. T is supposed to be the unknown vector I am searching for

Torsten 2018-11-14

T is unknown, but a vector of doubles during the solution process, and your function handles have to be evaluated with this vector of doubles. T is not a vector of symbolic variables. I think you mix up symbolic with numerical computations.

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