ERROR: FMINCON requires all values returned by functions to be of data type double.

Question

Siwei Luo 2023-11-16

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2048062-error-fmincon-requires-all-values-returned-by-functions-to-be-of-data-type-double

回答： Walter Roberson 2023-11-16

This is the main running code, once started will always report this error.

Func is my object function.

Func =  @(x) WW_Period_Sum(x);
options = optimoptions('fmincon','Display','iter');
nonlcon = [];%@myConstraintFunction;
a = fmincon(Func, x0, [], [], [], [], [], [], nonlcon, options);%x0 is already assigned.
Unrecognized function or variable 'x0'.

I have this nonlcon function. ce and ceq are all array of cells about x

function [ce, ceq] = myConstraintFunction(x)
    ce = @(x) ineq_temp;
    
    ceq = @(x) eq_temp; 
end

H is a matrix, and I'm trying to find its Condition Number.

function cond_value = calcCond(x,t);
    cond_value = @(x,t) cond(H);
end

Sum of all values within 0.01s.

function WW_period = WW_Period_Sum (x);
    WW_period_=@(x) 0;
    for t=0:0.002:0.01
        cond_temp = @(x) calcCond(x, t);
        WW_period_ = @(x) WW_period_(x) + cond_temp(x);
    end
    WW_period = WW_period_;
end