Error: Operator '-' is not supported for operands of type 'function_handle'.

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Daniela Würmseer 2022-2-10

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https://ww2.mathworks.cn/matlabcentral/answers/1647180-error-operator-is-not-supported-for-operands-of-type-function_handle

评论： Star Strider 2022-2-10

采纳的回答： Star Strider

Hello, i have the following Code:

f1 = [-1,-1];

f2=@(x)-10*x(1)+x(1)^2-4*x(2)+x(2)^2;

A = [3 1;

2 1 ;

1 2];

b = [12; 9; 12];

z = [0,0];

d = [-1,0];

Method(f1,f2,A,b,z,d);

function [x,alpha] = Method(f1,f2,A,b,z,d)

f =@(x)-x(size(A,2)+1);

x0 = (zeros(1,size(A,2) + 1));

lb = [(zeros(1,size(A,2))),-Inf];

if (~isempty(f1))

Anew = [f1,-d(1)];

Anew(2:size(A,1)+1,1:size(A,2)) = A;

bnew = [z(1);b];

c1 =@(x) f2 - d(2)*x(size(A,2)+1) - z(2);

(else ... %in this case Anew,bnew and c1 would look different)

end

nonlincon = @constr;

function [c,ceq] = constr(x)

c = c1;

ceq = [];

end

[x,alpha]=fmincon(f,x0,Anew,bnew,[],[],lb,[],nonlincon);

end

This gives me the following error: Operator '-' is not supported for operands of type 'function_handle'.

I know that it is because of the line "c1 =@(x) f2 - d(2)*x(size(A,2)+1) - z(2);". Does someone knows how i could solve this problem? Thanks.

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David Hill 2022-2-10

A general description of what you are trying to do with inputs and expected outputs would be helpful. I cannot follow your code (lots of problems).

Daniela Würmseer 2022-2-10

It is a part of a specific Algorithm. I want to use the fmincon function to solve a nonlinear Problem. At the beginning f1, f2, A,b,z and d are given. But inside the function "Method" we want to change this problem still a bit before giving it into fmincon.

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