Negation of a function handle

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Daniela Würmseer
Daniela Würmseer 2022-2-19
回答： John D'Errico 2022-2-19
Hello,
i have an Optimizationproblem where i want to negate my functions (which are nonlinear) if it is a max Problem.
minusf2 = @(x) -f2;
This is working but at one point of my programm i want to do the following:
c1 =@(x) f2(x) - d(2)*x(size(A,2)+1) - z(2);
and then i get this message:
Unary operator '-' is not supported for operand of type 'function_handle'
(My code is perfectly working for min Problems, but i wanted to try to apply it even for max Problems by negating functions but then my calculations are not working. Does someone knows a trick here? Thanks

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John D'Errico
John D'Errico 2022-2-19
minusf2 = @(x) -f2;
"This is working"
No. In fact, that does NOT work. That will simply not work. If f2 is a function handle, and you want to negate it, then you do this:
minusf2 = @(x) -f2(x);
So you evaluate f2, and then negate the result of f2.

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