Negation of a function handle

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

Answer 1

[John D'Errico]

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.