Piece-wise handle function help

Hello Dear Experts,

Consider I have a piece wise function and I want to create it using handle @ and pass it to another function, please guide me how to do this.

For example, how to define: f = @(x) x^2 if x<0, -x^2 if x>0

and to pass it to another function: func(f) After passing the function to the func, I need to be able to operate with it

for example:

function res = func(f)

res = f(5);

end

Answer 1

[per isakson]

Try

    >> cssm
    ans =
       -25

where in one m-file, cssm.m

    function y = cssm
        y = foo( @piece_wise );
    end

    function r = piece_wise( x )
        if x < 0
            r = x*x;
        else
            r = -x*x;
        end 
    end  
    function r = foo( f )
        r = f(5);
    end

The three function may be defined in separate m-files

Answer 2

[Matt Fig]

It is not terribly efficient, but can be done:

f = @(x) (x.^2).*(x<0)-(x.^2).*(x>=0);
x = -10:.001:10;
plot(x,f(x))

[Andrei Bobrov]

f1 = @(x)-sign(x).*x.^2