CODEWITHSUNDEEP
matlab
Gonzague
Gonzague

Reputation: 39

Matlab: Create function with another function as argument

I need to create a function f with another function, g, as argument (g is defined in a .m file, not inline). In the body of f, I need to use feval to evaluate g on multiple values; something like:

function y = f(a,b,c,g)
 z=feval(g,a,b,c);
 y=...
end

What is the syntax ? I tried to use handles, but I got error messages.

Upvotes: 1

Views: 103

Answers (2)

Luis Mendo
Luis Mendo

Reputation: 112759

You can do it this way:

  1. Define f in an m-file:

    function y = f(a,b,c,g)
    y = feval(g,a,b,c);
end

  2. Define g in an m-file:

    function r = g(a,b,c)
    r = a+b*c;
end

  3. Call f with a handle to g:

    >> f(1,2,3,@g)
ans =
     7

Upvotes: 2

gsamaras
gsamaras

Reputation: 73444

If you do not want to change the body of add, then you could do that:

function s = add_two(a)
  s = a + 2;
end

function s = add_three(a)
  s = a + 3;
end

function s = add(a, fhandle1, fhandle2)
  s = feval(fhandle1, a);
  s = s + feval(fhandle2, s);
end

a = 10;
fhandle1 = @add_two;            // function handler
fhandle2 = @add_three;
a = add(a, fhandle1, fhandle2);
a

Upvotes: 1

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