Matlab: Create function with another function as argument

Question

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.

Luis Mendo · Accepted Answer · 2014-05-16 13:49:12Z

2

You can do it this way:

Define f in an m-file:

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

Define g in an m-file:

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

Call f with a handle to g:
```
>> f(1,2,3,@g)
ans =
     7
```

answered May 16, 2014 at 13:49

Luis Mendo

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Comments

gsamaras · Accepted Answer · 2014-05-16 13:46:13Z

1

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

edited May 16, 2014 at 13:46

answered May 16, 2014 at 13:30

gsamaras

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4 Comments

Gonzague Over a year ago

Ok, but then with your solution if I want to change the argument of add, I need to rewrite add.

gsamaras Over a year ago

@Gonzague, I included an example with eval and a function handler. Hope it helps.

Gonzague Over a year ago

Yes, for example if I want to use add_four and add_five instead of add_two and add_three, then I need to change acordingly in the body of add.

gsamaras Over a year ago

@Gonzague sorry for not getting that by the first moment, edited!

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