Is it possible to reference an array of inline functions or function handles created within a structure in MATLAB?

Question

MathWorks Support Team 2009-6-27

The following example demonstrates this problem:

f1 = inline('sin(x)');
f2 = inline('cos(x)');
h.f(1) = f1;

I now calculate

h.f(pi/2)
 ans =
       1

But if I define:

h.f(2) = f2

I get

 h =
      f: [1x2 inline]

Now I try to calculate inline results:

h.f([pi/2;pi/2])

I receive the error

??? Comma separated list must have exactly one item.

How can I reference the index of the vector of the inline functions, as well as pass an argument?

Answer 1

You should not create the vector of inline functions. When you do this without a structure, you receive an error.

f1 = inline('sin(x)');
f2 = inline('cos(x)');
f(1) = f1;
f(2) = f2

??? Comma separated list must have exactly one item.

To work around this error, rather than creating a vector of inline functions, you should create a cell array. Here is an example:

     f1 = inline('sin(x)');
     f2 = inline('cos(x)');
     h.f{1} = f1;
     h.f{2} = f2;
     h.f{2}(pi/4),

This produces the correct result:

    ans =
    0.7071

You can also do this with function handles

f{1}=@sin;
f{2}=@cos;
feval(f{1},1);
end