Pointer to MATLAB function?

So I have a for-loop in MATLAB, where either a vector x will be put through one function, say, cos(x).^2, or a different choice, say, sin(x).^2 + 9.*x. The user will select which of those functions he wants to use before the for-loop.

My question is, I dont want the loop to check what the user selected on every iteration. Is there a way to use a pointer to a function, (user defined, or otherwise), that every iteration will use automatically?

This is inside a script by the way, not a function.

Thanks

Answer 1

[Oleg Komarov]

An interactive way to create an anonymous function:

% List of functions
funs     = {'cos(x).^2','sin(x).^2 + 9.*x'};

% Ask for the function through a dialog
[idx,ok] = listdlg('ListString'   ,funs,...
                   'PromptString' ,'Select one function',...
                   'SelectionMode','single');

% Convert to anonymous function
if ok
   f = str2func(sprintf('@(x)%s', funs{idx}));
end

[Kalamaya]

Wow...

Answer 2

[José-Luis]

I am not entirely sure this is what you mean but here goes:

if (first_selection)
    fun1 = @(x) cos(x).^2;
end
if (second_selection)
    fun1 = @(x) sin(x).^2 + 9 .* x;
end

And now your loop:

    for k = 1:num_Loops
        x = your_values;
        your_result = fun1(x);
    end

Cheers!

Answer 3

[owr]

Do a search in the docs on function handles. They should do the trick.

[owr]

Loren just wrote a nice blog post that might be helpful as well:

http://blogs.mathworks.com/loren/2012/08/29/thoughts-about-anonymous-functions/

Answer 4

[Ghada]

Hi all;

please i need an example of the application of iteration in ananymous function,

Awaiting to you response,

Best regards,

my mail is :[e-mail]