How to call a created function in a different function

Hi there!

I made several functions like myfunc1.m , myfunc2.m, myfunc3.m and so on.

they all take one function and two doubles, and they output 2 arrays like this.

function [X Y] = myfunc3(f, a, b)
    % ------------------------
    % --Doing Something like--
    % --      x = a:b       --
    % --      y = 3*x       --
    % --      X =  x        --
    % --      Y = f(x,y)    -- 
    % ------------------------
end

Im trying to make a new function that takes one of my functions as its argument. Expected outputs will be like this.

>> myNewfunc(@ myfunc3)
ans =
    'It is my 3rd function!'
>> myNewfunc(@ myfunc2)
ans =
    'It is my 2nd function!'

so I wrote like this to call a function in the new function

    function myNewfunc(myfunc)
        % --------------------------------
        % --   %Hard Coded f, a, b      --
        % --      f = @(x,y) x + y      --
        % --      a =  1                --
        % --      b =  10               --
        % --  [X Y] = myfunc(f,a,b)     -- 
        % --------------------------------
        %
        %Somehow Check and disp its number
        %
    end

but it gets an error at the line of [X Y] = myfunc(f, a, b) and shows "Reference to a cleared variable myfunc."

How can I tell Matlab I am trying to call one of created functions in another function?

Thank you! and any help will be appreciated.

Answer 1

[Stephen23]

Download my FEX submission num2ord and use it together with func2str:

function out = myNewFunc(fun)
val = str2double(regexp(func2str(fun),'\d+$','once','match'));
out = sprintf('It is my %s function!',num2ord(val));
end

Tested:

>> myNewFunc(@myfunc3)
ans =
It is my 3rd function!

See also:

https://www.mathworks.com/help/matlab/function-handles.html

Tip: rather than creating numbered functions, which will be hard to access and just clutter up the workspace, you might like to consider simply creating a cell array of function handles (which can be trivially accessed using indexing):

C = {@(...)..., @(...)..., ...} % define
C{1}(...) % call the first function

[Jongan Park]

Thank you so much for the detailed answer and useful tip!