Is it possible to create multiple functions and calling them in one .m file?

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Ekin 2013-8-27

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评论： Walter Roberson 2017-9-19

I have a question about calling a function in Gui. Here is an example of my code:

   function pushbutton1_Callback(hObject, eventdata, handles)
   ABC = handles.Murthy(result);      %%????? This line
   %button implementation
   function maxmax = Murthy (result)
   %Murthy implementation

The function Murthy also contains "axes(handles.axes1);" etc. How to call function Murthy without deleting gui control codes (like "axes(handles.axes1)" etc) from it? Thanks in advance!

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Walter Roberson 2013-8-27

编辑：Walter Roberson 2013-8-27

在 MATLAB Online 中打开

ABC = handles.Murthy(result);

is not going to work because you do not have "result" defined.

Is Murthy going to return the name of an axis ? Is it going to return an axes object that you then want placed under a figure determined by pushbutton1_Callback ??

Ekin 2013-8-28

Thanks now solved, defined "result" above once more :)

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Answer 1

Iain 2013-8-28

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编辑：Iain 2013-8-28

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Generically, this is the process:

 function whee = whatevs(a,b,c) %1st line of m file
 whee = alpha(a) + beta(b) + gamma(c);
 end
 function a = alpha(x) %still in the whatevs.m
  a = x.^2;
 end
 function b = beta(x) %still in the whatevs.m
  b = 2.^x;
 end
 function c = gamma(x) %still in the whatevs.m
  c = x^x;
 end

You can also "nest" functions: eg, gamma could be:

 function c = gamma(x) %still in the whatevs.m
  c = banana^x;
  function b = banana
   b = randn*5;
  end
 end

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Sara 2017-9-19

Lain, how do you call function b or c in a separate script this way?

I know it is possible to make separate .m files for each function and call them that way. I currently have a script that calls three functions, which are all each their own .m file. I am trying to simplify my code some, so if you can do it the way you described, this would help.

Walter Roberson 2017-9-19

在 MATLAB Online 中打开

To be able to call a function from outside of the file it is stored in:

1) the function can be in its own file named the same as the function (like you have now); or

2) somehow the calling function has to have been given a handle to the function to be called. For example,

function fh = switchyard(which_function)
   switch lower(which_function)
      case 'add': fh = @add_all_the_things;
      case 'ghoti': fh = @go_fish;
      otherwise:
        error('not a known function for switchyard');
   end
end
function [a, b, c] = add_all_the_things(....)
  ...
end
function d = go_fish(....)
   ...
end

Then another function could say,

   fish = switchyard('ghoti');
   r = fish( randi(13) );

The switchyard function would return a handle to the go_fish function stored in switchyard.m and then once the calling function has that handle, it can invoke it.

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