putting return to a function

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Salvatore Mazzarino 2012-10-13

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评论： Nguyen 2023-10-26

I have created a function "my_function" and into it I call another function called "another_function".

function my_function()
     value = another_function(foo);
end

My question is: inside another_function(), do I need to put a line of code that says "return", or I may omit the return keyword and simply return automatically by finishing executing all lines of "another_function()"?

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Answer 1

Matt Fig 2012-10-13

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编辑：Matt Fig 2012-10-13

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Salvatore, are you asking how to make the function return the value that will be assigned to 'value' inside my_function? In MATLAB, unlike some other languages, there is no need to tell the function which value to return to the caller by a special call to the return keyword. For example, put this in your local directory:

function out = mysquarefcn(in)
out = in.*in;

Once you save that as mysquarefcn.m, the from the command line call it like this:

>> mysquarefcn(3)
>> G = mysquarefcn(3)

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Answer 2

Image Analyst 2012-10-13

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You can put returns wherever necessary in the function. At the end of the function it is optional (not necessary) but you can if you want

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Image Analyst 2021-7-20

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@Brianna Biondo, for example, in the file my_function.m you would have all these lines of code:

function my_function()
    % Assign some input value that we will pass to another_function().
    foo = 37.4;
    % Pass the input value to another_function().
    value = another_function(foo);
    % Now print its value to the command window.
    fprintf('After calling "another_function(%f)", we get value = %f.\n', foo, value);
end
% Now declare another function below the main function that has the name of the script.
% This function can be below the main my_function function in the same m-file,
% OR in a different m-file called "another_function.m".
function outputValue = another_function(inputValue)
outputValue = 10 * inputValue;
return;  % This line is completely optional.
end