Location of the "end" statement of the main function in a m. file?

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Marek Gradzki
Marek Gradzki 2020-8-7
评论： Marek Gradzki 2020-8-7
Hello,
could someone write what is the difference between possible location of the "end" statement of the main function: before first local function vs end of a file? What is the difference?
For example: first vs. second case in this answer.
Thank you!
Marek

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Stephen23
Stephen23 2020-8-7
编辑：Stephen23 2020-8-7
"before first local function"
any functions defined after the main function are local functions:
https://www.mathworks.com/help/matlab/matlab_prog/local-functions.html
"vs end of a file?"
any functions defined within the main function are nested functions:
https://www.mathworks.com/help/matlab/matlab_prog/nested-functions.html
These can be combined too, e.g.:
function mymain()
... code
function mynest()
... code
end % mynest()
end % mymain()
function mylocal()
... code
end % mylocal()
Nested functions have access to the parent function's workspace. Local functions do not.
Read more here: https://www.mathworks.com/help/matlab/matlab_prog/types-of-functions.html
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Marek Gradzki
Marek Gradzki 2020-8-7
Ok, right, thanks! So I guess the main difference is about access to the variables defined in the main function.

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更多回答（1 个）

Sudheer Bhimireddy
If you have 'end' at the end of a file, then your functions become 'Nested functions'. The variables created inside the function and their scope changes.
Read this, this and this MATLAB documentation.
Hope this helps.
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Bruno Luong
Bruno Luong 2020-8-7
编辑：Bruno Luong 2020-8-7
function caller
a = 1;
function c = foo(d)
eval('b = d;'); % error "forbidden"
c = a + b;
end
function c = bar(d)
b = [];
eval('b = d;'); % OK
c = a + b;
end
fprintf('bar(2) = %g\n', bar(2));
fprintf('foo(2) = %g\n', foo(2)); % this won't run
end

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