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How to NOT share variable with nested function?

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Thomas Fournier
Thomas Fournier on 11 Aug 2021
Edited: Stephen on 12 Aug 2021
Hello,
I made a big code in a separate m.file, this code includes functions. I then want to make a function out of this big code, but, by doig so, i create nested functions and, as those function share the sames variable names, nothing is working properly anymore.
Is there a way to precise that the nested function inside a function should not share variables with the main function and with each other?
Thank you for your help!
  2 Comments

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Accepted Answer

Walter Roberson
Walter Roberson on 12 Aug 2021
You took a script that was of the form
some code
function first
%something
end
function second
something
end
and you converted it to a function by putting a function line at the beginning and an end at the end of it, like
function do_stuff
some code
function first
%something
end
function second
something
end
end
What you should have done instead is
function do_stuff
some code
end %end HERE, not at bottom
function first
%something
end
function second
something
end

More Answers (2)

darova
darova on 11 Aug 2021
Edited: darova on 11 Aug 2021
If you declare function or variable inside nested function it rewrites itself. There is no option for mistake
function main
a = 2;
b = 3;
a + b
function nest1
a = 5;
a + b
end
a + b
end
  4 Comments
Stephen
Stephen on 12 Aug 2021
"But why a value in main is changed?"
Shared variables are explained in the MATLAB documentation:

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Jeff Miller
Jeff Miller on 11 Aug 2021
It sounds like your "big code" is a script rather than a function, but now you want to make a function out of it.
I suggest you remove the functions from the "big code" script and put them in separate files. Then make "big code" into a function, but these other functions will no longer be nested so each will have its own separate variables.

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