Use of "return" in simple if statement

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MiauMiau
MiauMiau 2013-1-25
评论： Walter Roberson 2017-3-7
Hi
I have of course read the explanations regarding the return statement. Still in the following case:
if (parameter < 1)
disp('Wrong parameters...');
return
end
I don't see what difference it makes if we use "return" here or we dispense with it..
Thanks
  1 个评论
Image Analyst
Image Analyst 2013-1-25
Just a suggestion - instead of disp() you might use
uiwait(warnglg('Wrong parameters...'));
I think it's a little nicer to have a popup message box. Better yet, use sprintf() to create your string and tell your users what they entered and what the valid range is.

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采纳的回答

Walter Roberson
Walter Roberson 2013-1-25
If you do not "return" then the rest of the function would be executed.
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Guillaume
Guillaume 2017-3-7
You'll be better off asking a forum dedicated to R!
Walter Roberson
Walter Roberson 2017-3-7
Looking at https://cran.r-project.org/doc/manuals/r-release/R-lang.html#Scope I see
return(g)
This tells me that R has return() and that typically you would need to tell it what to return.

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更多回答（1 个）

Evgeny Pr
Evgeny Pr 2013-1-25
编辑：Evgeny Pr 2013-1-25
You need to use ERROR function, do not return:
function myfunc(parameter)
if (parameter < 1)
error('Wrong parameters...');
end
% continue
end
...or:
function myfunc(parameter)
if (parameter < 1)
disp('Wrong parameters...');
else
% continue
end
end

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