global variable not working.

Question

Sameer 2014-5-19

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/130114-global-variable-not-working

评论： Geoff Hayes 2014-5-19

function [f] = objfun(n)

global f;

f = var(n);

end

How is the global variable not working

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Geoff Hayes 2014-5-19

Hi Sameer,

Please clarify the statement how is the global variable not working. What do you mean exactly?

Note that you are returning a parameter named f and you have declared a global variable with the same name. Why? There is no need to declare your return parameter as global.

Geoff

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Image Analyst 2014-5-19

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/130114-global-variable-not-working#answer_137349

You don't need to make f global if you're returning it to the caller. Why? Why do that? Declaring it global inside objfun means that f now takes on whatever value it had last instead of being a local variable. But then you just overwrite that value , so there was absolutely no point in making it global since you didn't even use its global value. Delete that global line of code.