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public variable in gui

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mohamed al-asklany
mohamed al-asklany 2012-4-17
hello,
how can i define variable all the function of gui see it?
[Merged information from duplicate question]
if i have tow func in gui and i have variable x i need x identified from function 1 and function 2
func 1
x=1+y;
func2
z=x+1

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回答（2 个）

Image Analyst
Image Analyst 2012-4-17
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Walter Roberson
Walter Roberson 2012-4-18
The FAQ gives examples for some of the solutions, and you can search the MATLAB documentation for information on the functions mentioned.
You can also ask specific questions about interpretation of the documentation.
Image Analyst
Image Analyst 2012-4-18
What's so hard about adding your variable on to handles as a new member?

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Walter Roberson
Walter Roberson 2012-4-18
func 1
global x
x=1+y;
func 2
global x
z=x+1
This is not a recommended solution. The solutions in the FAQ that IA pointed you to are better ones.
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Sean de Wolski
Sean de Wolski 2012-4-18
global could be changed from somewhere completely different having nothing to do with the figure.
Walter Roberson
Walter Roberson 2012-4-18
The theory goes that barriers to using a variable as if it is global will introduce reluctance to indeed use it as if it is global.
Using handles introduces notable barriers, such as needing to guidata() in the assigning routine to allow the change to be seen, and needing to guidata() in any calling routine that needs to know the updated value. And for cross-gui work, needing to know the figure number of the other gui in order to be able to access its information. It is common for people to run into difficulties when they do _not_ know these mechanisms, so in one sense the barriers are being effective.
On the other hand, I have the distinct impression that what newcomers tend to learn about handles is that there is a particular _pattern_ to use, and they just go ahead and use that pattern without understanding it. Sort of like people just going ahead and entering their password any time MS Windows or OS-X ask for it. Barriers that become treated by rote become ineffective barriers.

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