How to make 'blue' variable?

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Mikhail 2014-9-12

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https://ww2.mathworks.cn/matlabcentral/answers/154449-how-to-make-blue-variable

评论： Mikhail 2014-9-15

Hi all, I'm trying to make my own ImageViewer. Using some program as a template, I saw a lot of 'blue' variables in it (when I point on such variable there is a text "The scope of variable ... spans multiple function").

Now I understood, that I want to use such variables also - in callback functions to update text, data, and so on.

How can I create such variables? Short explanation of what does it mean is appreciated as well. Thanks.

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Answer 1

Image Analyst 2014-9-12

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https://ww2.mathworks.cn/matlabcentral/answers/154449-how-to-make-blue-variable#answer_151431

在 MATLAB Online 中打开

Keywords are in pure blue. Global variables are in cyan. You can just put the line

global myVariable;

in any function that needs to see the global variable. Other than that, just create it and use it like any other variable.

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Mikhail 2014-9-15

But in that template there is only one variable defined as global. However there arre a lot of global variables. When I am trying to do that in my program, my callback function doesn't use it as global

Image Analyst 2014-9-15

Post a screenshot of your screen so we can see it. In nwindows type alt-PrintScreen, then go to http://snag.gy and paste it in and give us the url or click on the green and brown image icon to paste it in your response here.

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Answer 2

Mikhail 2014-9-15

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https://ww2.mathworks.cn/matlabcentral/answers/154449-how-to-make-blue-variable#answer_151772

Look! only 1 global variable is defined, however you can see a lot of cyan variables.

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Mikhail 2014-9-15

Got it, in that template he just wrote callback function inside main function. Therefore variables which he used in both main and callback function automatically became cyan. Thanks

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