Global variables in matlab

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kajalschopra
kajalschopra 2015-7-27
回答： Image Analyst 2015-7-28
I have a file_1.m file which has the following code;
global a;
a=1;
b=2;
file_2();
And my file_2.m has the following
function file_2
c=a+3;
d=2;
end
I had thought that since I have declared "a" as global in file_1.m, file_2 should have access to its value without passing a as an argument.
But it does not. How is it possible for file_2 to have access to the value of 'a' without passing it as an argument?

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采纳的回答

Walter Roberson
Walter Roberson 2015-7-27
You need to specifically say that the variable is in the global namespace in the second file.
global a

更多回答（1 个）

Image Analyst
Image Analyst 2015-7-28
See the discussion of globals here in the FAQ. Basically it's more like friend than global , in that only functions that also declare the variable will be able to see it , and functions that don't declare the variable as global will not be able to see it.

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