Define multible Global Variables
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Hello,
i used to declare global variables like this.
global p
% Körper 1
p.b1 = 1;
p.h1 = 0.6;
p.h1s = 0.3;
p.hp = 0.5;
...
This isn´t working anymore. does somebody know why?
回答（1 个）
Your declarations should (still) work. Don't forget that you must declare the global variables again in the local workspace in order to access them.
global p
p.b1 = 1;
p.h1 = 0.6;
function dontUseGlobalVariables()
global p
% Now you have access to the p structure.
end
But again, please see this link to this comment to learn why global variables are a sign of bad programming.
2 个评论
John D'Errico
2019-5-19
Good function name. :)
Rik
2019-5-19
The only additional advice I would give is this: if you absolutely need to use globals, use a long name that contains the name of your top level function and is very descriptive. Using a long avoids collisions with other functions that might be using a similarly named variable. You have 63 characters for your variable name, you should use more than just 1.
I you think the name is too long and cumbersome to work with, create a temporary copy internal to your function. If you are not modifying the global there is no downside, thanks to the copy-on-write behavior of Matlab.
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