Why do I get error when using a simple global variable?

Question

Merve Özkanat 2022-9-27

0
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https://ww2.mathworks.cn/matlabcentral/answers/1812805-why-do-i-get-error-when-using-a-simple-global-variable

回答： Chunru 2022-9-27

I get error and it says ''Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters''

global a b t E nu

GP1=(-a/(sqrt(3),-b/(sqrt(3))

GP2=(a/(sqrt(3),-b/(sqrt(3))

GP3=(a/(sqrt(3),b/(sqrt(3))

GP4=(-a/(sqrt(3),b/(sqrt(3))

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Answer 1

Chunru 2022-9-27

1
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https://ww2.mathworks.cn/matlabcentral/answers/1812805-why-do-i-get-error-when-using-a-simple-global-variable#answer_1061455

在 MATLAB Online 中打开

Not sure what the code is trying to do. However, the error is due to the wrong usage of ( ) rather than global variables.

global a b t E nu
a=1; b=2; t=3; nu=4;
GP1=[-a/sqrt(3),-b/sqrt(3)]
GP1 = 1×2
   -0.5774   -1.1547
GP2=[a/sqrt(3),-b/sqrt(3)]
GP2 = 1×2
    0.5774   -1.1547
GP3=[a/sqrt(3),b/sqrt(3)]
GP3 = 1×2
    0.5774    1.1547
GP4=[-a/sqrt(3),b/sqrt(3)]
GP4 = 1×2
   -0.5774    1.1547