scope of a variable

Question

biswajita lenka 2012-1-2

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https://ww2.mathworks.cn/matlabcentral/answers/25102-scope-of-a-variable

hi, i am modifying a global variable inside a function.inside the function it works and stores the modified value.but when i am trying to access the same variable outside the function after it is modified,it is showing me the old value instead of the modified new value. can anybody help me?

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Answer 1

Walter Roberson 2012-1-2

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https://ww2.mathworks.cn/matlabcentral/answers/25102-scope-of-a-variable#answer_32965

Have you declared the variable as being global inside the function? Global variables are only global in routines that use the 'global' declaration (or in nested routines that share variables with a routine that declares them as global.)

Also, note that if you have declared a variable as a parameter to a function, and then in the function you declare it to be global, then it will not be treated as global: using a variable as a parameter overrides a global declaration.