How to Access a Variable's Value in a Nested Function?

Question

Rightia Rollmann 2017-2-28

0
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https://ww2.mathworks.cn/matlabcentral/answers/327359-how-to-access-a-variable-s-value-in-a-nested-function

评论： Adam 2017-2-28

How Can I see the value of variable g in Command window and Workspace?

function parentfcn(b)
a = b+1
    function childfcn
        g = a+1 
    end
end

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Adam 2017-2-28

The shared workspace of a nested function and the main function is not bi-directional. The nested function has access to everything in the workspace of the main function, but not the other way around.

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Answer 1

Walter Roberson 2017-2-28

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https://ww2.mathworks.cn/matlabcentral/answers/327359-how-to-access-a-variable-s-value-in-a-nested-function#answer_256695

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The nested workspace stops existing as soon as parentfcn returns.

See however,

function r = parentfcn(b)
a = b+1
childfcn();
r = @childfcn;
    function childfcn
        g = a+1 
    end
end

together with

bbb = parentfcn(7)
s = functions(bbb)
s.workspace{1}

Notice that even though you called childfcn, that the workspace of childfcn does not include the local variable g: the workspace retrieved only includes the objects that the child shares with the parent. g stops existing as soon as childfcn returns.