find all anonymous function in a workspace

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Leo Simon 2021-12-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1612940-find-all-anonymous-function-in-a-workspace

评论： Leo Simon ，2021-12-17

采纳的回答： Walter Roberson ，

There surely has to be a way of doing this: finding all anonymous functions in a specified workspace.

Presumably the solution involves using `whos` but I can't find it on web.

For a specific example suppose my workspace has the following variables

f = @x) x^2 ;

g = @(z,y) x^3 + z;

a = rand(5,3);

b = a^3 + 5;

I want a command that will identify (and return) f and g. A bonus would be for the command to list the arguments of f and g, but I can live without that.

Thanks for any suggestions.

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Leo Simon 2021-12-17

In poorly written code, I have many anonymous functions; in some, the only arguments are endogenous variables; in others the arguments include parameters in addition. E.g.,

f = @(x,y) a*x + b*y
g = @(x,y,a,b) a*x +b*y

I obviously don't want two functions that are intended to do the same thing, so I'm going to rewrite f as below, but first I need to find all the duplicates. Applying func2str to the elements of @Benjamin 's and @Walter Roberson answer should do the trick!

f = @(x,y) g(x,y,a,b)

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采纳的回答

Walter Roberson 2021-12-17

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https://ww2.mathworks.cn/matlabcentral/answers/1612940-find-all-anonymous-function-in-a-workspace#answer_857115

Borrowing heavily from @Benjamin

f = @(x) x^2 ;
g = @(z,y) y^3  + z;
h = @sin; % This is NOT an anonymous function!!!!
a = rand(5,3);
b  = a.^3 + 5;
S = whos();
names = {S.name};
classes = {S.class};
function_handle_names = names(strcmp(classes,'function_handle'))
info = cellfun(@(S) functions(evalin('caller', S)), function_handle_names, 'uniform', 0);
issimple = strcmp(cellfun(@(S)S.type, info, 'uniform', 0), 'simple');
anonymous_functions = function_handle_names(~issimple)

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Leo Simon 2021-12-17

Ugh, sorry, it was in my startup script, shouidl have checked that. It's instructive though. I guess the pure way to be sure would be to run the info command before and after running the program, then do a setdiff to find the added anon functions.

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