What does "@" do ?
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So this is a simple question. I found some code that uses "@" and I looked it up in the matlab documentation, but I did not find it to be really helpfull. Can somebody explain to me what it does and when/how I want to use it ?
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Vandana Rajan
2017-1-16
编辑：Walter Roberson
2023-10-6
Hi,
You might have seen function handles.
A function handle is a MATLAB® data type that stores an association to a function.
To create a handle for a function, precede the function name with an @ sign. For example, if you have a function called myfunction, create a handle named f as follows:
>> f = @myfunction;
Now if you have a function like
function y = computeSquare(x)
y = x.^2;
end
>> f = @ComputerSquare;
>> a = 4;
>> b = f(a)
will give
b = 16
Please go through these 2 documentation links which very clearly explains about function handles.
Yet another use of the symbol '@' is as class folder designator. An @ sign can indicate the name of a class folder, such as
\@myclass\get.m
See the below link for more info.
10 个评论
H ZETT M
2017-1-16
Vandana Rajan
2017-2-4
编辑：Walter Roberson
2023-10-6
Not exactly. There are some advantages too.
1. While creating a function, you write it in a .m file and save it in the MATLAB path somewhere. But Anonymous functions can be created from the command line without a script.
2. A function handle can point to a function that is not in scope at the time of execution. For example, the function can be a subfunction in another M-file.
Please use these links for more insight into the advantages of using function handles and anonymous functions
wejden hammami
2020-5-27
did you know the equivalent of @ in python ?
Stephen23
2020-5-27
"did you know the equivalent of @ in python ?"
They are not needed in Python: unlike MATLAB every function must be called using parentheses (even if they contain no inputs), and so the function name (without parentheses) can simply be passed around as a variable (e.g. as input argument, assigned to another variable, etc.). You don't need to add anything else, just use the function name.
Eun-Mo Son
2020-10-13
Good. Cheers
tuan nguyen minh
2021-10-16
thanks so much. where can i find more example like this?
tuan nguyen minh
2021-10-16
i need more example or can you explain it to me?
FuFu=@(t, u1, u2)([u2, 4*t-2*u1-(4/5)*u2]);
function f=RK_ex1(t, u1, u2)
f = [u2,4*t-2.0*u1-(4/5)*u2];
end
Walter Roberson
2021-10-16
编辑：Walter Roberson
2022-8-23
Rockford
2022-8-23
It should be computeSquare, not ComputerSquare.
更多回答（1 个）
its function handle
func = @(x) x*2+10
func(5)
3 个评论
Walter Roberson
2023-10-6
Amir Azadeh Ranjbar
2023-10-7
Well, this answer that was given (6 years ago) is more confusing....
Dyuman Joshi
2023-10-7
What makes you think it is confusing? (let alone more confusing)
And your answer does not mention important details that the accepted answer provides.
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