# What does @m and m(:) signify here?

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Siddharth Behal il 27 Ott 2021
Commentato: Jaya il 27 Ott 2021
cell2mat(cellfun(@(m)m(:),a,'uni',0))
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### Risposte (2)

Star Strider il 27 Ott 2021
Correctly stated ‘@(m)’ is a function handle (see What is a Function Handle? for details) and the ‘m(:)’ forces the argument ‘m’ to be a column vector (see MATLAB Operators and Special Characters for those details), and since ‘m’ is obviously a cell array (that can contain anything, however here appears to be numeric) —
a = {randi(9, 1, 5)} % Cell Row Vector
a = 1×1 cell array
{[2 4 3 7 7]}
out = cell2mat(cellfun(@(m)m(:),a,'uni',0)) % Array Column Vector Result
out = 5×1
2 4 3 7 7
Experiment to get diferent results.
.
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Jaya il 27 Ott 2021
Ah yes, function handle! I just forgot the word and was trying to explain in my own terms.

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Jaya il 27 Ott 2021
Modificato: Jaya il 27 Ott 2021
From what I know, @(m) specifies a function that which will be defined in terms of m. And what the function does i.e. the function description is m(:). The a is the data structure (whatever type it is) on which the the function will perform its action, m(:).
Using the above description you can take a look at the example below (from mathworks website) and make an analogy . Here the task is to extract first three characters from the str elements. Hope this helps!
str = ["Saturday","Sunday"]
str = 1×2 string array
"Saturday" "Sunday"
B = cellfun(@(x) x(1:3),str,'UniformOutput',false)
B = 1×2 cell array
{'Sat'} {'Sun'}
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