Use string to index variables

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Matteo Bonhomme
Matteo Bonhomme 2022-10-4
评论： Matteo Bonhomme 2022-10-4
Hello,
So far I have data that depend on several parameter, something like that
%data first index is the year 1 for 2021 2 for 2022
%data second index is the person 1 for Ana 2 for Bob
%data third index is 1 the size 2 the age
data[1,2,2]=43; %the age of BOB in 2021
I want something like this
data['2021','Bob','age']=43;
And ideally if I want to add someone else I could just do
data['2021','Camille','age']=55; %adding a new person
Is there any syntaxe in matlab that allows me to do that ?
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Stephen23
Stephen23 2022-10-4
编辑：Stephen23 2022-10-4
Ran in:
Note that in MATLAB square brackets are a concatenation operator, so your code
['Bob','Alice']
is exactly equivalent to
'BobAlice'
"This doesn't work for me because I'd like to do stuff like this"
It works for me:
data.y2021.Bob.age = 43;
data.y2021.Alice.age = 55;
for name = ["Bob","Alice"]
data.y2021.(name).age
end
ans = 43
ans = 55
https://www.mathworks.com/help/matlab/matlab_prog/generate-field-names-from-variables.html
If you have a recent enough version, you could possibly use a dictionary:
https://www.mathworks.com/help/matlab/dictionary.html
https://blogs.mathworks.com/matlab/2022/09/15/an-introduction-to-dictionaries-associative-arrays-in-matlab/
Note that meta-data is data, and most tasks are easier to solve in MATLAB when data is stored in variables.

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