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# How can I make struct with existing variables?

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Giorgi on 22 Aug 2014
Edited: Matt J on 22 Aug 2014
Hi all, Well i have some variables for example alfa, beta and gama, Now I want to make structure that will contain these variables. Can someone give me a code or function with which i will be able to do it.
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### Accepted Answer

Matt J on 22 Aug 2014
Edited: Matt J on 22 Aug 2014
Using structvars ( Available here ).
>> clear
>> a=1; b=2; c=3;
>> s=whos;
>> C=cell2struct({s.name}.',{s.name})
C =
a: 'a'
b: 'b'
c: 'c'
>> structvars(C,0); %copy/paste the output below to the command line
ans =
C.a = a;
C.b = b;
C.c = c;
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Matt J on 22 Aug 2014
Though I don't really recommend it, you could also do
>> eval(structvars(C,0).'); C
C =
a: 1
b: 2
c: 3

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### More Answers (3)

Matt J on 22 Aug 2014
Edited: Matt J on 22 Aug 2014
>> save tempFile *
>> S=load('tempFile');
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Adam on 22 Aug 2014
Edited: Adam on 22 Aug 2014
myStruct.alfa = alfa;
myStruct.beta = beta;
etc.
Or
myStruct = struct( 'alfa', alfa, 'beta', beta );
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Adam on 22 Aug 2014
I could try to give some help further along this line, but I think potentially either of Matt J's solutions would work better so unless neither of them do I'll leave it.

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Guillaume on 22 Aug 2014
s = struct('alpha', alpha, 'beta', beta, 'gamma', gamma);
doc struct
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Guillaume on 22 Aug 2014
You could dynamically create a structure with 30 field names that are the names of the variables, however I would urge to think whether it's really what you want. How are you going to then use that structure if the field names are created arbitrarily. I would advise against this as your code may easily break in the future because a hardcoded field is not there anymore.
If that's really what you want to do, then structvars from the other answer (you have to download it), or the following function will do it:
function s = variables2struct(varargin)
s = struct;
for var = 1:nargin
s.(genvarname(inputname(var), fieldnames(s))) = varargin{var};
end
end

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