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FAQ: How can I create variables A1, A2,...,A10 in a loop?
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How can I create variables A1, A2,..., A10 in a loop?
6 Comments
Accepted Answer
Jan
on 26 Dec 2012
Edited: Jan
on 24 Apr 2017
1 Comment
Edward Byers
on 19 Jul 2016
Hi Is there a good way to store multiple iterated LinearModel objects? i.e. with an index notation that makes it easy to loop and call specific instances, I have tried:
mdl{x} = fitlm(tbl,modelspec);
But that doesn't work, as: "Assignment using () is not allowed for a FitObject."
More Answers (2)
Robert Cumming
on 10 Sep 2014
Edited: Robert Cumming
on 10 Sep 2014
I 100% agree with Jan that creating new variables on the fly is something that should be avoided - but if you must then please consider this alternative method:
function generateVariableOnFly
% lets tic/toc to compare the use of eval and assignin
tic
eval ( 'a = zeros(10,10);' )
toc
% an alternate method is to use a
% sub function which assigns vars in the caller function:
tic
variableCreator ( 'b', zeros(10,10) )
toc
% validate that a and b both exist and are the same:
isequal ( a, b )
end
% Use a sub function which assigns variable in the caller function:
function variableCreator ( newVar, variable )
assignin ( 'caller', newVar, variable );
end
To complete Jans example you could use this in the following way:
for ii=1:10
variableCreator ( sprintf ( 'A%i', ii ), ii )
end
That would create variables A1, A2.... A10.
3 Comments
Oussama HAYANE
on 1 Jan 2020
Thank you very much for this answer
for ii=1:10
variableCreator ( sprintf ( 'A%i', ii ), ii )
end
it gives axactly what I looked for
Now, my quaestion is :
What can I do if I want to use one of these variables on an other loop
i.e. : how can I call them using Index 'A%i'
I want to modify a value of one these vriables but i don't know wich one : in my code I have a condition that determine wich one of these 'A%i' will be modified; so how can I call this 'A%i' to give it a new value
example: A5 = 8;
and I want to change it to : A5 = 19;
Stephen23
on 1 Jan 2020
Edited: Stephen23
on 1 Jan 2020
@Oussama HAYANE: use indexing. Indexing is much simpler and more efficient than what you are trying to do:
A(5) = 8;
A(5) = 19;
Indexing is explained quite well in the introductory tutorials:
Is there a particular reason why you need to write such slow, complex, obfuscated code?
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