# How do I designate some variables in the same time that are starting with specific characters?

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HyoJae Lee le 3 Mar 2023
Modifié(e) : Stephen23 le 13 Mar 2023
Hello,
It's a quite simple question.
For example, I have variables named n1, n2, and n3. They have similar names starting with n.
And, those are all cell structure.
I want to exchange this variables into double using cell2mat function.
I want to designate those in the same time and change into double.
I tried
n*=cell2mat(n*)
but, It didn't work.
How can I change this?
Sorry for my bad English. If you have any question regarding this, feel free to ask.
Thanks,
Hyojae.
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Stephen23 le 13 Mar 2023
Modifié(e) : Stephen23 le 13 Mar 2023
"For example, I have variables named n1, n2, and n3. They have similar names starting with n."
Numbering variable names like that is usually a bad data design...
because accessing numbered variable names (like you have) is slow, complex, and inefficient:
You should use indexing. Indexing is simple (just as Matthieu showed below) and very efficient.

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### Réponse acceptée

Matthieu le 3 Mar 2023
Hi,
n = cell(1,3) ; % Replacing your n1, n2, n3 notation with n{1}, n{2}, n{3}
for i = 1:3
n{i} = {1,2,3} ; % Define n{i} cells as you want
end
for j = 1:3
n{j} = cell2mat(n{j}) ; % Converting cells to double
end
n
n = 1×3 cell array
{[1 2 3]} {[1 2 3]} {[1 2 3]}
Is this what you wanted ?
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HyoJae Lee le 6 Mar 2023
Appreciate, Matthieu!!
Peter Perkins le 13 Mar 2023
If n1, n2, and n3 end up being column vectors all with the same length, you might find it useful to put them into a table rather than a cell array. For example, something like
n1 = {1;2;3}; n2 = {4;5;6}; n3 = {7;8;9};
t = table(n1,n2,n3)
t = 3×3 table
n1 n2 n3 _____ _____ _____ {[1]} {[4]} {[7]} {[2]} {[5]} {[8]} {[3]} {[6]} {[9]}
t.n1
ans = 3×1 cell array
{[1]} {[2]} {[3]}
t = varfun(@cell2mat,t)
t = 3×3 table
cell2mat_n1 cell2mat_n2 cell2mat_n3 ___________ ___________ ___________ 1 4 7 2 5 8 3 6 9
t.cell2mat_n1
ans = 3×1
1 2 3

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