how to prealloacte and store values in a character array?

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Hi! :)
I want to make a character array consisting of 3 rows and 2 strings and firstly I dont know how I can preallocate it. I also tried to store values in it ( in the first row) using the attached code but failed to do so
best_salt_1 = "ZnBr2";
best_salt_2 = "Format";
combinations_of_best_salts=char(zeros(antall_soner,2))
combinations_of_best_salts(1,1:strlength(best_salt_1))=best_salt_1;
combinations_of_best_salts(1,strlength(best_salt_1):18- strlength(best_salt_2))=best_salt_2;
disp(combinations_of_best_salts)
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Muazma Ali
Muazma Ali on 2 Aug 2022
Edited: Muazma Ali on 12 Aug 2022
@Stephen23 Row one of combinations_best_salts should be : ZnBr2 Format

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Answers (1)

Stephen23
Stephen23 on 12 Aug 2022
Edited: Stephen23 on 12 Aug 2022
I am guessing that your strings have different lengths on different loop iterations, in which case it mght not be obvious how to preallocate the array.
Here are two alternative approaches:
N = 7; % number of rows
Character array (preallocated rows, expand columns as required):
M = char(nan(N,0));
for k = 1:N
[S1,S2] = rndstr(k); % random strings
V = sprintf('%s %s',S1,S2);
M(k,1:numel(V)) = V;
end
display(M)
M = 7×12 char array
'd!=.) AFS ' '#TIH@ [=:[ ' 'c<Qtu 4%J ' 'T|db5|! Ij3r' 'r4wN hQ<2(f ' '@n$+XRH [JfQ' 'jJe SP':O`l '
Cell array to collect data, CHAR() after the loop:
C = cell(1,N);
for k = 1:N
[S1,S2] = rndstr(k); % random strings
C{k} = sprintf('%s %s',S1,S2);
end
M = char(C{:})
M = 7×12 char array
'd!=.) AFS ' '#TIH@ [=:[ ' 'c<Qtu 4%J ' 'T|db5|! Ij3r' 'r4wN hQ<2(f ' '@n$+XRH [JfQ' 'jJe SP':O`l '
function [st1,st2] = rndstr(k)
rng(k);
st1 = string(char(randi([33,126],1,randi([3,7]))));
st2 = string(char(randi([33,126],1,randi([3,7]))));
end
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