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Create a row vector comparing strings in a for loop

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I have two string arrays with different sizes and assume that the second one (s2) has a variable size.
I need to create a vector (index) that contains only the indices where 'strcmpi' returns the logical value 1. It works if 's2' contains only strings present in 's1', otherwiswe the following error occurs. I think that's because I am assigning to 'index' the size of 'k' but there will be only 3 logical value = 1, but I don't know how to fix it.
Any help would be appreciated. Thanks.
s1 = { 'FMO1','FMO2','FMO3','FMO4', 'BAO1', 'BAO2', 'BAO3', 'BAO4'};
s2 = {'mean','FMO1','BAO4','FMO2'};
for k = 1 : length(s2)
compare = strcmpi(s2{k},s1);
index(k) = find(compare==1)
end
Unable to perform assignment because the indices on the left side are not compatible with the size of the right side.
  1 Comment
Lorenzo Amedeo
Lorenzo Amedeo on 18 Jan 2023
Also thanks to you, do I have to accept your answer too? even if I already accepted the previous one

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Accepted Answer

Davide Masiello
Davide Masiello on 18 Jan 2023
index = [];
s1 = { 'FMO1','FMO2','FMO3','FMO4', 'BAO1', 'BAO2', 'BAO3', 'BAO4'};
s2 = {'mean','FMO1','BAO4','FMO2'};
for k = 1 : length(s2)
compare = strcmpi(s2{k},s1);
index = [index,find(compare==1)];
end
index
index = 1×3
1 8 2
This way, even if any of the entry in s2 appears several times in s1 you should be ok.

More Answers (1)

Stephen23
Stephen23 on 18 Jan 2023
The simple MATLAB approach:
s1 = { 'FMO1','FMO2','FMO3','FMO4', 'BAO1', 'BAO2', 'BAO3', 'BAO4'};
s2 = {'mean','FMO1','BAO4','FMO2'};
X = contains(s1,s2)
X = 1×8 logical array
1 1 0 0 0 0 0 1
Y = find(X) % optional
Y = 1×3
1 2 8
  1 Comment
Lorenzo Amedeo
Lorenzo Amedeo on 19 Jan 2023
Thank you, I would accept your answer but I don't think I can accept more than one.

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