MATLAB Answers

Remove cell that contains strings of another cell array

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chlor thanks
chlor thanks on 8 Aug 2016
Answered: Sean Mahnken on 28 Mar 2019
Input:
a={'Time12:30','Time12:40','Time1:40', 'Time2:40'};
b={'12:', '1:'};
Wanted Output: (delete from "a" all cells containing string listed in "b")
a={'Time2:40'}
I have tried:
for k = 1 : length(a)
for kk = 1 : length(b)
if any(~ismember(b{kk}, a{k}))
a(k) = [];
break;
end
end
end
However this gives me error of such:
Index exceeds matrix dimensions.
I am confused by the error and any guidance is appreciated! Thank you for reading my post.

Accepted Answer

James Tursa
James Tursa on 8 Aug 2016
Edited: James Tursa on 8 Aug 2016
You are changing the size of a in the loop with this line:
a(k) = [];
So subsequent iteration indexes that depend on the length of a will fail. Maybe save the indexes to delete in the loop, and then delete them all at once at the end. E.g., something like this:
a={'Time12:30','Time12:40','Time1:40', 'Time2:40'};
b={'12:', '1:'};
x = false(size(a)); % <-- Indexes to delete, start out nobody deleted
for k=1:numel(b)
x = x | ~cellfun(@isempty,strfind(a,b{k})); % <-- Flag the ones that b{k} matches
end
a(x) = []; % <-- Delete all the flagged lines at once

More Answers (2)


Sean Mahnken
Sean Mahnken on 28 Mar 2019
You should be able to just do the k loop backwards:
for k = length(a):-1:1
for kk = 1 : length(b)
if any(~ismember(b{kk}, a{k}))
a(k) = [];
break;
end
end
end

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