swap letters 2 by 2 in a string.
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how cani i swap letters 2 by 2 in a string?. (in other word: abcdefg would become badcfeg)
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Answers (3)
Matt Fig
on 12 Nov 2012
Edited: Matt Fig
on 12 Nov 2012
S = 'abcdefg'
S = S([2 1 4 3 6 5 7])
Or, generally:
for ii=1:2:numel(S)-mod(numel(S),2),S([ii,ii+1])=S([ii+1,ii]),end
2 Comments
Matt Fig
on 13 Nov 2012
Edited: Matt Fig
on 13 Nov 2012
What do you mean it repeats 9 times? When I run that FOR loop then type:
>> S
S =
badcfeg
No repeating 9 times here. Do you mean that it displays several times during the loop? Simply put a semicolon in after the assignment in the loop. I left it out so you could see what was going on. I assumed you would know to put it back in if you wanted to do so. I.e., instead of:
S([ii,ii+1])=S([ii+1,ii]),
use:
S([ii,ii+1])=S([ii+1,ii]); % Notice the ; instead of ,
Incidentally, I like this one better:
for ii=2:2:numel(S),S([ii-1,ii])=S([ii,ii-1]);end
Sean de Wolski
on 12 Nov 2012
str = 'a':'g';
eo = mod(numel(str),2); %even odd
str(1:end-eo) = flipud(reshape(str(1:end-eo),2,[])) %swap
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Azzi Abdelmalek
on 12 Nov 2012
Edited: Azzi Abdelmalek
on 12 Nov 2012
s='abcdefg';
m=fix(numel(s)/2)*2
s(1:m)=reshape(flipud(reshape(s(1:m),2,[])),1,[])
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