清空筛选条件
清空筛选条件

swap letters 2 by 2 in a string.

2 次查看（过去 30 天）
Mohammed
Mohammed 2012-11-12
how cani i swap letters 2 by 2 in a string?. (in other word: abcdefg would become badcfeg)

请先登录，再回答此问题。

回答（3 个）

Matt Fig
Matt Fig 2012-11-12
编辑：Matt Fig 2012-11-12
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 个评论
Mohammed
Mohammed 2012-11-13
it works, but the for loop make the string repeat 9 times!
Matt Fig
Matt Fig 2012-11-13
编辑：Matt Fig 2012-11-13
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

请先登录，再进行评论。

Sean de Wolski
Sean de Wolski 2012-11-12
str = 'a':'g';
eo = mod(numel(str),2); %even odd
str(1:end-eo) = flipud(reshape(str(1:end-eo),2,[])) %swap
Azzi Abdelmalek
Azzi Abdelmalek 2012-11-12
编辑：Azzi Abdelmalek 2012-11-12
s='abcdefg';
m=fix(numel(s)/2)*2
s(1:m)=reshape(flipud(reshape(s(1:m),2,[])),1,[])

类别

在 Help Center 和 File Exchange 中查找有关 Data Type Conversion 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by