How to check the numbers of characters of a string?

2012 10 31
5 个回答
回答已采纳
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0 个投票

e.g I have a string, abcde. And I need a checker to check whether the string has 5 characters before executing a command.

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 采纳的回答

Pedro Villena
Pedro Villena 2012-10-31
编辑：Pedro Villena 2012-10-31

1 个投票

str = num2str([17;10],'%05i')
if length(str(1,:))==5,
%%%here is your command
end
or
str = num2str([17;10],'%05i')
if numel(str(1,:))==5,
%%%here is your command
end

3 个评论
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Sean de Wolski
Sean de Wolski 2012-10-31
This won't work, consider:
num2str([17;10],'%05i')
ans =
00017
00010
length(ans)
Matt Fig
Matt Fig 2012-10-31
Better to use NUMEL, for generality.
S = ['ertyu';'poiuy';'lkjhg';'nbvcx']
length(S)
numel(S)
Matt Fig
Matt Fig 2012-10-31
I should have hit refresh, I guess ;-).

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更多回答（4 个）

manoj saini
manoj saini 2012-10-31

0 个投票

>>a='string'; >>n=length(a) so n will return length of a string
Ze Kai Ng
Ze Kai Ng 2012-10-31

0 个投票

I converted my string into vector form and cannot count using length(str).
Ze Kai Ng
Ze Kai Ng 2012-10-31

0 个投票

Thank you everybody! I figured it out. I need to char(vec(pos)) first to convert to string then I can compare with the above methods.

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