Limit length of a string

Question

Christian Günther 2023-1-16

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1894815-limit-length-of-a-string

回答： Christian Günther 2023-1-16

采纳的回答： Christian Günther

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Hello,

How can I limit the lengt of strings that I print out ?

text1 contains a sting of length 7 to 25, but I want to print a maximum of 18 charactes.

I have tried the following, but it does not work for text1:

text1='012345678901234567890123456789';
text2='01234567';
sprintf('%-18s',text1)
ans = '012345678901234567890123456789'
sprintf('%-18s',text2)
ans = '01234567          '

In the end it should look like a table.

Best regards

Christian

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Answer 1

Christian Günther 2023-1-16

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https://ww2.mathworks.cn/matlabcentral/answers/1894815-limit-length-of-a-string#answer_1149750

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Hello,

I've found the solution myself:

with this command it gests truncated to 18 characters:

sprintf('%+18.18s',text1)

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Answer 2

Matt J 2023-1-16

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text1='012345678901234567890123456789';
text2='01234567';
text1(19:end)=''
text1 = '012345678901234567'
text2(19:end)=''
text2 = '01234567'

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Christian Günther 2023-1-16

Hello,

Thanks for the reply.

It is working, but I need to overwrite each string before using it.

Thanks !!

Matt J 2023-1-16

编辑：Matt J 2023-1-16

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Wrap the steps in some function,

text1='012345678901234567890123456789';
text2='01234567';
trunctext(text1)
012345678901234567
trunctext(text2)
01234567
function trunctext(T)
  T(19:end)='';
  disp(T)
end

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Answer 3

Walter Roberson 2023-1-16

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1894815-limit-length-of-a-string#answer_1149595

https://www.mathworks.com/help/matlab/ref/extractbefore.html

This can be used in an expression without modifying the variable. Also it can be used with string() objects as well

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Christian Günther 2023-1-16

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this is failing for text2:

text2='01234567';
sprintf('%+18s',extractBefore(text2,18))
% Error using extractBefore (line 51)
% Numeric value exceeds the number of characters in element 1.