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Truncate strings to maximum length

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DNF
DNF 2023-2-16
编辑： Jan 2023-2-16
I have an array of strings (new strings, not old character arrays) of varying lengths, and I would like to truncate them to below some maximum length. I thought that extractBefore would be helpful, but it fails for strings shorter than the truncation length.
>> str = ["ab", "cdefg"];
>> extractBefore(str, 3) % this works fine
ans =
1×2 string array
"ab" "cd"
>> extractBefore(str, 4) % this fails
Error using extractBefore
Numeric value exceeds the number of characters in element 1.
This is my current solution:
>> arrayfun(@(s)extractBefore(s, min(4, s.strlength())+1), str)
ans =
1×2 string array
"ab" "cdef"
However, this is awkward and difficult to read.
Is there no ready-made functionality for doing this?

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回答（2 个）

Jan
Jan 2023-2-16
编辑：Jan 2023-2-16
Ran in:
Omit arrayfun:
str = ["ab", "cdefg"];
extractBefore(str, min(4, str.strlength())+1)
ans = 1×2 string array
"ab" "cdef"
If this still looks to clumsy, write your own function:
limitWidth(str, 4)
function s = limitWidth(s, n)
s = extractBefore(s, min(n, s.strlength()) + 1);
end
Stephen23
Stephen23 2023-2-16
Ran in:
str = ["ab", "cdefg"];
out = regexp(str,'^.{1,4}','match','once')
out = 1×2 string array
"ab" "cdef"

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