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How to create a string array with long strings that continue to a new line?

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Tuukka Takala
Tuukka Takala on 8 Apr 2021 at 13:23
Commented: Tuukka Takala on 8 Apr 2021 at 13:54
I ran into curious behavior with Matlab R2020b, when I tried to manually create a string array with really long strings that continue to a new line.
In the below examples I have shortened the strings for the sake of readability.
I was surprised that the following input does not concatenate the double "aa"s and "cc"s into individual strings "aaaa" and "cccc".
["aa" ...
"aa", "bbbb", "cc" ...
"cc"]
Instead you get:
ans =
1×5 string array
"aa" "aa" "bbbb" "cc" "cc"
I also tried the following, which results in to a string instead of string array:
['aa' ...
'aa', 'bbbb', 'cc' ...
'cc']
ans =
'aaaabbbbcccc'
Is there a nice way to get what I want, i.e:
1×5 string array
"aaaa" "bbbb" "cccc"
Currently I'm building the string array by adding a new string in separate statements, which is not very elegant.

Accepted Answer

Jan
Jan on 8 Apr 2021 at 13:38
Edited: Jan on 8 Apr 2021 at 13:41
This is not curious, but the expected behaviour. Matlab inserts commas for separating the elements of a vector automatically.
Use + to concatenate strings:
["aa" + ...
"aa", "bbbb", "cc" + ...
"cc"]
ans = 1×3 string array
"aaaa" "bbbb" "cccc"
Note that 'abc' is a "char vector", not a "string". Confusingly {'abc'} is called a "cell string", although it is a "cell array of chat vectors". The cause of this confusion is that the "string" class has been introduced in 2016 and the term "string" was used for char vectors before.
With char vectors use the concatenation operator [ ] to join the subvectors and create a cell array using { }:
{['aa' ...
'aa'], 'bbbb', ['cc' ...
'cc']}
  1 Comment
Tuukka Takala
Tuukka Takala on 8 Apr 2021 at 13:54
Thanks for the thorough answer! I actually tried the + operator, but only with char vectors ['aa' + 'aa'] which just summed the numerical representations of the characters...

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More Answers (1)

Fangjun Jiang
Fangjun Jiang on 8 Apr 2021 at 13:37
Edited: Fangjun Jiang on 8 Apr 2021 at 13:38
s=["aa"+ ...
"aa", "bb"+ ...
"bb"]
s =
1×2 string array
"aaaa" "bbbb"

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