strcat including space (i.e, ' ')

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R P
R P 2011-6-11
回答： Jy·Li 2023-5-25
I have to concatenate words, including spaces
Ex. a='word1'; b='word2';c=strcat(a,' ',b);
I need 'word1 word2', however, the value on c is 'word1word2'
Can you help me?

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Walter Roberson
Walter Roberson 2011-6-11
编辑：MathWorks Support Team 2018-11-8
To include spaces when concatenating character vectors, use square brackets.
a = 'word1';
b = 'word2';
c = [a ' ' b]
The “ strcat ” function ignores trailing whitespace characters in character vectors. However, “strcat” preserves them in cell arrays of character vectors or string arrays.
a = {'word1'};
b = {'word2'};
c = strcat(a,{' '},b)
You also can use the “plus” operator to combine strings. Starting in R2017a, use double quotes to create strings. For more information on strings, see the “ string ” data type.
a = "word1";
b = "word2";
c = a + " " + b
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Captain Karnage
Captain Karnage 2022-8-26
编辑：Voss 2022-8-26
Ran in:
FYI for anyone else reading, I had a cell array of strings and I wanted to concatenate the same string (with a space in it) to each of the strings in the cell array (no spaces in these strings). The square bracket (first) method of course doesn't work, neither does the "plus" operator (third/last) method for that. However, the "strcat" using a single cell array with a space (2nd/middle above) method does work.
To specifically show an example:
a = 'Addme';
b = { 'to', 'each', 'one', 'of', 'these', 'words', 'with', 'a', 'space'};
c = strcat(a,{' '},b)
c = 1×9 cell array
{'Addme to'} {'Addme each'} {'Addme one'} {'Addme of'} {'Addme these'} {'Addme words'} {'Addme with'} {'Addme a'} {'Addme space'}
Walter Roberson
Walter Roberson 2022-8-26
编辑：Walter Roberson 2022-8-26
Ran in:
a = 'Addme';
b = { 'to', 'each', 'one', 'of', 'these', 'words', 'with', 'a', 'space'};
strjoin([a, b])
ans = 'Addme to each one of these words with a space'
a + " " + b
ans = 1×9 string array
"Addme to" "Addme each" "Addme one" "Addme of" "Addme these" "Addme words" "Addme with" "Addme a" "Addme space"

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更多回答（4 个）

Paulo Silva
Paulo Silva 2011-6-11
c=[a ' ' b]
strcat ignores trailing ASCII white space characters and omits all such characters from the output. White space characters in ASCII are space, newline, carriage return, tab, vertical tab, or form-feed characters, all of which return a true response from the MATLAB isspace function. Use the concatenation syntax [s1 s2 s3 ...] to preserve trailing spaces. strcat does not ignore inputs that are cell arrays of strings.
Reference
  2 个评论
Daniel Foose
Daniel Foose 2018-2-23
This is better than the accepted answer because it keeps the type the same. The accepted answer returns a cell with a string in it (which is different from a string). This answer returns a string.
Walter Roberson
Walter Roberson 2018-2-23
The accepted answer returns a cell with a character vector in it. Strings did not exist in R2011a. If strings were being used then you would use a different approach:
>> a = "word1"; b = "word2"; a + " " + b
ans =
"word1 word2"
This requires R2017a or later. For R2016b,
>> a = string('word1'); b = string('word2'); a + ' ' + b
and before R2016b strings did not exist.

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Jy·Li
Jy·Li 2023-5-25
c=strcat(a,32,b); % the unicode value of ' ' is 32
Usman Nawaz
Usman Nawaz 2020-9-6
use double quotes instead of single quotes, worked for me.
  1 个评论
Walter Roberson
Walter Roberson 2020-9-6
That can be useful, but the output would be a string() object instead of a character vector. string() objects can be useful, but they need slightly different handling than character vectors.
string() objects became available in R2016b; using double-quotes to indicate string objects became available in R2017a.

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R P
R P 2011-6-11
Thank you, Walter
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Walter Roberson
Walter Roberson 2011-6-11
>> strcat({'word1'},{' '},{'word2'})
ans =
'word1 word2'
You can dereference this or cell2mat it if you want the string itself as output.
Jan
Jan 2011-6-11
@Walter: CELL2MAT is not efficient here. S{1} is nicer.

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