strcat including space (i.e, ' ')
显示 更早的评论
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?
采纳的回答
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
6 个评论
Paulo Silva
2011-6-11
Walter I'm sorry but this time I have to disagree with your answer, you said strcat({'word1'},{' '},{'word2'}) but that doesn't work properly for the question and example, that's working with cells (input and output) and the user just wants strings.
Walter Roberson
2011-6-11
So? The user also wanted variables instead of constants. I illustrated the principle and the user can adapt from there, such as using
c = char(strcat(a,{' '},b));
Jan
2011-6-11
@CELL/STRCAT is a not efficiently implemented M-function. It is easy to improve it and remove the strange deleting of marinal spaces. This behaviour is kept from the Matlab 4 times, before CELL-strings allowed to create a container for strings of different lengths.
Paulo Silva
2011-6-12
variables, constants, strings and cells
Too many assumptions for such small question but it's all ok
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)
a = 'Addme';
b = { 'to', 'each', 'one', 'of', 'these', 'words', 'with', 'a', 'space'};
strjoin([a, b])
a + " " + b
更多回答（4 个）
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.
2 个评论
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
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.
Jy·Li
2023-5-25
3 个投票
c=strcat(a,32,b); % the unicode value of ' ' is 32
Usman Nawaz
2020-9-6
2 个投票
use double quotes instead of single quotes, worked for me.
1 个评论
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.
R P
2011-6-11
0 个投票
3 个评论
Paulo Silva
2011-6-11
Please always test the answers provided before accepting them, Walter answer isn't correct (this time).
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
2011-6-11
@Walter: CELL2MAT is not efficient here. S{1} is nicer.
类别
在 帮助中心 和 File Exchange 中查找有关 Characters and Strings 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
