How to insert space between strings while doing strcat ?

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Student S
Student S 2015-10-31
编辑： Stephen23 2021-4-26
for eg: a='hello'; b='world'; strcat(a,b);
strcat(a,b) gives 'helloworld' But I need it as 'hello world' How can I do that ?

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采纳的回答

Star Strider
Star Strider 2015-10-31
Use the square bracket [] concatenation operator, and including a space variable is the easiest way:
a='hello';
b='world';
s = ' ';
Result = [a,s,b]
Result =
hello world
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Giuseppe Degan Di Dieco
Giuseppe Degan Di Dieco 2021-4-26
Thank you Star, you know, the most simple things are always underestimated, but actually the most difficult to found.
Best!

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更多回答（4 个）

Hugh
Hugh 2017-11-21
I like to use the ASCII space character for this situation, code "32". for the OP: strcat(a,32,b) Extension: I would be inclined to also include a comma, code "44": strcat(a,44,32,b)
I look up the characters at: http://www.asciitable.com/
Walter Roberson
Walter Roberson 2018-5-5
There is a trick to strcat. Notice from the documentation,
"For character array inputs, strcat removes trailing ASCII white-space characters: space, tab, vertical tab, newline, carriage return, and form feed. For cell and string array inputs, strcat does not remove trailing white space."
This means that if you have
strcat(a, ' ', b)
then the "trailing" space of the ' ' input will be removed, which will have the effect of running the entries together. The trick is to use
strcat(a, {' '}, b)
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Walter Roberson
Walter Roberson 2019-2-6
a = {'hello';'bye'};
b = {'dolly';'louis'};
>> strcat(a, {' '}, b)
ans =
2×1 cell array
{'hello dolly'}
{'bye louis' }
No need to replicate the {' '}
Giuseppe Degan Di Dieco
Giuseppe Degan Di Dieco 2021-4-26
Hello everybody,
all your solutions are brilliant, and lead to the same result.
Thanks for your help and time!

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Stephen23
Stephen23 2015-11-1
编辑：Stephen23 2021-4-26
The most efficient approach is to use sprintf:
>> a = 'hello';
>> b = 'world!';
>> sprintf('%s %s',a,b)
hello world!
Larissa Bene
Larissa Bene 2018-5-5
strcat(string1, " "); strcat(string1, string2);
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Renwick Beattie
Renwick Beattie 2019-2-6
I get the following error on the " character
Error: The input character is not valid in MATLAB
statements or expressions.
Walter Roberson
Walter Roberson 2019-2-6
" is only valid in MATLAB from R2017a onwards. string() objects started existing in R2016b, but the input syntax of " was not enabled until R2017a.

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