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In Matlab I have integer array a=[1 2 3]. I need to convert them into one string, separated by ',':

c = '1,2,3'

If somehow I can have a string array b=['1' '2' '3'], then I can use 

c = strjoin(b, ',')

to achieve the goal.

So my question is: How to convert integer array a=[1 2 3] into a string array b=['1' '2' '3']?

The int2str() is not working. It will give out

'1 2 3'

and it is not a "string array", so the strjoin can not apply to it to achieve '1,2,3'

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Thanks for the 3 answers that can get the c = '1,2,3' . But my own answer below is the only one that actually "convert int array into string array" :) –  Ben Lin Jun 5 '13 at 1:40
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4 Answers

up vote 2 down vote accepted

You can simply use sprintf():

a = 1:3;
c = sprintf('%d,',a);
c = c(1:end-1);
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+1 - I did not know this! –  n00dle Jun 4 '13 at 22:53
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up vote 2 down vote

There's a function in the file exchange called vec2str that'll do this.

You'll need to set the encloseFlag parameter to 0 to remove the square brackets. Example:

a = [1 2 3];
b = vec2str(a,[],[],0);

Inside b you'll have:

b = 
    '1,2,3'
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sounds good, but not as simple as Oleg's solution, especially when it requires downloading a file :) –  Ben Lin Jun 4 '13 at 23:10
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up vote 1 down vote

I found one solution myself:

after getting the string (not array), split it:

b = int2str();   %b='1  2  3'
c = strsplit(b); %c='1' '2' '3'

Then I can get the result c=strjoin(c, ',') as I wanted.

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up vote 1 down vote

You can use:

c = regexprep(num2str(a), '\s*', ',');
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