comma insertion in array

I would like to add commas between array values.

for example, I have a array A.

A = [1 2 3];

I would like to get a list of B from A.

B = [1, 2, 3];

How can I do this?

[KSSV]

You want to write B in text file? Why you want commas? What's the purpose?

[병극 조]

Yes, I want to write B in text file.

Thank you.

[Rik]

Just to clarify: A is a Matlab variable, and B should be the char vector '[1, 2, 3]'?

[병극 조]

no type change. I just want to put commas.

Thank you.

Answer 1

[KSSV]

A = [1 2 3] ;
dlmwrite('test.txt',A)

[병극 조]

This is what I want. Thank you very much.

[KSSV]

Thanks is accepting/ voting the answer. :)