join is the opposite of split:

my @a = qw(IBM B 226110 20020702 545 12.5109);
@a = join(',',@a);
print "@a\n";
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But i usually store the results in a scalar, not an array, because join returns a scalar. Update: i did not realize you were working with an array of arrays when i answered ... sorry about that.

jeffa

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)