st: combinig two variables into one

[pgupta@worldbank.org]

Hi

I have two variables which I need to use to generate a new variable. to be more
specific, suppose I have variable X (which is a numeric string) and variable Y
(which is numeric). the observations are as follows:

X                                      Y

2  23  3000                    2
212343000                   3
2     4       20                 12

and I need to generate a new variable, say Z which looks like

Z
2  23  3000  2
212343000  3
2    4        2012


can someone suggest whats the best way of handling this problem?

Thx
Pooja Gupta


*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/