st: Take the value from variable X if year equals 2010

[Torsten Häberle <haeberle.torsten@gmail.com>]

Hey,

I have the following table

Year      Adjustment factor       Dollar
2005              3                        500
2004              2                         200
2009              4                         300
2010              7                          400
2009              4                          200
2010              7                          100
....                   ...

Now I want to generate a new variable. The new variable is
Dollar * Adjustment factor of year 2010

--> Basically, I want to multiply all my dollar values with the
adjustment factor of 2010.

This seems easy, but I don't get it.
Something like:
gen newdollar = dollar*(adjustment factor if year=="2010")

Thanks
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/faqs/resources/statalist-faq/
*   http://www.ats.ucla.edu/stat/stata/