st: Loop: match of variables

[Nick Bornschein <nick.bornschein@gmail.com>]

Hello,

I have written the following loop, but there is a mistake when creating 
the graphs I cannot solve.
First of all, I have an ordered list of x variables and an ordered list 
of y variables. I want to create an graph (tsline) with 2 lines, where I 
want use the first variable of the x variables and the first variable of 
the y variables, then I want to create the next graph with 2 lines with 
the second variable of the x variables and the second variable of the y 
variables. How can I write that into the loop?


foreach x of varlist apple-biorad {
    foreach y of varlist apple_m30-biorad_m30 {
      tsline `x' if datum >= `=date("01jan2010", "DMY")' || tsline `y' 
if datum >= `=date("01jan2010", "DMY")'
      graph export Grafiken/`x'_m30.png, replace
    }
}
*
*   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/