st: double loops with "forvalues"

[xueliansharon <xuelianstata@gmail.com>]

Dear all,

I want to do a double looping, the commands are as follows: 

forvalues i=1944/1955 {
	forvalues j=2106/2117 {
		gen fa`i'=f`i' if fr==1
		replace fa`i'=f`j' if fr==0
	}
}

The purpose is to generate 12 new variables (fa1944, fa1945, fa1946, ...,
fa1955) with the following characteristics: 
fa1944=f1944 if fr==1; fa1944=f2106 if fr==0
fa1945=f1945 if fr==1; fa1945=f2107 if fr==0
fa1946=f1946 if fr==1; fa1946=f2108 if fr==0
...
fa1955=f1955 if fr==1; fa1955=f2117 if fr==0

However, whenever I run this program, Stata always returns an error message
as "fa1944 already defined". Could you please tell me how I should modify
the program?

Thank you very much!

Best,
Xuelian

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