st: RE: Foreach loop for subsequent variables

[Nick Cox <n.j.cox@durham.ac.uk>]

Let's suppose your variables run var1 ... var42 so that the last pair is var41-var42. 

Then first I would use -forvalues- here. It is easier and a smidgen faster. 

forval i = 1(2)41 { 

	local j = `i' + 1 
	<whatever> var`i' var`j' 

} 

You can also go 

forval i = 1(2)41 { 

	<whatever> var`i' var`=`i'+1' 

}

See [U] 18.3.8 and -help macro-. 

Nick 
n.j.cox@durham.ac.uk 

Dmitriy Glumov

I have recently begun to use Stata and have run into the problem
writing a foreach loop. I have a large dataset of variables, paired in
a way that var1 and var2 are together, var3 and var4 are together, and
so on. I am writing a foreach loop for each individual odd variable
and, everytime the program loops, I need to include a subsequent even
variable as well. So, for example, given that var1 is `x', I need to
include var2 into the program, too (in essence, `x' + 1). The problem
doesn't seem to be very difficult, and I am sure there is a simple
solution to it, but I just can't find it anywhere. Thank you for your
consideration, any help would be greatly appreciated!


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