Looping with both `var' and `i' simultaneously

[Reese Crispen]

Hello,

I want to loop over my variable list, but also be able to have a number `i' that reflects the loop iteration.

foreach var in varlist *{
[command using loop iteration `i' and `var']
}

Is there a way to have both of these in the loop? Or another way to accomplish?

All I know how to do is manually create a list of locals like this with the whole varlist:

local variable1 make
local variable2 price 
local variable3 mpg
[...]

Then loop with i = 1/n and variable`i'

But is there a way to do this without making that local list manually?


Thanks for any help!

Reese

[Mike Lacy]

local i = 0
foreach var in varlist * {
   local ++i
   [command using loop iteration `i' and `var']
}

[Reese Crispen]

Perfect, thank you Mike!

p.s. I'd like to learn more about use of "++", can you (or anyone else) direct me on where to look or what it's called?

[William Lisowski]

The output of help macro shows the syntax but doesn't say anything about what it does. You can find a description of "macro increment and decrement functions" in Sections 18.3.4 and 18.3.7 of the Stata User's Guide PDF included in your Stata installation and accessible from Stata's Help menu.

[Reese Crispen]

Thanks William! That's exactly what I was looking for.