how to count the number of variables after split?

[Vivian Zijin Xu]

Dear All,

How to generate a new variable that equals the number of variables generated after split? I need to record the number each time I run split for a different variable in a loop. Thanks a lot!

Vivian

[Nick Cox]

See the help.

split stores the following in r():

Scalars
r(nvars) number of new variables created
r(varlist) names of newly created variables

clear
input str42 foo
"frog toad" 
"frog toad newt" 
end 

split foo 

local n1 = r(nvars) 
di `n1'

The result shown is 3.

Putting the result in a variable is legal but unnecessary. Use a local macro.

[Vivian Zijin Xu]

See the help.

clear
input str42 foo
"frog toad"
"frog toad newt"
end

split foo

local n1 = r(nvars)
di `n1'

The result shown is 3.

Putting the result in a variable is legal but unnecessary. Use a local macro.

Thank you Nick, problem solved. I skipped this part of the help manual, will be more cautious in the future.