How to return a value to a stata program?

[Ingrid Qiu]

Hi Statalisters,

I want to call another program (var_num) in a Stata program (quantile_reg). But I don't know how to receive the returned value from var_num. Attached are the codes. Appreciate for your help!!


capture program drop quantile_reg
program quantile_reg,eclass
version 12
syntax varlist(min=2) [if] [in]
tokenize `varlist'
marksample touse

var_num varlist

mata: mydata(r(N)-1)

getmata (myvar*)=X,replace
qreg `1' myvar*,quantile(0.25)
ereturn list


end



capture program drop var_num
program var_num,rclass
version 12
syntax varlist(min=2) [if] [in]
tokenize `varlist'
marksample touse

quietly{
count if `varlist'!=.
return scalar N = r(N)
}
end

capture mata mata drop mydata()
version 12
mata:
void mydata(real scalar num)
{
st_view(X=.,.,(2..(num)))
st_view(tau=.,1,num+1)
}
end