st: generate stata variables in mata and set the names from matrices

[Cyrus Levy <levy.cyrus@gmail.com>]

I want to generate stata variables in mata, and set the names of those 
variables using a mata matrix. I use the code below which is supposed to 
work -it works when I enter the lines line by line-, but then when I run 
it in a do file, it doesn't work. It doesn't generate a HHI_R50 
variable. It generates a HHI_R variable with no extension referring to 
the corresponding matrix value. What's wrong?

...
mata
...
radian=(50,75,200)
  for (rd=1; rd<=cols(radian); rd++) {
...
        st_matrix("radian", radian)
        st_numscalar("rd", rd)
        stata(`"local namer=radian[1,rd]"')
        stata("gen HHI_R`namer'=.")
        st_store(., "HHI_R`namer'", HHI_R)
}
end
...

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