Foreach in mata

[Dario Maimone Ansaldo Patti]

Dear All,

just a quick question. Is it possible to use foreach within a mata function?

Suppose I have something lke:

mata:
foreach v of global regressors{
    D = 1 :/ W_`v'
    W_`v'2 =  editmissing(1 :/ (D:^2), 0)
}
end

I gen the following error message:

. mata:
------------------------------------------------- mata (type end to exit) -----------------------------------
: foreach v of global regressors{
'global' found where almost anything else expected
(3 lines skipped)
-------------------------------------------------------------------------------------------------------------

Is there any mistake in my code or is it not possible to include foreach in mata? If not, is there a way to work this around?

Thanks in advance.

[Maarten Buis]

foreach does not exist in Mata. You might get somewhere with code like this

local regressors foreign mpg
mata
    regressors = st_local("regressors")
    regressors
    regressors = tokens(regressors)
    regressors
    for (i = 1 ; i <= cols(regressors) ; i++) {
        regressors[i]
    }
end