On Jan 31, 2008 8:48 PM, Gabi Huiber <[email protected]> wrote:
> I'm trying to cheat and speed things up a bit when dealing with a
> bunch of files with names such as fileYYYYMMDD.dta. I could collect
> the numeric part of the names in a column vector that starts with the
> initial values a=J({potential number of files}, 1,0). But there is a
> fair chance that my YYYYMMDD succession has gaps, so at the end of the
> process this column vector will have some zeroes.
>
> I would like to do this:
>
> mata
> a=sort(a,1)
>
> Then drop all the zero elements of a, and end up with a shorter
> vector. But I can't find anything like "drop rows" in the Mata book or
> Google. Any ideas?
-select()- ?
mata
A = (1,2,3,4,0,5,6,0,0,7)
A2 = select(A, A:>0)
A2
end
> Generally, some R-like way to deal with arrays would be nice to have
> in Mata or Stata.
How do R arrays work?
Scott
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