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st: RE: Mata question: "matrix languages evaluate matrix expressions"?
My (somewhat informed) guess is that this is
absolutely nothing to do with a disclaimer
about lack of precision. There would be no
point in publishing Mata if it led to
compromises over precision.
More generally, as said earlier, I really
don't think you are going to get good answers
about such questions for the next two weeks
or so. StataCorp technical people are just way too busy.
It would be nice to be wrong on that, but
I doubt it.
> At the page
> it says "Everybody knows that matrix languages evaluate
> matrix expressions,
> such as b=invsym(X'X)*X'y, and Mata is no exception. Because of Mata's
> design, however, it is fast enough to work at the element level".
> This looks like a disclaimer of some sort about some loss of
> precision, but
> I got quite understand the implications of this.
> Can anybody clarify?
> How different is it (if any) from the way the same
> calculation was done in Stata8?
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