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Re: st: Missing Values in Matrices
At 08:04 25/09/02 -0500, Bill Gould wrote:
What precisely is a NaN? And does it have any connection with missing
values, or with the "magic number" 1e300 mentioned in -[R] tabstat-? I
can't find any reference to NaNs in -[R] matrix define-.
While I am very sympathetic to Nick's desire to store missing values in
matrices, I was not aware of the above and it should be treated as a bug --
something we at StataCorp need to fix -- and not a feature.
What is in fact being stored in the matrix is a NaN and, in the -generate-
follow on -- where missing values are expected -- Stata's NaN protection code
is detecting the NaN and converting it to a missing value. Somehow that NaN
snuck through matrix assignment, however, and unfortunately, the other matrix
routines are not up to dealing with it.
Thanks in advance
Lecturer in Medical Statistics
Department of Public Health Sciences
King's College London
5th Floor, Capital House
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Tel: 020 7848 6648 International +44 20 7848 6648
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Opinions expressed are those of the author, not the institution.
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