On Thu, 30 Dec 2004 [EMAIL PROTECTED] wrote:
Hello,
Is it intended that is.vector(...) and is(..., "vector") do not always give identical results?
Yes. They both work as documented, as you note below. People have often pointed out that is.vector is a slightly misleading name, and it might have been better if that function had been called something like is.bare.vector() back in the Disco Age when it was created. But it wasn't.
-thomas
is.vector() works as documented ('is.vector' returns 'FALSE' if 'x' has any attributes except names.) Thus,
A <- array(1:2, 1:2) M <- diag(2)
is.vector(M) # FALSE, as documented # and is.vector(A) # FALSE, as documented
# however is(M, "vector") # TRUE is(A, "vector") # TRUE
# which is also correct, since extends("matrix", "vector") extends("array", "vector")
I'm working with R Version 2.0.1 Patched (2004-12-09) on Windows 2000.
Thanks, for any comments! Matthias
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Thomas Lumley Assoc. Professor, Biostatistics [EMAIL PROTECTED] University of Washington, Seattle
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