On Thu, 30 Dec 2004 [EMAIL PROTECTED] wrote:
Is it intended that is.vector(...) and is(..., "vector") do not always give identical results?
Yes. What makes you think they are anything to so with each other? The S4 class "vector" is quite distinct from the usage in base R.
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.
-- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595
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