Hello,
Is it intended that is.vector(...) and is(..., "vector")
do not always give identical results?
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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