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2003 Feb 27
0
unwanted coercion of length 0 vectors (PR#2587)
...; x1
[1] NA
test> mode( x1)
[1] "numeric"
No coercion was required because 'logical' (the default mode of NA) is
"ancestral" to 'numeric'. Note also that assigning to a hitherto
non-existent element of x1, e.g. x1[2]_ NA, also does not coerce.
But:
test> x0_ numeric( 0)
test> x0[1]_ NA
test> mode( x0)
[1] "logical"
Similar things happen with vectors of mode 'complex' and even 'character':
test> xc0_ complex( 0)
test> xc0[1]_ 3
test> mode( xc0)
[1] "numeric" # should be 'complex'
test> xch...