A matrix or array with one of its dimensions having zero elements looses its
dimension after multiplying with scalar.
Admittedly this is an extreme case, however it DOES make sense to retain an
objects formal structure after multiplying with a scalar, as e.g. a matrix
with zero rows IS a legal object in S. BTW, the prototype does retain the
dimension.
Best
Jens Oehlschlägel
# replication code at the end
# R1.5.1
m <- matrix(1, nrow=0, ncol=3)
m
[,1] [,2] [,3]
m*100
numeric(0)
m <- matrix(1, nrow=3, ncol=0)
m
m*100
numeric(0)
a <- array(1, dim=c(2, 2, 0))
a
a*100
numeric(0)
# Prototype
m <- matrix(1, nrow=0, ncol=3)
m
integer matrix: 0 rows, 3 columns.
m*100
integer matrix: 0 rows, 3 columns.
m <- matrix(1, nrow=3, ncol=0)
m
integer matrix: 3 rows, 0 columns.
m*100
integer matrix: 3 rows, 0 columns.
a <- array(1, dim=c(2, 2, 0))
a
integer array: 2 by 2 by 0
a*100
integer array: 2 by 2 by 0
# replication code
m <- matrix(1, nrow=0, ncol=3)
m
m*100
m <- matrix(1, nrow=3, ncol=0)
m
m*100
a <- array(1, dim=c(2, 2, 0))
a
a*100
version
_
platform i386-pc-mingw32
arch i386
os Win32
system i386, mingw32
status
major 1
minor 5.1
year 2002
month 06
day 17
language R
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