Hi,
Here is how to reproduce:
With a matrix of atomic type
----------------------------
m1 <- matrix(1:12, ncol=3,
dimnames=list(letters[1:4], LETTERS[1:3]))
typeof(m1)
# [1] "integer"
m1
# A B C
# a 1 5 9
# b 2 6 10
# c 3 7 11
# d 4 8 12
format(m1)
# A B C
# a " 1" " 5" " 9"
# b " 2" " 6" "10"
# c " 3" " 7" "11"
# d " 4" " 8" "12"
==> dim and dimnames are propagated.
With a matrix of type "list"
----------------------------
m2 <- matrix(rep(list(1:5, NULL, "AA"), 4), ncol=3,
dimnames=list(letters[1:4], LETTERS[1:3]))
typeof(m2)
# [1] "list"
m2
# A B C
# a Integer,5 NULL "AA"
# b NULL "AA" Integer,5
# c "AA" Integer,5 NULL
# d Integer,5 NULL "AA"
format(m2)
# [1] "1, 2, 3, 4, 5" "NULL" "AA" "1, 2, 3, 4, 5"
# [5] "NULL" "AA" "1, 2, 3, 4, 5" "NULL"
# [9] "AA" "1, 2, 3, 4, 5" "NULL" "AA"
==> dim and dimnames are dropped!
The same thing seems to happen with arrays of arbitrary dimensions.
Thanks,
H.
--
Hervé Pagès
Program in Computational Biology
Division of Public Health Sciences
Fred Hutchinson Cancer Research Center
1100 Fairview Ave. N, M1-B514
P.O. Box 19024
Seattle, WA 98109-1024
E-mail: hpa...@fredhutch.org
Phone: (206) 667-5791
Fax: (206) 667-1319
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