If argument big.mark is supplied. Like so:
> version _
platform i686-redhat-linux-gnu
arch i686
os linux-gnu
system i686, linux-gnu
status
major 2
minor 2.0
year 2005
month 10
day 06
svn rev 35749
language R
> mat <- matrix(1:6, 3)
> mat
[,1] [,2]
[1,] 1 4
[2,] 2 5
[3,] 3 6
> format(mat)
[,1] [,2]
[1,] "1" "4"
[2,] "2" "5"
[3,] "3" "6"
> format(mat, big.mark = ",")
[1] "1" "2" "3" "4" "5" "6"
>
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