# Matrix display without row and column names?

I have this code in R:

seq1 <- seq(1:20)
mat <- matrix(seq1, 2)


and the result is:

     [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
[1,]    1    3    5    7    9   11   13   15   17    19
[2,]    2    4    6    8   10   12   14   16   18    20


Does R have an option to suppress the display of column names and row names so that I don't get the [,1] [,2] and so on?

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do you mean in the R console? or when you export from R? –  Justin Feb 20 '12 at 18:56
Also note that in R you don't need the semicolons at the end of the statement. And mat isn't a command. I'm assuming you mean matrix(seq1, 2) because your command doesn't work... –  Dason Feb 20 '12 at 19:09

If you want to retain the dimension names but just not print them, you can define a new print function.

print.matrix <- function(m){
write.table(format(m, justify="right"),
row.names=F, col.names=F, quote=F)
}

> print(mat)
1  3  5  7  9 11 13 15 17 19
2  4  6  8 10 12 14 16 18 20

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This works for matrices:

seq1 <- seq(1:20)
mat <- matrix(seq1, 2)

dimnames(mat) <-list(rep("", dim(mat)[1]), rep("", dim(mat)[2]))
mat

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