[R] Data.matrix fail to convert data.frame into matrix

[Gundala Viswanath]

Hi,

With the following codes, I attempt to convert
the data.frame into a matrix.

However I notice that data.matrix function doesn't
seem to work.

__ BEGIN__
dat <- read.table("mydata", comment.char = "!" , na.strings = "null");
# Select n-genes by random sample
# n = 1
nosamp <- 1
geneid <- sequence(nrow(dat))
geneid.samp <- sample(geneid,nosamp)
geneid.samp

gexp<- dat[geneid.samp,]
gexp.arr <- data.matrix(gexp, rownames.force = NA)
print(is.matrix(gexp.arr))
print(gexp.arr)

__END__

Yielding this output:

__BEGIN__
>  print(is.matrix(gexp.arr))
[1] TRUE
>  print(gexp.arr)
            V1     V2    V3    V4    V5    V6    V7    V8
10354 803.1 1107.8 431.6 349.8 386.7 646.3 744.2 620.9
__END__

I expect "gexp.arr" to be a plain vector (numeric).
What's wrong with my code above?





-- 
Gundala Viswanath
Jakarta-Indonesia