Description Usage Format References Examples
A microarray data set with 8038 logged gene expression levels measured on 5 rats. All rats were subjected to the same treatment. The rows correspond to the genes and the columns refer to the rats.
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A matrix with 8038 rows corresponding to the measured genes and 5 columns corresponding to the rats.
Davidson, L.A., Nguyen, D.V., Hokanson, R.M., Callaway, E.S., Isett, R.B., Turner, N.D., Dougherty, E.R., Wang, N., Lupton, J.R., Carroll, R.J., and Chapkin, R.S. (2004). Chemopreventive n-3 polyunsaturated fatty acids reprogram genetic signatures during colon cancer initiation and progression in the rat. Cancer Research, 64, 6797–6804.
1 2 3 4 5 6 7 8 9 10 11 12 13 | data(Rat)
X <- Rat
k <- dim(X)[1]
### Estimated densities of logged gene expression levels.
s <- apply(X, 1, density)
### Plot of estimated densities of 6 randomly selected genes.
set.seed(375)
rs <- sample(1:k, 6)
plot(s[[rs[1]]], main = "Kernel estimates for 6 randomly selected genes",
xlab = "x", ylab = "density", xlim = c(-4, 2), ylim = c(0, 6))
for (i in 2:6){
lines(s[[rs[i]]], col = i)
}
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