Nothing
library(stats)
library(float, quietly=TRUE)
library(rbenchmark)
set.seed(1234)
reps = 5
cols <- c("test", "replications", "elapsed", "relative")
m = 7500
n = 500
x = matrix(rnorm(m*n), m, n)
s = fl(x)
pca_spm = function(x)
{
p = svd(scale(x, TRUE, FALSE), nu=0)
p$d = p$d / max(1, sqrt(nrow(x) - 1))
names(p) = c("sdev", "rotation")
p
}
pca = function(x) prcomp(x, retx=FALSE)
benchmark(pca_spm(x), pca_spm(s), pca(x), replications=reps, columns=cols)
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