Description Usage Arguments Examples
Various functions to calculate the column products of a matrix, each with a different implementation.
1 2 3 4 5 6 7 8 9 10 11 |
x |
a numeric matrix |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 | ## Not run:
library(colprods)
# simple example -----
x = matrix(1:9, 3)
colprods_for_loop(x)
colprods_sapply(x)
colprods_apply(x)
colprods_rcpp(x)
colprods_rcpp_rowwise(x)
colprods_arma(x)
as.numeric(colprods_arma(x))
# benchmarking -----
library(microbenchmark)
# tall
nr = 1000
nc = 100
x = matrix(rnorm(nr * nc), nr, nc)
microbenchmark(
colprods_for_loop(x),
colprods_sapply(x),
colprods_apply(x),
colprods_rcpp(x),
colprods_rcpp_rowwise(x),
colprods_arma(x),
as.numeric(colprods_arma(x))
)
# wide
nr = 100
nc = 1000
x = matrix(rnorm(nr * nc), nr, nc)
microbenchmark(
colprods_for_loop(x),
colprods_apply(x),
colprods_sapply(x),
colprods_rcpp(x),
colprods_rcpp_rowwise(x),
colprods_arma(x),
as.numeric(colprods_arma(x))
)
## End(Not run)
|
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