Created
September 8, 2022 02:14
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library(rbenchmark) | |
library(Matrix) | |
ncol <- 2e3 | |
nrow <- 1e3 | |
x <- matrix(rbinom(ncol * nrow, 1, 0.1), nrow = nrow, ncol = ncol) | |
benchmark( | |
which(x != 0, arr.ind = T), # method 0 | |
which(Matrix(x, sparse = T) != 0, arr.ind = T), # method 1 | |
Matrix(x, sparse = T) |> # method 2 | |
(\(foo) { | |
colN <- diff(foo@p) | |
cbind(foo@i + 1, rep(seq_along(colN), colN)) | |
})(), | |
replications = 100 | |
) | |
# test replications elapsed relative user.self sys.self user.child sys.child | |
# method 2 100 1.51 1.208 1.14 0.37 NA NA | |
# method 1 100 1.99 1.592 1.59 0.39 NA NA | |
# method 0 100 1.25 1.000 1.16 0.10 NA NA | |
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