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aaronwolen/matrix-benchmark.md

Created July 2, 2015 16:25
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Benchmark for converting matrixes to tidy data.frames in R
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matrix-benchmark.md

library(microbenchmark)

set.seed(1024) nr <- 1e4 nc <- 100

m <- matrix(runif(nr * nc), nrow = nr, dimnames = list(paste0("g", seq_len(nr)), paste0("s", seq_len(nc))))

microbenchmark( m1 = as.data.frame.table(m),

m2 = as.data.frame.table(m, stringsAsFactors = FALSE),

m3 = data.frame(col = rep(colnames(m), each = nrow(m)), row = rep(rownames(m), ncol(m)), value = as.vector(m)),

m4 = data.frame(col = rep(colnames(m), each = nrow(m)), row = rep(rownames(m), ncol(m)), value = as.vector(m), stringsAsFactors = FALSE) )

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