Nothing
## ----echo=FALSE, message=FALSE------------------------------------------------
library("rco")
library("microbenchmark")
library("ggplot2")
autoplot.microbenchmark <- function(obj) {
levels(obj$expr) <- paste0("Expr_", seq_along(levels(obj$expr)))
microbenchmark:::autoplot.microbenchmark(obj)
}
speed_up <- function(obj) {
levels(obj$expr) <- paste0("Expr_", seq_along(levels(obj$expr)))
obj <- as.data.frame(obj)
summaries <- do.call(rbind, by(obj$time, obj$expr, summary))
res <- c()
for (i in seq_len(nrow(summaries) - 1) + 1) {
res <- rbind(res, summaries[1, ] / summaries[i, ])
}
rownames(res) <- levels(obj$expr)[-1]
return(res)
}
## ----eval=FALSE---------------------------------------------------------------
# i <- 0
# n <- 1000
# y <- rnorm(1)
# z <- rnorm(1)
# a <- c()
# while (i < n) {
# x <- y + z
# a[i] <- 6 * i + x * x
# i <- i + 1
# }
## -----------------------------------------------------------------------------
code <- paste(
"i <- 0",
"n <- 1000",
"y <- rnorm(1)",
"z <- rnorm(1)",
"a <- c()",
"while (i < n) {",
" x <- y + z",
" a[i] <- 6 * i + x * x",
" i <- i + 1",
"}",
sep = "\n"
)
cat(code)
## -----------------------------------------------------------------------------
opt_code <- opt_loop_invariant(list(code))
cat(opt_code$codes[[1]])
## ----message=FALSE------------------------------------------------------------
bmark_res <- microbenchmark({
eval(parse(text = code))
}, {
eval(parse(text = opt_code))
})
autoplot(bmark_res)
speed_up(bmark_res)
## ----eval=FALSE---------------------------------------------------------------
# while (i < n) {
# if (n > 3) {
# something_without_i
# }
# }
## ----eval=FALSE---------------------------------------------------------------
# if (i < n) {
# if (n > 3) {
# something_without_i
# }
# }
# while (i < n) {
# }
## ----eval=FALSE---------------------------------------------------------------
# while (i < n) {
# i <- (x * y) + 1
# }
## ----eval=FALSE---------------------------------------------------------------
# is_1 <- (x * y)
# while (i < n) {
# i <- is_1 + 1
# }
## ----eval=FALSE---------------------------------------------------------------
# y <- 1
# repeat{
# if (y > 4) {
# break
# }
# x <- 8 * 8
# y <- y + 1
# }
## ----eval=FALSE---------------------------------------------------------------
# y <- 1
# if (y <= 4) {
# x <- 8 * 8
# }
# repeat{
# if (y > 4) {
# break
# }
# y <- y + 1
# }
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