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## ----echo = FALSE, results = "hide", message = FALSE--------------------------
knitr::opts_chunk$set(collapse = TRUE, comment = "#>")
library(bit)
.ff.is.available = requireNamespace("ff", quietly=TRUE) && packageVersion("ff") >= "4.0.0"
if (.ff.is.available) library(ff)
#tools::buildVignette("vignettes/bit-demo.Rmd")
#devtools::build_vignettes()
## -----------------------------------------------------------------------------
n <- 1e8
b1 <- bit(n)
b1
## -----------------------------------------------------------------------------
object.size(b1) / n
## -----------------------------------------------------------------------------
b1[10:30] <- TRUE
summary(b1)
## -----------------------------------------------------------------------------
b2 <- bit(n)
b2[20:40] <- TRUE
b2
## -----------------------------------------------------------------------------
b1 & b2
## -----------------------------------------------------------------------------
summary(b1 & b2)
## -----------------------------------------------------------------------------
w1 <- as.bitwhich(b1)
w2 <- as.bitwhich(b2)
object.size(w1) / n
## -----------------------------------------------------------------------------
w1 & w2
## -----------------------------------------------------------------------------
summary(w1 & w2)
## -----------------------------------------------------------------------------
summary(b1 & w2)
## -----------------------------------------------------------------------------
summary(b1, range=c(1, 1000))
## -----------------------------------------------------------------------------
as.which(b1, range=c(1, 1000))
## -----------------------------------------------------------------------------
lapply(chunk(from=1, to=n, length=10), function(i) as.which(b1, range=i))
## ----eval=.ff.is.available----------------------------------------------------
# options(ffbatchbytes=1024^3)
# x <- ff(vmode="single", length=n)
# x[1:1000] <- runif(1000)
# lapply(chunk(x, length.out = 10), function(i) sum(x[as.hi(b1, range=i)]))
## ----eval=.ff.is.available----------------------------------------------------
# delete(x)
# rm(x, b1, b2, w1, w2, n)
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