Description
Vector Bitwise Operations.
Description
A tool for fast, efficient bitwise operations along the elements within a vector. Provides such functionality for AND, OR and XOR, as well as infix operators for all of the binary bitwise operations.
README.md
vectorbitops
A set of minimal extensions to R's built-in bitwise operations, mainly for use with bitmasks.
This provides C functions to AND, OR or XOR a vector of integers together, to compress down to a single int. It also provides infix operators for bitwise operations, using the base functions.
If using bitops, the infix operators are redundant.
Installation
You can install the development version of vectorbitops like so:
devtools::install_gitlab("S_S_/vectorbitops")
Example
This is a basic example of use for some simple bitmasking.
library(vectorbitops)
vals <- c(
"foo" = 1 %<<% 0,
"bar" = 1 %<<% 1,
"baz" = 1 %<<% 2
)
mask_a <- vals["foo"]
mask_b <- vals["baz"]
mask_c <- bit_vector_OR(vals[c("bar", "baz")])
flags <- bit_vector_OR(vals[c("foo", "bar")])
# In practise, one would just use `bitwAnd` for the below, but for demostration purposes:
bit_vector_AND(c(flags, mask_a)) # 1
bit_vector_AND(c(flags, mask_b)) # 0
bit_vector_AND(c(flags, mask_c)) # 2