writeaddr: Writing a value at some memory address

In LeLogicielR: Functions and datasets to accompany the book "Le logiciel R: Maitriser le langage, Effectuer des analyses statistiques" (French)

Description

Writing a value at some memory address

Usage

writeaddr(addr, newval, type = "integer",
size = 4, length = 1, out.of.bounds = FALSE)

Arguments

addr	Integer value. Address in memory.
newval	New value to write at this address.
type	type
size	size
length	length
out.of.bounds	TRUE or FALSE

Value

Nothing is returned.

Author(s)

Lafaye de Micheaux Pierre <[e-mail]>, Remy Drouilhet <[e-mail]>, Liquet Benoit <[e-mail]>

References

Chapter 9 (Managing Sessions) from the book: The R Software, Fundamentals of Programming and Statistical Analysis

Examples

## Not run: 
x <- c(8L,9L)
addr <- getaddr(x)$addr.int # Gets the address of the first
                            # box of the 64-box block where x
                            # is stored.
addr
writeaddr(addr,6L) # Write the integer 6 at this address.
x
writeaddr(addr+4L,7L) # An integer is coded over 4 bytes,
                      # hence increment the address by 4 to
                      # get to x[2].
x
x <- c(12.8,4.5)
x
addr <- getaddr(x)$addr.int # Get the address of the first box
                            # of the 128-box block where x is
                            # stored.
writeaddr(addr,6.2)
x
writeaddr(addr+8L,7.1) # A double is coded over 8 bytes.
x

## End(Not run)

LeLogicielR documentation built on May 1, 2019, 9:10 p.m.