TRSbook (version 1.0.2)

writeaddr: Writing a value at some memory address

Description

Writing a value at some memory address

Usage

writeaddr(addr,newval)

Arguments

addr

Integer value. Address in memory.

newval

New value to write at this address.

Value

Nothing is returned.

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
# }