CODEWITHSUNDEEP
rtype-conversionint64
kgibm
kgibm

Reputation: 1038

How do I convert 64-bit hexadecimal strings in R?

How do I convert 64-bit hexadecimal strings in R?

> library(int64)
> as.int64("7f2d36a2a000")
[1] NA
Warning message:
In as.int64("7f2d36a2a000") : NAs introduced
> as.int64("0x7f2d36a2a000")
[1] NA
Warning message:
In as.int64("0x7f2d36a2a000") : NAs introduced

Upvotes: 4

Views: 5116

Answers (2)

jlhoward
jlhoward

Reputation: 59355

Here's a way using bit64.

library(bit64)
str <- "7f2d36a2a000"
as.integer64(as.numeric(paste0("0x",str)))
# integer64
[1] 139832166883328

Upvotes: 7

Josh O&#39;Brien
Josh O&#39;Brien

Reputation: 162321

For a number that large, you'll need to load a package that supports representations of arbitrarily large numbers. Rmpfr is one example:

library(Rmpfr)

## Check that it works as expected on smaller numbers:
strtoi("ff", base=16)
# [1] 255
mpfr("ff", base=16)
# 1 'mpfr' number of precision  8   bits 
# [1] 255
as.integer(mpfr("ff", base=16)
# [1] 255

## Then apply it with (more) confidence to larger numbers: 
mpfr("7f2d36a2a000", base=16)
# 1 'mpfr' number of precision  48   bits 
# [1] 139832166883328
mpfr("7f2d36a2a0007f2d36a2a0007f2d36a2a0007f2d36a2a000", base=16)
# 1 'mpfr' number of precision  192   bits 
# [1] 3118361524223520784583964884878580812558070356334996529152

Upvotes: 9

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