如何在R中轉換64位十六進制字符串？

Question

如何在R中轉換64位十六進制字符串？

> 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

Answer 1

這是使用bit64的一種方式。

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

Answer 2

對於數字很大的數字，您需要加載一個支持任意大數字表示的包。 Rmpfr就是一個例子：

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