Preserving large numbers

Question

I am trying to read a CSV file that has barcodes in the first column, but when R gets it into a data.frame, it converts 1665535004661 to 1.67E+12.<

Answer 1

From the ?is.integer page:

"Note that current implementations of R use 32-bit integers for integer vectors, so the range of representable integers is restricted to about +/-2*10^9?

1665535004661L > 2*10^9 [1] TRUE

You want package Rmpfr.

library(Rmpfr)
x <- mpfr(15, precBits= 1024)