2011/11/21 Romain François <rom...@r-enthusiasts.com>: > Hello, > > We've released the int64 package to CRAN a few days ago. The package > provides S4 classes "int64" and "uint64" that represent signed and unsigned > 64 bit integer vectors. > > One further development of the package is to facilitate reading 64 bit > integer data from csv, etc ... files. > > I have this function that wraps a call to read.csv to: > - read the "int64" and "uint64" columns as "character" > - converts them afterwards to the appropriate type >
Try this: > library(int64) > Lines <- "A\n12\n" > > setAs("character", "int64", function(from) as.int64(from)) > > DF <- read.csv(textConnection(Lines), colClasses = "int64") > > str(DF) 'data.frame': 1 obs. of 1 variable: $ A:Formal class 'int64' [package "int64"] with 2 slots .. ..@ .Data:List of 1 .. .. ..$ : int 0 12 .. ..@ NAMES: NULL To convince ourselves that its translating from character to int64: > setAs("character", "int64", function(from) {print(class(from)); > as.int64(from)}) > DF <- read.csv(textConnection(Lines), colClasses = "int64") [1] "character" -- Statistics & Software Consulting GKX Group, GKX Associates Inc. tel: 1-877-GKX-GROUP email: ggrothendieck at gmail.com ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel