> Double allows me to > store large numbers but I can not perform bitwise shifting.
It is a nuisance that bitwShiftL and bitwShitR don't just shift (and wrap around to negative) for integers so you could use all 32 bits. You could use doubles and multiply (*) and divide (%/%) by 2^n instead of shifting left and right by n bits. That would give you 52 bits. Bitwise 'and' and 'or' with doubles is harder to do efficiently at the R level but you can get it done with the following: shiftL <- function(x, n) x * 2^n shiftR <- function(x, n) x %/% 2^n or <- function(x, y) .bitOp(x, y, bitwOr) and <- function(x, y) .bitOp(x, y, bitwAnd) bitSlice <- function(x, from, length) shiftR(x, from) %% 2^(from+length) .bitOp <- function(x, y, bitwOp) bitwOp(bitSlice(x, 0, 26),bitSlice(y, 0, 26)) + shiftL(bitwOp(bitSlice(x, 26, 26), bitSlice(y, 26, 26)), 26) Bill Dunlap TIBCO Software wdunlap tibco.com On Thu, Jun 5, 2014 at 11:43 AM, Koustubh Bagade <kou.geni...@gmail.com> wrote: > Hi > > I am working on numbers between 0 - 2^32. I want to perform bit-wise shift > operations on these numbers. Integer allows me to do bitwise shift > operations but number range is limited to 0 - 2^31. Double allows me to > store large numbers but I can not perform bitwise shifting. > > I can not change programming language as it is part of larger project. > > Is there a way to solve this problem? Perhaps using data types similar to > unsigned integer or long integer? > > Thanks > > Koustubh Bagade > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
