On 08-Oct-03 Liaw, Andy wrote: >> From: Andrej Kveder [mailto:[EMAIL PROTECTED] >> I have two questions: >> (1) >> Is there a way in R to change the base-n of the calculations. >> I wnat to run some calculations either in binary (base-2) or >> base-4. Is there a way to specify that in R - to chnage from >> the decimal? > > I don't have any good answers, but just this: Arithmetics in any base > is the same. I believe you just need a way to convert decimal to other > bases and printed out as such. E.g., 1 + 5 = 6 = 110 in binary. You > just need something that returns 110 when given 6. Personally I'd > write such a thing in C because I don't know any better.
Indeed! A pity that R's sprintf (though described as a wrapper for C's sprintf) does not accept the C format conversion specifiers "%X" (for hexadecimal) or, better stil, "%o" (for octal), because then Andy's strsplit usage below could give you one of 16 or 8 characters which could be used to index a lookup of a bit pattern! Ted. > Would the following do what you want? > >> a <- c(1234, 5678, 90) >> foo <- function(x) strsplit(as.character(x), "") >> foo(a) > [[1]] > [1] "1" "2" "3" "4" > > [[2]] > [1] "5" "6" "7" "8" > > [[3]] > [1] "9" "0" -------------------------------------------------------------------- E-Mail: (Ted Harding) <[EMAIL PROTECTED]> Fax-to-email: +44 (0)870 167 1972 Date: 09-Oct-03 Time: 00:09:16 ------------------------------ XFMail ------------------------------ ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
