Hello, I have some C code that I'm interfacing to R using the .C calling interface. Currently the C code uses the rand() function from the GNU C library to generate random numbers. Since I need the random numbers in a range from 0 to a (where a is an integer) I use the RAND_MAX macro as
(int)(rand() * (float)(*nobs-1) / (RAND_MAX+1.0)) (taken from the rand() manpage) However, since I have access to the R RNG's I'd like to use them. Firstly, would it be an improvement to use the R RNG over that supplied by the C library? Secondly, I dont see any mention of an equivilant to RAND_MAX in the documentation of runif() (as I want to use unif_rand() in my C code). Is it valid to use the C libraries' RAND_MAX as the maximum value of the RNG or am I missing something? As far as I understand using the .C interface I can't call R functions from my C code (which means I cant access runif()) - is this correct? As I would rather stay with the .C interface rather than the .Call interface is there a way to get random numbers within a given range? Thanks, ------------------------------------------------------------------- Rajarshi Guha <[EMAIL PROTECTED]> <http://jijo.cjb.net> GPG Fingerprint: 0CCA 8EE2 2EEB 25E2 AB04 06F7 1BB9 E634 9B87 56EE ------------------------------------------------------------------- All laws are simulations of reality. -- John C. Lilly ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
