[R] Area() artefacts?? Hello, everybody I run the following program, and depending on the size of eps I get different results. With eps=1e-05, the program calculates wrong values for x=65:67 and others. The program runs fine with eps=1e-07. Why is this so? Also, I am using area() instead of integrate() because I cannot make integrate to work, especially with imaginary numbers. Maybe someone can show me how to use integrate in this particular code? THanks in advance! #Computes the p.m.f. via (10.53) of the number of i.i.d. Ber(p) trials #required until m consecutive successes occur. #Requires MASS package #==========================================================# consecpmf <- function(xvec, m, p, eps=1e-05){ library(MASS) f<-numeric() for(j in seq(xvec)){ 	x <- xvec[j] 	f[j] <- area(fun, -pi, pi, limit=1000, eps=eps, x, m, p) } f<-Re(f) round(f,4) } fun <- function(t,x,m,p){ I <- exp(-1i*t*x)*cf(t,m,p)/(2*pi) I } cf <- function(t,m,p){ q <- 1-p if(m==1) {g <- p*exp(1i*t)/(1-q*exp(1i*t))} else {kk <- exp(1i*t)*cf(t, m-1, p); g <- (p*kk)/(1-q*kk)} g } #===================TESTING================================# consecpmf(seq(0,200),3,0.5) ______________________________________________ R-help@stat.math.ethz.ch 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.