On Tue, 2007-01-23 at 07:41 -0800, Spencer Graves wrote: > Consider the following: > > plot(0, 0, xlim=c(-10, 10), ylim=c(-50, 50)) > lines(c(0,0), (2*c(-pi, pi))^2) > > I see no line in this plot. > > R version 2.4.1 (2006-12-18) > i386-pc-mingw32 > > locale: > LC_COLLATE=English_United States.1252;LC_CTYPE=English_United > States.1252;LC_MONETARY=English_United > States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252 > > attached base packages: > [1] "stats" "graphics" "grDevices" "utils" "datasets" "methods" > [7] "base" > > My work around is the following: > > pi2.2 <- (2*pi)^2 > lines(c(0, 0), c(-pi2.2, pi2.2)) > > Why won't "lines(c(0,0), (2*c(-pi, pi))^2)" work for me? > Thanks, > Spencer Graves
In the first case, you are squaring 2*pi and 2*-pi, both resulting in the same positive number: > (2*c(-pi, pi))^2 [1] 39.47842 39.47842 You are going from (0,39.47842) to (0,39.47842), hence no line. HTH, Marc Schwartz ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
