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Dear R-helpers, How come that in the following code the rnorm() function is evaluated only once for each branch of the 'ifelse' ? x <- rnorm(10) y1 <- ifelse(x > 0, rnorm(1) , rnorm(1)) What is the right way to...

Dear R-helpers, How come that in the following code the rnorm() function is evaluated only once for each branch of the 'ifelse' ? x <- rnorm(10) y1 <- ifelse(x > 0, rnorm(1) , rnorm(1)) What is the right way to...

Hi, I would like to feed Sweave with an UTF8 encoded file, and obtain an UTF8 TeX file (so that I can use XeTeX and its font handling facilities). I'm under Win XP. I guess this is a matter...

What is puzzling me is that rnorm(1) is only evaluated *twice*, one time for each branch, with only 2 different random deviates, instead of giving ten different random deviates. y1 has indeed 10 values but with only 2 different...

Dear All, I'm modelling some longitudinal data (1 continuous response variable measured at 6 times (covariate time taken as factor), 1 continuous baseline, one "treatment" variable also taken as a factor) collected in the same subjects using the following...

Hi all, I can't fathom why the accented "?" in the following ggplot2 graph makes R hangs when using tikzdevice,? whereas it works using simple pdf device. ###### library(tikzDevice) library(ggplot2) options(tikzDefaultEngine = "luatex") tikzLualatexPackages =c( ? "\\usepackage{tikz}\n", ? "\\usepackage...

Dear R-users I'm modelling some longitudinal data (1 response variable measured at 6 occasions, 1 baseline, one "treatment" variable) collected in the same subjects using the following model: library(nlme) model.lme <- lme(response ~ V0+ time+ tt + tt...

> But you got only two (eventually one) distinct values, right? Look at > the code for 'ifelse': yes and no are only called once each, then > recycled to desired length. > > I guess you want something like > > x <- rnorm(10) > y <- rnorm...

...ifelse, a function of three **vector** arguments.... Yes !! I misunderstood the functioning of ifelse. Thanks Jacques. Peter Dalgaard wrote: > jropers at freesurf.fr wrote: >> What is puzzling me is that rnorm(1) is only evaluated *twice*, one >> time for each...