[Moving this thread to R-devel instead] I suspect your "random" results are due to a bug in gsub(). On my R v1.9.0 (Rterm and Rgui) R crashes when I do
% R --vanilla > gsub(" ", "", "abb + c | a*b", perl=TRUE) Trying > gsub(" ", "", "b c + d | a * b", perl=TRUE) and I'll get NULL. With > gsub("\\s", "", "bc + d | a * b", perl=TRUE) it works as expected. So there is something buggy for sure. This might have been fixed in R v1.9.1 or its patched version. (I'm still busy to recover from a HDD crash, but, yes, I will update to Rv1.9.1. BTW, what's the name of the error logger for Windows that is once in a while recommended on this list and that gives more detailed errors than the default Windows one?) Cheers Henrik > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of hadley wickham > Sent: Friday, July 16, 2004 10:50 PM > To: [EMAIL PROTECTED] > Subject: [R] Strange (non-deterministic) problem with strsplit > > > I'm having an odd problem with strsplit (well I think it's > strplit that's causing the problem). When I run the code > below as follows: str(parseFormulaMin(y +x +d ~ b +d +e| a * b)) > > I expect to get > List of 3 > $ y: chr "y+x+d" > $ x: chr "b+d+e" > $ g: chr "a*b" > > But about half the time I get > > List of 3 > $ y: chr "y+x+d" > $ x: chr "b+d+e" > $ g: chr "a*[square box]" > (square box not reproduced here because copy and pasting it > seems to break my web mail) > > Can anyone reproduce the problem and/or suggest any solutions? > > parseFormula <- function(formula) { > splitvars <- function(x) { > strsplit(x, "\\+|\\*")[[1]] > } > stripwhitespace <- function(x) { > gsub("\\s", "", x, perl=T) > } > > vars <- stripwhitespace(as.character(formula)[3]) > varsplit <- strsplit(vars, "|", fixed=TRUE)[[1]] > > parts <- list( > y = stripwhitespace(as.character(formula)[2]), > x = varsplit[1], > g = varsplit[2] > ) > lapply(parts, splitvars) > } > > Thanks, > > Hadley > > ______________________________________________ > [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 > > ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-devel