Hi,

I'm developing the PKNCA package, and I've got an odd difference between warning behavior on different operating systems that I can't figure out.

When I run the following code on Windows 10 (with R 3.3.0), I get the following warning:

library(PKNCA)
source("https://raw.githubusercontent.com/billdenney/pknca/master/tests/testthat/generate.data.R";)
tmpconc <- generate.conc(2, 1, 0:24)
tmpconc$conc <- 0
tmpdose <- generate.dose(tmpconc)
myconc <- PKNCAconc(tmpconc, conc~time|treatment+ID)
mydose <- PKNCAdose(tmpdose, dose~time|treatment+ID)
mydata <- PKNCAdata(myconc, mydose)
myresult <- pk.nca(mydata)

Warning messages:
1: In pk.calc.half.life(conc = c(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  :
Too few points for half-life calculation (min.hl.points=3 with only 0 points)
2: In pk.calc.half.life(conc = c(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  :
Too few points for half-life calculation (min.hl.points=3 with only 0 points)

When I run the code on Linux (Ubuntu 16.04 with R 3.3.1), I do not get a warning. When I run the code on Linux after "options(warn=1)", I get the warning. I have confirmed that the same code path is taken in both Windows and Linux by simply inserting a print statement next to the warning. The actual warning code is:

    warning(sprintf(
"Too few points for half-life calculation (min.hl.points=%g with only %g points)",
      min.hl.points, nrow(dfK)))

This platform inconsistency is causing issues with my package because the package expects the warnings, and the user should know about the warnings. I've got test cases expecting the warnings, and they fail everywhere but Windows (https://cran.r-project.org/web/checks/check_results_PKNCA.html).

Does anyone have an idea why warnings may behave differently on Windows compared to non-Windows platforms? Is this a bug in R somewhere? (I've not been able to make a simpler example that triggers the issue, unfortunately.)

Thanks,

Bill

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