Greetings to r-help land.
I've run into some program crashes and I've traced them back to methods()
behavior
after the package gdata is loaded. I provide now a minimal re-producible
example. This seems bugish to me. How about you?
dat <- data.frame(x = rnorm(100), y = rnorm(100))
lm1 <- lm(y ~ x, data = dat)
methods(class = "lm")
## OK so far
library(gdata)
methods(class = "lm")
## epic fail
## OUTPUT.
> dat <- data.frame(x = rnorm(100), y = rnorm(100))
> lm1 <- lm(y ~ x, data = dat)
>
> methods(class = "lm")
[1] add1.lm* alias.lm* anova.lm case.names.lm*
[5] confint.lm* cooks.distance.lm* deviance.lm* dfbeta.lm*
[9] dfbetas.lm* drop1.lm* dummy.coef.lm* effects.lm*
[13] extractAIC.lm* family.lm* formula.lm* hatvalues.lm
[17] influence.lm* kappa.lm labels.lm* logLik.lm*
[21] model.frame.lm model.matrix.lm nobs.lm* plot.lm
[25] predict.lm print.lm proj.lm* qr.lm*
[29] residuals.lm rstandard.lm rstudent.lm simulate.lm*
[33] summary.lm variable.names.lm* vcov.lm*
Non-visible functions are asterisked
>
> library(gdata)
gdata: read.xls support for 'XLS' (Excel 97-2004) files ENABLED.
gdata: read.xls support for 'XLSX' (Excel 2007+) files ENABLED.
Attaching package: gdata
The following object is masked from package:stats:
nobs
The following object is masked from package:utils:
object.size
> methods(class = "lm")
Error in data.frame(visible = rep.int(FALSE, n2), from = rep.int(msg, :
duplicate row.names: nobs.lm
> sessionInfo()
R version 3.0.0 (2013-04-03)
Platform: x86_64-pc-linux-gnu (64-bit)
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8
[7] LC_PAPER=C LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] gdata_2.12.0.2
loaded via a namespace (and not attached):
[1] gtools_2.7.1 tcltk_3.0.0 tools_3.0.0
gdata is one of my favorite packages, its worth the effort to get to the
bottom of this.
--
Paul E. Johnson
Professor, Political Science Assoc. Director
1541 Lilac Lane, Room 504 Center for Research Methods
University of Kansas University of Kansas
http://pj.freefaculty.org http://quant.ku.edu
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