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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