On 12/09/2013 9:38 AM, Michael Friendly wrote:
I received the following email note re: the vcdExtra package
> A vcd update has shown that packages TIMP and vcdExtra are not
> declaring their dependence on colorspace/MASS: see
>
> http://cran.r-project.org/web/checks/check_results_vcdExtra.html
But, I can't see what to do to avoid this, nor understand what has
changed in R devel.
Sure enough, CRAN now reports errors in examples using MASS::loglm(),
using R Under development (unstable) (2013-09-11 r63906)
> Caesar.mod0 <- loglm(~Infection + (Risk*Antibiotics*Planned),
data=Caesar)
Error: could not find function "loglm"
I think this one would be fine if you had library(MASS) or require(MASS)
or (probably best) used MASS::loglm explicitly. It may be that in the
past some other package put MASS on the search list, and that's why it
worked before.
The distinction is between "loading" and "attaching" a package. Loading
it (which would be done if you had MASS::loglm, or imported it)
guarantees that the package is initialized and in memory, but doesn't
make it visible to the user without the explicit MASS:: prefix.
Attaching it first loads it, then modifies the user's search list so the
user can see it.
Loading is less intrusive, so it's preferred over attaching. Both
library() and require() would attach it.
Duncan Murdoch
In DESCRIPTION I have
Depends: R (>= 2.10), vcd, gnm (>= 1.0.3)
Suggests:
ca,gmodels,Fahrmeir,effects,VGAM,plyr,rgl,lmtest,MASS,nnet,ggplot2,Sleuth2,car
and the vcd DESCRIPTION has
Depends: R (>= 2.4.0), grid, stats
Suggests: KernSmooth, mvtnorm, kernlab, HSAUR, coin
Imports: utils, MASS, grDevices, colorspace
so, in an R 3.0.0 console, library(vcdExtra) loads vcd and its dependencies:
> library(vcdExtra)
Loading required package: vcd
Loading required package: MASS
Loading required package: grid
Loading required package: colorspace
Loading required package: gnm
Warning messages:
1: package ‘vcd’ was built under R version 3.0.1
2: package ‘MASS’ was built under R version 3.0.1
>
Note: these CRAN errors do not occur on R-Forge, using R version 3.0.1
Patched (2013-08-21 r63645)
and the latest devel version (0.5-11) of vcdExtra.
-Michael
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