When I have a matrix MMM with long column names and short row names, then I
will normally display the transpose t(MMM).  It will be much easier to read.
I will also set the emacs window holding *R* to very wide (150 or so) and
then I can see
the whole width of the transposed matrix simultaneously.

Rich


On Thu, Apr 4, 2013 at 8:30 PM, Ross Boylan <ross@biostat.ucsf.edu> wrote:

> Over a decade ago there was a problem with model.frame when the variable
> names were long:
> https://stat.ethz.ch/**pipermail/r-help/2002-August/**024492.html<https://stat.ethz.ch/pipermail/r-help/2002-August/024492.html>
>
> I have similar symptoms with R 2.15.3 on Windows 7:
>
> Browse[2]> x <- model.matrix(formula(myform), p$data)
> Error in model.frame.default(object, data, xlev = xlev) (from mice.R#601) :
>   object is not a matrix
>
> My attempt at a work-around did not help:
> Browse[2]> x <- model.matrix(formula(myform), as.matrix(p$data))
> Error in model.frame.default(object, data, xlev = xlev) (from mice.R#601) :
>   'data' must be a data.frame, not a matrix or an array
> Browse[2]> formula(myform)
> ~educ_sg + ethnic_sg + hiv + J10 + A5 + mar_stat + orientation +
>     Born_US ~ educ_sg + ethnic_sg + hiv + J10 + A5 + mar_stat +
>     orientation + Born_US + (DWPAD_ActAvoid + DWPAD_EducConf +
>     DWPAD_PasAvoid + DWPAD_Support) * ethnic_sg * racGayDiscStress +
>     0
>
> Notice there are many three-way interactions, which certainly will produce
> long column names.
>
> There was a suggestion in the old thread to set width= in aov, for use by
> deparse, but I'm not using aov and there are no obvious hooks to deparse.
>  The level names are also long and include spaces, inequality signs, and
> periods (also "-" if it uses raw numeric values); perhaps that is the
> culprit.
>
> Any suggestions for how to diagnose or fix?  This is all happening inside
> a package that is for general use, and so require recoding of variable and
> level names to something brief is not very attractive. However, changing
> these within the program might be workable.
>
> Ross Boylan
>
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