Thank you for the report -- but a bit more investigation of the root
cause would have been even more helpful: this is not 'model.frame
error', nor even reported by R as such.
The issue was that complete.cases() did not know how to find the
number of rows of a 0-column data frame (it knew nothing about data
frames). That has been changed in R-patched and R-devel, together with
a more informative error message in other cases where the number of
rows is unspecified.
On Sun, 15 Nov 2009, sebastian.wastl.me...@campus.lmu.de wrote:
Full_Name: Sebastian Meyer
Version: 2.10.0
OS: x86_64-pc-linux-gnu
Submission from: (NULL) (77.135.124.96)
When using model.frame (model.frame.default) on an intercept-only model and with
na.action=na.fail SPECIFIED, i.e.
data(iris)
That line is unnecessary: 'iris' is a visible object in package
'datasets'.
model.frame( ~ 1, data = iris, na.action = na.fail)
one gets the following error:
Error in complete.cases(object) : negative length vectors are not allowed
There is no error if the na.action argument is left UNSPECIFIED (though the
default value also is na.fail!):
model.frame( ~ 1, data = iris)
In either case, there should be no error. Specifing other na.action functions
(na.omit, na.pass, na.exclude) works.
If there is at least one (non-intercept) variable in the formula, e.g.
model.frame( ~ 1 + Species, data = iris, na.action = na.fail)
there is obviously no issue.
Best regards,
Sebastian Meyer
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Brian D. Ripley, rip...@stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
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