(PR#14066) model.frame error with formula=~1 and na.action=na.fail
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.Meyer at 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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