long formulas in terms() (PR#873)

Full_Name: Jerome Asselin
Version: 1.2.2
OS: Windows 95
Submission from: (NULL) (142.52.81.1)



I need to use the "terms()" function to decompose a formula.
The function seems to work for small formulas, but not for long formulas.

<snip>

I noticed that when the left-hand side term of the formula is
too large to be written on one line, an error occurs in terms().
However, increasing the line width by "options(width=200)" did
not solve the problem.

The problem is in fixFormulaObject in terms.formula(). It uses deparse()
on the lhs of the formula.

A work-around is to change the line near the top of fixFormulaObject in
terms.formula from
	else deparse(form[[2]])
 to
	else deparse(form[[2]],width.cutoff=200)

but this may not be the final solution -- we should have something without
a width limit

	-thomas

Thomas Lumley			Asst. Professor, Biostatistics
tlumley@u.washington.edu	University of Washington, Seattle

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