On 12-02-28 2:11 PM, Chris Hane wrote:
Hello,
I am trying to "paste" together a formula to use in the mob function of
party. This means the formula will be of the form y ~ x1+ ...+xM | z1+..zN.
I am doing some preliminary fits of y ~ x1+ ...+xM, then want to add the
conditional part of the equation using update().
Here's the test code:
var1<- 1:78
x1<- paste("x", var1, sep="")
f1<- paste("f", var1[1:10], sep="")
# use first 77 variables
fmla<- as.formula( paste("y ~ ", paste(x1[1:77], collapse=" + ", sep=""),
sep=""))
fmla2<- update(fmla, paste(". ~ . | ", paste(f1, collapse= " + "), sep=""))
# CHANGE x to all 78 variables
fmla<- as.formula( paste("y ~ ", paste(x1, collapse=" + ", sep=""),
sep=""))
fmla2<- update(fmla, paste(". ~ . | ", paste(f1, collapse= " + "), sep=""))
I have run this in Windows and Linux (64 bit) and both fail when using all
78 terms (and anything more than 78 terms). The error message contains
Error in parse(text = x) : :1:514: unexpected ')'.
Changing the length of the names of the x variables will break the update()
with fewer variables, but always with an error referring to just more than
512 characters. There is nothing special about 77 or 78 variables here; I
want to do this with hundreds of variables.
Is there a workaround to this?
I've just committed code to R-devel (to become 2.15.0 at the end of the
month) to remove the truncation. I don't know any workaround that will
address this in earlier versions, other than "don't use very long formulas".
It also affects as.character() applied to a formula object, and some
other cases where very long language objects are displayed.
Please test R-devel or one of the alpha/beta versions once they are
built; this fix went into revision 58544.
Duncan Murdoch
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and provide commented, minimal, self-contained, reproducible code.
