On 28/02/2012 2:46 PM, Bert Gunter wrote:
Your code seems to be screwed up. There are no (small) size
limitations on formulas (afaik).
The following worked fine for me:
x<- paste("x",1:100,sep="",collapse = " + ")
part1<- paste("y",x,sep=" ~ ")
part2<- paste("f",1:50, sep="",collapse = " + ")
fml<- formula(paste(part1,part2,sep=" | "))
I think the problem is in R, not in what Chris did. It seems to be in
update.formula, or terms.formula, or some related function.
I'll try to track it down.
Duncan
Cheers,
Bert
On Tue, Feb 28, 2012 at 11:11 AM, Chris Hane
<christopher.a.h...@gmail.com> 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?
>
> [[alternative HTML version deleted]]
>
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