[R] nScree

[atramon]

I'm trying to determine the number of factors to extract for a factor
analysis, but am having trouble with the nS/nScree function.  I did this
successfully earlier today but with the wrong matrix/dataframe, and for some
reason it won't work with the corrected one even though I've entered the
same call.

attmott is the matrix:

attmott<-read.table(file.choose(), header=F, sep=",",)
> attmott<-as.matrix(attmott)
> dim(attmott)
[1] 18 41
> ev<-eigen(cor(attmott))
> ap<-parallel(subject=ncol(attmott), var=nrow(attmott), rep=100, cent=.05)
> nS<-nScree(x=ev$values, aparallel=ap$eigen$qevpea)
Error in while ((cond1 == TRUE) && (cond2 == TRUE) && (i < nk)) { : 
  missing value where TRUE/FALSE needed


I'm not sure what this error message means...  I tried entering
nS<-nScree(x=ev$values, cor=TRUE, aparallel=ap$eigen$qevpea) but that did
not help, nor did replacing all the 0's with NA.


Any help would be greatly appreciated!



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