Error in apply(x2, 1, diff) : dim(X) must have a positive length
What package is the bootstrap() function from? There are many functions by that name.... My hunch is that it takes a vector at a time and puts it through dif.mns so that leads to the error in the apply() call but I can't verify. Michael
On Mon, Feb 13, 2012 at 10:34 AM, hithit168 <ccchristy at live.com> wrote:
Thank you for your help, David. I was trying to run bootrapping on the dataset "shoes" from MASS package. But I still have some problem here.
as.matrix(data.frame(shoes),nrows=10,ncols=2,byrow=T)
A B [1,] 13.2 14.0 [2,] 8.2 8.8 [3,] 10.9 11.2 [4,] 14.3 14.2 [5,] 10.7 11.8 [6,] 6.6 6.4 [7,] 9.5 9.8 [8,] 10.8 11.3 [9,] 8.8 9.3 [10,] 13.3 13.6
y=as.matrix(data.frame(shoes),nrows=10,ncols=2,byrow=T) class(y)
[1] "matrix"
apply(y,1,diff)
[1] 0.8 0.6 0.3 -0.1 1.1 -0.2 0.3 0.5 0.5 0.3
dif.mns <- function(x2,tr1=.1,tr2=.2){
+ diffs=apply(x2,1,diff) + mn1=mean(diffs) + mn2=mean(diffs,tr=.1) + mn3=mean(diffs,tr=.2) + mn4=median(diffs) + mns=c(mn1,mn2,mn3,mn4) + list(mnds=round(mns,3))}
dif.mns(y,tr1=.1,tr2=.2)
$mnds [1] 0.410 0.400 0.417 0.400
bootstrap(y,nboot=1000,theta=dif.mns)
Error in apply(x2, 1, diff) : dim(X) must have a positive length I am not sure what I am doing wrong. When I run apply(y,1,diff) I am able to get output, and when I run dif.mns with just the original dataset, I am also able to get output. -- View this message in context: http://r.789695.n4.nabble.com/Error-in-apply-x2-1-diff-dim-X-must-have-a-positive-length-tp4382435p4384129.html Sent from the R help mailing list archive at Nabble.com.
______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.