Nothing
addxtabs<-function(x) {
if(!is.list(x) || class(x[[1]]) != "xtab")
stop("addxtabs adds a list of xtab results with equal numbers of columns")
allrownames<-unlist(lapply(lapply(x,"[[","counts"),rownames))
rowlabels<-sort(unique(allrownames))
allcolnames<-unlist(lapply(lapply(x,"[[","counts"),colnames))
collabels<-sort(unique(allcolnames))
dimx1<-dim(x[[1]]$counts)
outmat<-matrix(0,nrow=length(rowlabels),ncol=dimx1[2])
for(xt in 1:length(x)) {
currowlab<-rownames(x[[xt]]$counts)
for(row in 1:length(currowlab)) {
curcollab<-colnames(x[[xt]]$counts)
whichrow<-rowlabels%in%currowlab[row]
for(column in 1:length(curcollab)) {
whichcol<-collabels%in%curcollab[column]
outmat[whichrow,whichcol]<-
outmat[whichrow,whichcol]+x[[xt]]$counts[row,column]
}
}
}
rownames(outmat)<-rowlabels
colnames(outmat)<-collabels
return(outmat)
}
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