Hi I have a list of vectors, each one of which should be a subset of the previous one. How do I check that this property actually holds?
Toy problem follows with a list of length 4 but my list can be any length subsets <- list( l1 = 1:10 , l2 = seq(from=1,to=9,by=2), l3 = c(3,7), l4 = 3 ) I need all(subsets[[4]] %in% subsets[[3]]) & all(subsets[[3]] %in% subsets[[2]]) & all(subsets[[2]] %in% subsets[[1]]) I can write a little function to do this: check.for.inclusion <- function(subsets){ out <- rep(FALSE,length(subsets)-1) for(i in 1:(length(subsets)-1)){ out[i] <- all(subsets[[i+1]] %in% subsets[[i]]) } return(all(out)) } how to do it elegantly and/or quickly? -- Robin Hankin Uncertainty Analyst National Oceanography Centre, Southampton European Way, Southampton SO14 3ZH, UK tel 023-8059-7743 ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html