Dear all, How can I obtain the union of a list of logical values? Consider the following: x <- head(iris) x[,c(2,4)] <- NA x[c(2,4),] <- NA # > x # Sepal.Length Sepal.Width Petal.Length Petal.Width Species # 1 5.1 NA 1.4 NA setosa # 2 NA NA NA NA <NA> # 3 4.7 NA 1.3 NA setosa # 4 NA NA NA NA <NA> # 5 5.0 NA 1.4 NA setosa # 6 5.4 NA 1.7 NA setosa z <- data.frame(!is.na(x)) # > z # Sepal.Length Sepal.Width Petal.Length Petal.Width Species # 1 TRUE FALSE TRUE FALSE TRUE # 2 FALSE FALSE FALSE FALSE FALSE # 3 TRUE FALSE TRUE FALSE TRUE # 4 FALSE FALSE FALSE FALSE FALSE # 5 TRUE FALSE TRUE FALSE TRUE # 6 TRUE FALSE TRUE FALSE TRUE
I did find a solution, but it seems more like a hack: > ##union of logical values by rows (union of list of logical values) > as.logical(rowSums(z)) [1] TRUE FALSE TRUE FALSE TRUE TRUE > ##union of logical values by columns > as.logical(colSums(z)) [1] TRUE FALSE TRUE FALSE TRUE Another unusable monstrosity is as follows: > ##union of list of logical values > z[[1]] | z[[2]] | z[[3]] | z[[4]] | z[[5]] [1] TRUE FALSE TRUE FALSE TRUE TRUE Is there a more elegant way to approach this problem and obtain the above logical vectors? Regards, Liviu -- Do you know how to read? http://www.alienetworks.com/srtest.cfm http://goodies.xfce.org/projects/applications/xfce4-dict#speed-reader Do you know how to write? http://garbl.home.comcast.net/~garbl/stylemanual/e.htm#e-mail ______________________________________________ R-help@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.
