# union of a list of logical values

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## union of a list of logical values

 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     # 3          4.7          NA          1.3          NA  setosa # 4           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.cfmhttp://goodies.xfce.org/projects/applications/xfce4-dict#speed-readerDo you know how to write? http://garbl.home.comcast.net/~garbl/stylemanual/e.htm#e-mail______________________________________________ [hidden email] mailing list https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide http://www.R-project.org/posting-guide.htmland provide commented, minimal, self-contained, reproducible code.