Hi, Let say I have below matrix
mdat <- matrix(c(1,2,3, 11,12,13), nrow = 2, ncol = 3, byrow = TRUE, dimnames = list(c("row1", "row2"), c("C.1", "C.2", "C.3"))) Now I can extract a raw by rowname as > mdat['row1', ] C.1 C.2 C.3 1 2 3 However I am also looking for was to extract values as NA when a rowname is supplied which is not existing rownames I should get > mdat['new_raw', ] C.1 C.2 C.3 NA NA NA Current it throws error as default functionality. Is there any way to force R to provide values as NA instead of showing any errore? [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.