Finding indices with a certain property
G?ran Brostr?m <gb at stat.umu.se> writes:
I want the indices i for which x[i] < 0 (say):
x <- c(1, -1, 3, 3, -2) where.negative(x)
[1] 2 5 Surely where.negative is something simple, but how?
How about something like this?
indices<-function(x)seq(along=x)[x] x <- c(1, -1, 3, 3, -2) indices(x<0)
[1] 2 5
O__ ---- Peter Dalgaard Blegdamsvej 3 c/ /'_ --- Dept. of Biostatistics 2200 Cph. N (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._