[R] efficient test for missing values (NAs)

What is the best way to detect whether or not a (potentially large) matrix contains missing values (NAs) or not? I use if (sum(is.na(x)) 0) {...} are there more efficient ways? /Ali __ R-help@r-project.org mailing list

Re: [R] efficient test for missing values (NAs)

Ali - If all you care about is if there are any missing values (not how many or where they are), I think it would be a bit faster to use if(any(is.na(x))){...} - Phil Spector Statistical Computing Facility

Re: [R] efficient test for missing values (NAs)

?complete.cases Sent from my iPhone On Oct 20, 2010, at 18:53, Ali Tofigh alix.tof...@gmail.com wrote: What is the best way to detect whether or not a (potentially large) matrix contains missing values (NAs) or not? I use if (sum(is.na(x)) 0) {...} are there more efficient ways? /Ali

Re: [R] efficient test for missing values (NAs)

A small test indicates that the following may be the fastest method (although all are pretty fast) has.na - !all(complete.cases(x)) Thanks Jim and Phil for your suggestions. /Ali On Wed, Oct 20, 2010 at 19:03, Jim Holtman jholt...@gmail.com wrote: ?complete.cases Sent from my iPhone On Oct