search for: 9999s

Dear all, I'm trying to replace NA values with -9999 in one column of a data frame. I've tried using is.na and the testdata[testdata$onecolumn==NA] <- 9999 approach, but whilst neither generate errors, neither result in -9999s appearing - the NAs remain there! I'd be grateful for any advice on what I'm doing wrong or any other suitable approaches. Many thanks, Steve _________________________________________________________________ oticons.

I am trying to extract rows from a data.frame based on the presence/absence of a single value in any column. I've figured out how to do get the positive matches, but the remainder (rows without this value) eludes me. Mining the help pages and archives brought me, frustratingly, very close, as you'll see below. My goal: two data frames, one with -99 in at least one column in each row,