Re: [R] tapply function with NA

2010-05-10 Thread Gabor Grothendieck
See ?colSums On Mon, May 10, 2010 at 12:44 AM, vincent.deluard wrote: > > Hi R users, > > I have a matrix "m" of the type: > > m >       X4.20.2010 X4.19.2010   X4.16.2010 > [1,]  0.008319468 0. -0.008250825 > [2,]  0.005574136 0.01816118  0.073081608 > [3,] -0.047830688 0.01612903 -0.030

Re: [R] tapply function with NA

2010-05-09 Thread RICHARD M. HEIBERGER
It is exactly the same tmp <- matrix(1:24,6,4) tmp[4,] <- NA tmp apply(tmp, 2, sum, na.rm=TRUE) [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting gu

Re: [R] tapply function

2009-11-03 Thread Sundar Dorai-Raj
you must have missing values in "data". Try tapply(data, group, mean, na.rm = TRUE) If that's not the case, read the bottom of this email about the posting guide. HTH, --sundar On Tue, Nov 3, 2009 at 5:28 AM, FMH wrote: > Hi, > > I tried to use tapply function to find the mean of the data in