Hi is colMeans(your.df)
what you want? BTW searching column mean in CRAN gives me the answer on first hit HTH Petr On 14 Dec 2005 at 22:12, Charles Plessy wrote: Date sent: Wed, 14 Dec 2005 22:12:16 +0900 From: Charles Plessy <[EMAIL PROTECTED]> To: r-help@stat.math.ethz.ch Subject: [R] unable to force the vector format Send reply to: [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> <mailto:[EMAIL PROTECTED]> > Dear all, > > I am so ashamed to pollute the list with a trivial question, but it is > a long time I have not used R, and I need a result in the next one or > two hour... > > I have a table which I have loaded with read.table, and I want to make > the mean of its columns. > > > slides <- read.table("slides.txt") > > slides [1:5,] > V1 V2 V3 V4 V5 V6 V7 V8 > 1 PLB00090AA02 0.147 0.018 0.046 0.064 -0.018 -0.008 -0.063 > 2 PLB00090BC08 0.171 0.011 -0.001 0.009 0.052 0.032 -0.065 > 3 PLB00090CG02 0.029 -0.014 -0.042 0.006 0.024 -0.009 -0.043 > 4 PLB00091AA08 0.033 0.050 -0.022 -0.002 0.038 0.015 -0.037 > 5 PLB00091BE02 0.183 0.039 0.052 -0.014 -0.034 -0.037 0.037 > > but I can not get the mean : > > > mean(slides [1,2:8]) > V2 V3 V4 V5 V6 V7 V8 > 0.147 0.018 0.046 0.064 -0.018 -0.008 -0.063 > > obviously, I fail to tell R that I am using a vector. > > > y<- c(1,2,3,4) > > mean(y) > [1] 2.5 > > but as.vector does not solve my problem > > > lapply(as.vector(slides[1,2:8]),sum) > $V2 > [1] 0.147 > > $V3 > [1] 0.018 > > $V4 > [1] 0.046 > > $V5 > [1] 0.064 > > $V6 > [1] -0.018 > > $V7 > [1] -0.008 > > $V8 > [1] -0.063 > > In the end, I would like to use lapply to fill a new column in the > table with the means. (and then extract the closest ones to zero...) > > Once again, sorry for this mail, whose answer is probably trivial, but > it would be an enormous help if somebody could sent it to me! > > -- > Charles > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html Petr Pikal [EMAIL PROTECTED] ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html