Re: [R] calculating mean matrix

2013-01-19 Thread arun
579.4 473.2 585.1 508.3 643.7 432.1 587.2 547.6 506.2   #9  471.8 321.0 375.8 394.4 355.5 434.4 532.1 640.5 490.1 619.1   #10 356.6 434.3 403.9 445.0 416.2 532.8 570.9 548.9 697.9 488.8 A.K. - Original Message - From: ya To: r-help Cc: Sent: Saturday, January 19, 2013 9:49 AM Subject: [R]

Re: [R] calculating mean matrix

2013-01-19 Thread ya
p-boun...@r-project.org [mailto:r-help-bounces@r- > project.org] On Behalf Of ya > Sent: Saturday, January 19, 2013 8:50 AM > To: r-help > Subject: [R] calculating mean matrix > > Hi list, > > Thank you vey much for reading this post. > > I have a data frame, I am trying

Re: [R] calculating mean matrix

2013-01-19 Thread Arunkumar Srinivasan
One way using `Reduce`: set.seed(45) grp <- factor(rep(letters[1:10], each=10)) # equivalent of your column x # dummy data df <- as.data.frame(matrix(sample(1:1000, replace=T), ncol=length(levels(grp # solution Reduce('+', split(df, grp))/length(levels(grp)) Arun On Saturday, January 1

Re: [R] calculating mean matrix

2013-01-19 Thread David L Carlson
Associate Professor of Anthropology Texas A&M University College Station, TX 77843-4352 > -Original Message- > From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- > project.org] On Behalf Of ya > Sent: Saturday, January 19, 2013 8:50 AM > To: r-help > Subj

[R] calculating mean matrix

2013-01-19 Thread ya
Hi list, Thank you vey much for reading this post. I have a data frame, I am trying to split it into a couple of data frame using one of the columns, say, x. After I get the data frames, I am planning to treat them as matrices and trying to calculate an element by element mean matrix. Could an