On May 15, 2013, at 11:24 PM, Pascal Oettli wrote: > Hi, > > You probably should read R documentation and learn how to use "seq" > > ?seq > ?rowMeans > > HTH, > Pascal > > > On 05/16/2013 03:17 PM, Zilefac Elvis wrote: >> Hello, >> >> I need your help on this matrix: >> >> >> 1 1 1 1 1 1 >> 2 2 2 2 2 2 >> 3 3 3 3 3 3 >> 5 5 5 5 5 5 >> 2 2 2 2 2 2 >> 3 3 3 3 3 3 >> 6 6 6 6 6 6 >> 2 2 2 2 2 2 >> 3 3 3 3 3 3 >> 1 1 1 1 1 1 >> 2 2 2 2 2 2 >> 3 3 3 3 3 3 >> >> First three rows represent first simulation, next three rows = second >> simulation etc. >> I would like to estimate the values in row 1 for example by taking the mean >> of rows 1, 4, 7, 10. Do same for all other rows. So the resulting matrix is >> 3-by-6.
It seems from the dimensions expected that what your really want is not means of rows but rather means of columns. matrix( c( colMeans( sim[c(TRUE,FALSE,FALSE), ]), # recycling picks out 1,4,7,10, ... colMeans( sim[c(FALSE,TRUE,FALSE), ]), colMeans( sim[c(FALSE,FALSE,TRUE), ])), ncol=6, byrow=TRUE) -- David Winsemius Alameda, CA, USA ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
