Tena koe Ken I may be misunderstanding you, but it seems to me you have a four dimensional array. If so:
ken <- array(rnorm(5*3*2*10), dim=c(5,3,2,10)) ken[,1,1,] ken[1,,1,] may be sufficient to get you going. HTH .... Peter Alspach > -----Original Message----- > From: r-help-boun...@r-project.org > [mailto:r-help-boun...@r-project.org] On Behalf Of Ken-JP > Sent: Tuesday, 21 April 2009 12:58 p.m. > To: r-help@r-project.org > Subject: [R] n-dimensional vector operations > > > > Let's start with a concrete case of n=3 dimensions. > > Along dimension x, I have a matrix of 5 vectors (each with > ten rows) Along dimension y, I have a matrix of 3 vectors > (each with ten rows) Along dimension z, I have a matrix of 2 > vectors (each with ten rows) > > I am trying to write a: > > function(..., funcp) { } > > where funcp(...) is an operator which works on n vectors and > returns a numeric. For example, averages n=3 columns (one > from each dimension) and takes the standard-deviation of the > resultant vector. > > So answer should be a matrix of dimension( 5, 3, 2 ) of > numeric, in this case. At position (4, 2, 1) we would find > the numeric answer to funcp( x[,4],y[,2],z[,1] ). > > ------------------------------------------------------------ > set.seed( 1 ); > x <- matrix( runif( 50 ), nrow=10); > y <- matrix( runif( 30 ), nrow=10); > z <- matrix( runif( 20 ), nrow=10); > > foo <- function(...,funcp) > { > matrices <- list(...); > n.matrices <- length( matrices ); > # What should I put here?!?! ------------------------------------- > } > > > > -- > View this message in context: > http://www.nabble.com/n-dimensional-vector-operations-tp231476 > 07p23147607.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > 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. > The contents of this e-mail are confidential and may be subject to legal privilege. If you are not the intended recipient you must not use, disseminate, distribute or reproduce all or any part of this e-mail or attachments. If you have received this e-mail in error, please notify the sender and delete all material pertaining to this e-mail. Any opinion or views expressed in this e-mail are those of the individual sender and may not represent those of The New Zealand Institute for Plant and Food Research Limited. ______________________________________________ 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.
