You could add attributes to your array when creating it and then retrieve them:
x <- matrix(1:8,2,4) attr(x,"workers") <- 1 attr(x,"variables") <- 2 apply(x,attr(x,"variables"),sum) or perhaps: y <- matrix(1:8,2,4) attr(y,"margins") <- list(workers = 1, variables = 2) apply(y,attr(y,"margins")$variables,sum) These are simple enough that you might not need to develop your own apply but you could pretty them up even more if you did: my.apply <- function(x,dim,fn) apply(x,attr(x,dim),fn) my.apply(x,"variables",sum) --- From: <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Subject: [R] Array Dimension Names I would like to reference array dimensions by name in an apply and a summary function. For example: apply(x, "workers", sum) Is there a better way to do this than creating a new attribute for the array and then creating new methods for apply and summary? I don't want to name the individual elements of each dimension (such as with dimnames) but rather name the dimensions. Thanks for your help. Benjamin Stabler Transportation Planning Analysis Unit Oregon Department of Transportation 555 13th Street NE, Suite 2 Salem, OR 97301 Ph: 503-986-4104 _______________________________________________ No banners. No pop-ups. No kidding. Introducing My Way - http://www.myway.com ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
