[Rd] MASS: isoMDS and sammon

Peter Kleiweg kleiweg@let.rug.nl
Fri, 12 Oct 2001 23:56:52 +0200 (CEST)

If tbl is an object of class 'dist', you can do this:

    a <- sammon(tbl, k=3)

But you can't do this:

    b <- isoMDS(tbl, k=3)

Wouldn't it be sensible to have identical interfaces to sammon()
and isoMDS() ?

I think all that would be needed is to change this:

  isoMDS <- function(d, y=cmdscale(d, 2), maxit=50, trace=TRUE)

...into this:

  isoMDS <- function(d, y, k=2, maxit=50, trace=TRUE)
    if(missing(y)) y <- cmdscale(d, k=k)

Peter Kleiweg

r-devel mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-devel-request@stat.math.ethz.ch