From kleiweg@let.rug.nl  Fri Oct 12 22:56:52 2001
From: kleiweg@let.rug.nl (Peter Kleiweg)
Date: Fri, 12 Oct 2001 23:56:52 +0200 (CEST)
Subject: [Rd] MASS: isoMDS and sammon
Message-ID: <Pine.LNX.4.33.0110122336360.560-100000@kleigh.nl>


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
http://www.let.rug.nl/~kleiweg/

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[Rd] MASS: isoMDS and sammon
Peter Kleiweg