Message-ID: <x2ofnc7by5.fsf@blueberry.kubism.ku.dk>
Date: 2001-10-12T22:03:46Z
From: Peter Dalgaard
Subject: MASS: isoMDS and sammon
In-Reply-To: <Pine.LNX.4.33.0110122336360.560-100000@kleigh.nl>
Peter Kleiweg <kleiweg@let.rug.nl> writes:
> 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)
Actually, it should work if you simply define the arguments as
isoMDS <- function(d, y=cmdscale(d, k), k=2, maxit=50, trace=TRUE)
Default arguments can refer to each other and even to items calculated
inside the function.
--
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk) FAX: (+45) 35327907
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