Message-ID: <Pine.GSO.4.03.9901281026580.16506-100000@wompom.biostat.washington.edu>
Date: 1999-01-28T18:30:55Z
From: Thomas Lumley
Subject: NAs spoil lowess smoothing
In-Reply-To: <XFMail.990128121544.s-luppescu@uchicago.edu>
On Thu, 28 Jan 1999, Stuart Luppescu wrote:
> Can anyone explain to me what this error message means, why I'm getting it, and
> how to fix it?
>
> lines(lowess(xdat, ydat, f=.5), col=3)
> Error: NAs in foreign function call (arg 1)
It means that in a call to .C or .Fortran there are missing values in the
first argument. The call to .C is inside lowess(), and its first argument
is the x data. So you're getting it because there are NAs in xdat.
You can fix it by removing the NAs, eg
good<-!(is.na(xdat) | is.na(ydat))
lines(lowess(xdat[good],ydat[good],f=.5),col=3)
Refusing to handle NAs is the usual default behaviour of functions. Some
functions have na.action= arguments to control this, but lowess doesn't.
Thomas Lumley
Assistant Professor, Biostatistics
University of Washington, Seattle
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