[Rd] bug (PR#13570)

[rhafen at stat.purdue.edu]

<<insert bug report here>>

This is a CRITICAL bug!!!  I have verified it in R 2.8.1 for mac and  
for windows.  The problem is with loess degree=0 smoothing.  For  
example, try the following:

x <- 1:100
y <- rnorm(100)
plot(x, y)
lines(predict(loess(y ~ x, degree=0, span=0.5)))

This is obviously wrong.

R 2.8

--please do not edit the information below--

Version:
  platform = i386-apple-darwin8.11.1
  arch = i386
  os = darwin8.11.1
  system = i386, darwin8.11.1
  status =
  major = 2
  minor = 8.1
  year = 2008
  month = 12
  day = 22
  svn rev = 47281
  language = R
  version.string = R version 2.8.1 (2008-12-22)

GUI:
  R-GUI 1.27 (5301)

Locale:
en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8

Search Path:
  .GlobalEnv, tools:RGUI, package:stats, package:graphics,  
package:grDevices, package:utils, package:datasets, package:Rutils,  
package:methods, Autoloads, package:base