[R] "Local trend surfaces" Ex from V&R MASS

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From: Ted Harding (Ted.Harding@nessie.mcc.ac.uk)
Date: Sat 08 Mar 2003 - 01:11:26 EST 

Message-id: <XFMail.030307141126.Ted.Harding@nessie.mcc.ac.uk>

Hi Folks,

I'm probably overlooking some small point, but can't see it.

Trying the "Local trend surfaces" example from p.437 of MASS
(3rd edn) by V&R, all goes well until the line

contour(topo.mar$x, topo.mar$y, topo.lo$fit,
        levels=seq(700,1000,25), xlab="fi t", ylab="")

which produces the response:

  Error in contour.default(topo.mar$x, topo.mar$y, topo.lo$fit,
  levels = seq(700, :
          no proper `z' matrix specified

I've checked the sizes of topo.mar$x, topo.mar$y and topo.lo$fit, and
they should all line up, so I can't see why "no proper `z' matrix
specified". I notice that topo.lo$fit has NAs (but "NA's are allowed"
according to "?contour") and wonder if this may be causing a problem
(options("na.action")->[1] "na.omit").

Using R 1.6.2 here ...

Thanks for any info,
Ted.

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Date: 07-Mar-03 Time: 14:11:26
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