[R] error with surf.ls in spatial

[Prof Brian D Ripley]

On Tue, 25 Sep 2001, Stewart Schultz wrote:

> Hello R users,
>
> Can someone point me to a solution to the problem below?  The surf.ls()

Read the help page!  Surely if a function does not work the first thing to
do is to chexk that you are calling it correctly.

Arguments:

      np: degree of polynomial surface

       x: x coordinates or a data frame with columns `x', `y', `z'

Your object midxy (presumably a data frame) is not of the specified form.
However,

surf.ls(2, midxy$V1, midxy$V2, midxy$X3)

works.  Calling it topo.kr (not on dataset topo) is bound to lead to
confusion.

> call works fine in other contexts, e.g. the example in help(surf.ls).  I'm
> using R 1.3.1, and get the same error regardless of the platform (debian
> Linux, MS Windows 98).

[...]

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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