Hein,

I think this problem goes away if you use a clean formula, like this:

> model <- glm(t0~ycoord+prec+tempmean+tempmax+tempmin,
family=binomial(link="logit"), data=c3p)

Robert



On Thu, Apr 4, 2013 at 7:42 AM, Jesse Berman <berman.jesse@gmail.com> wrote:

> Hi Hein,
>
> I'm not sure if this will help, but one thing to check is that your
> prediction grid has covariate data for each of the 40,000 cells.  If a
> large
> number of cells have 'NA' as data values, then sometimes the prediction
> will
> not work.  Offhandedly, it strikes me that ycoord may be limited to only
> your t0 locations.
>
> Jesse
>
>
>
> --
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>
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