[Replying here as Trac is not responding at this time.]

GRASS GIS wrote:

>  > There is no need to modify the existing functions; just check whether
>  > the calculated value is null.
> 
>  Checking if the output is null doesn't tell us if it's null because the
>  nearest input cell is null or because it interpolated to null from nulls
>  in the matrix. 

Try nearest first; if that returns null, then you know that bilinear
and bicubic will also return null, so you can just abort at that
point. Otherwise, try bicubic then bilinear.

-- 
Glynn Clements <[email protected]>
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