[GRASS-user] MAP Calculator mean of eight neighbors to interpolate 0 value in raster map

[stephen sefick]

if(0, (sum([-1,1], [0, 1], [1,1], [-1,0], [0,0], [1,0],[-1,-1],
[0,-1],[1,-1])/8))

I want to use mapcalc to do the above.  I am missing a syntax step.
if a value is zero take the average of the eight nearest neighbors and
replace the value with this.  Otherwise, keep the value unchanged

-- 
Stephen Sefick

Let's not spend our time and resources thinking about things that are
so little or so large that all they really do for us is puff us up and
make us feel like gods.  We are mammals, and have not exhausted the
annoying little problems of being mammals.

								-K. Mullis