[GRASS-user] r.mapcalc --> 3 maps

[Gabriele N.]

Ciao grass users.

I have three maps A, B, C.

I would use r.mapcalc to combine them according to this logic:
Put the values of A and if A is null you put the values of B and if B is
null you put the values of C.

I have tried in various ways without success. .. now I'm trying with a
double IF...
r.mapcalc "output = if((isnull(a)),b,if(isnull(b)),c)"  .....but in this
case I do not put the values of A


Help / advice?

Thanks
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