[GRASSLIST:5510] A problem with computation in r.mapcalc

[Miha STAUT]

Hi all,

I have a problem computing this with r.mapcalc:

r.mapcalc < avg # piping
avg=10*log((
10^(rast1/10-12)*6.863636
+10^(rast2/10-12)*2.909091
+10^(rast3/10-12)*3.742424
+10^(rast4/10-12)*2.333333
+10^(rast5/10-12)*2.318182
+10^(rast6/10-12)*3.590909
+10^(rast7/10-12)*0.969697
+10^(rast8/10-12)*2.435484
)
*10^12/30.84457
,10)

The process of computing seems to finish OK, but the new map gives only NAs. 
Why can that be? The problem appearently lies in the 10^rast. All the 
rasters have values between 0 and 140. The final map should not have 
excessively high values.

How should I surround the problem?

Thanks in advance, Miha

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