When running several r.mapcalc in a loop (via R) the function stops with an error:
ERROR: Error reading null row 2725 for <MASK> The row number varies. This seems to happen at random, and when I repeat the same r.mapcalc calculation that stopped with the error before, things run without problem. I tried after removing the mask, and this time no problem so it may have to do something with the MASK? (as these error messages only occur once in a while, I can't be completely sure it only happens when a MASK is defined). I ran it through R, using the execGRASS() function of the spgrass6 package. I ran the same, but using the system call instead of execGRASS. Still got the same error messages. I therefore guess this has nothing to do with R?
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