On Fri, Aug 7, 2009 at 9:41 AM, Hamish<[email protected]> wrote: > Markus Neteler wrote: >> echo "345.551054 1 1 >> 364.229489 1 1 >> 382.907925 1 3" | awk ... > .... >> R = (sumXY - sumX*sumY/tot)/((sumsqX - sumX^2/tot)*(sumsqY - >> sumY^2/tot))^0.5; > > sumsqY = 5 > sumY = 5 > tot = 5 > > thus (sumsqY - sumY^2/tot))^0.5 = 0
ok... but how to add "protection"? The original input was 81 rows (pixels with certain temperature and their corresponding altitude from DEM). It prints out print tot, sumX, sumsqX, sumY, sumsqY, sumXY 7432 9.17582e+06 1.14575e+10 7432 7432 9.17582e+06 Mhh, same situation again... perhaps I am just trying nonsense :) cheers Markus PS: Should I commit the BEGIN initialization anyway? _______________________________________________ grass-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-dev
