Bill, Thanks for the illuminating example! I think instead of > // substitute source of values for 'Xi', 'Yj' > // and 'Zij' in these three lines > data[0][i + 5*j] = Xi; > data[0][i + 5*j] = Yi; > data[0][i + 5*j] = Zij; it really should be // substitute source of values for 'Xi', 'Yj' // and 'Zij' in these three lines data[0][i + 5*j] = Xi; data[1][i + 5*j] = Yi; data[2][i + 5*j] = Zij; --Russ
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