David M. Cooke wrote: > >Conclusions: > >- If you're going to calculate everything in single precision, use Kahan >summation. Using it in double-precision also helps. >- If you can use a double-precision accumulator, it's much better than any of >the techniques in single-precision only. > >- for speed+precision in the variance, either use Kahan summation in single >precision with the two-pass method, or use double precision with simple >summation with the two-pass method. Knuth buys you nothing, except slower >code :-) > >After 1.0 is out, we should look at doing one of the above. > >
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