Le dimanche 3 septembre 2017 16:06:46 UTC+2, rjf a écrit : > > I was doing timing on the same task and found that one system > (used for celestial mechanics) was spectacularly fast on a test just like > this one. > One reason was that it first changed f*(f+1) to > > f^2 +f > and was clever in computing f^2. You should be clever > at this too. > > Anyway, be careful when you are testing. > > giac does not cheat, it does the product f*(f+1) not f^2+f. For more details, you can have a look at Bill Hart blog: http://wbhart.blogspot.fr/2017/07/update-on-fast-multivariate-polynomial.html
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