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Author tim.peters
Recipients mark.dickinson, martin.panter, ned.deily, rhettinger, serhiy.storchaka, steven.daprano, tim.peters, vstinner
Date 2016-09-02.02:07:31
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BTW, add this other way of writing a native-precision Newton step to see that it's much worse (numerically) than writing it in the "guess + small_correction" form used in  Mathematically they're identical, but numerically they behave differently:

def native2(x, n):
    g = x**(1.0/n)
    if g**n == x:
        return g
    return ((n-1)*g + x/g**(n-1)) / n
Date User Action Args
2016-09-02 02:07:31tim.peterssetrecipients: + tim.peters, rhettinger, mark.dickinson, vstinner, ned.deily, steven.daprano, martin.panter, serhiy.storchaka
2016-09-02 02:07:31tim.peterssetmessageid: <>
2016-09-02 02:07:31tim.peterslinkissue27761 messages
2016-09-02 02:07:31tim.peterscreate