From: keiju@... (ÀÐÄÍ·½¼ù )
Date: 1996-12-18T15:28:18+09:00
Subject: [ruby-list:1359] Re: Rational and Complex

���ゅ＠SHLジャパン��. 

In [ruby-list :01335 ] the message: "[ruby-list:1335] Re: Rational and
Complex ", on Dec/18 11:37(JST) sinara@blade.nagaokaut.ac.jp writes:

>def isqrt(d)
>  x = d
>  loop do
>    a = (x + d/x)/2
>    return x if a >= x
>    x = a
>  end
>end
>
>�整数�平方根�求�る�����る����。�����期値を
>d ������。�期値を求�る�� float � sqrt を使��ら早
>��る��？

�る��... newton法��大部簡��アルゴリズム��るん���. bignum�
割算を実装�る��開平法�よ��実装�る��方法�����, 平方根も開
平法�よ�������信��������...

# ��, 開平法を��出��, �れ�ら実装�����ら��り手間����
# ��る��(;_;

����, 冪乗根�, 

def invpow(n, d)
  x = d
  loop do
    a = ((n - 1) * x**(n-1) + d/x)/n
    return x if a >= x
    x = a
  end
end

���ん����??

__
..........................................石塚 圭樹＠SHLジャパン(株)...
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