尊龙凯时人生就是搏

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Å£¶Ùµü´ú¹«Ê½¿ÉÓÃÓÚÇó½â·½³Ì f(x) = 0 µÄ¸ù£¬ÆäʹÓõü´úÀú³Ì x[n+1] = x[n] – f(x[n]) / f'(x[n])£¬ÆäÖÐ f(x) ΪĿµÄ·½³Ì£¬f'(x) ΪÆäµ¼Êý ¡£python ´úÂëʵÏÖÁ˸ù«Ê½£¬°üÀ¨ÒÔÏ°취£º³õʼ»¯ÍƲâÖµ x0 ¡£Æ¾Ö¤µü´ú¹«Ê½¸üРx Öµ ¡£µ±¸üÐÂÖµÓëÇ°Ò»´ÎÖµÏà²îСÓÚÈݲîʱ£¬·µ»Ø¸ù ¡£ÈôÊǵִï×î´óµü´ú´ÎÊý£¬ÔòÅ׳öÒì³££¬ÅúעδÕÒµ½¸ù ¡£

Å£¶Ùµü´ú¹«Ê½ Python ʵÏÖ

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Å£¶Ùµü´ú¹«Ê½ÓÃÓÚÇó½â·½³Ì f(x) = 0 µÄ¸ù ¡£¸Ã¹«Ê½»ùÓÚÒÔϵü´úÀú³Ì£º

x[n+1] = x[n] - f(x[n]) / f'(x[n])

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Á¬Ã¦Ñ§Ï°¡°PythonÃâ·ÑѧϰÌõ¼Ç£¨ÉîÈ룩¡±£»

  • x[n] Êǵü´úÀú³ÌµÄµÚ n ´Îµü´úÖµ
  • f(x) ÊÇÄ¿µÄ·½³Ì
  • f'(x) ÊÇ f(x) µÄµ¼Êý

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def newton_method(f, fprime, x0, tol=1e-6, max_iter=100):
    """
    Å£¶Ùµü´ú·¨Çó½â·½³Ì f(x) = 0 µÄ¸ù¡£

    ²ÎÊý£º
        f: Ä¿µÄ·½³Ì
        fprime: Ä¿µÄ·½³ÌµÄµ¼Êý
        x0: ³õʼÍƲâÖµ
        tol: Èݲî
        max_iter: ×î´óµü´ú´ÎÊý

    ·µ»Ø£º
        ·½³ÌµÄ¸ù£¨½üËÆÖµ£©
    """

    x = x0
    for i in range(max_iter):
        x_prev = x
        x = x - f(x) / fprime(x)
        if abs(x - x_prev) <p><strong>ʹÓÃʾÀý</strong></p><p>¿ÉÒÔʹÓÃÒÔÏ´úÂëÇó½â·½³Ì f(x) = x^2 - 1£º</p><pre class="brush:php;toolbar:false">import numpy as np

def f(x):
    return x**2 - 1

def fprime(x):
    return 2 * x

root = newton_method(f, fprime, 1.5)
print(root)  # Êä³ö£ºÔ¼ 1.0

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