yanfeng42/logB.scm

Created December 31, 2020 05:27

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可能很有用的工具方法: 计算任意底数的对数

Raw

	(define logB
	(lambda (x B)
	(/ (log x) (log B))))

	(define (log3 x)
	(logB x 3)
	)

	; (log3 9) -> 2.0

Author

yanfeng42 commented Dec 31, 2020

不同语言, 一般不直接提供计算任意底数的对数的方法.

源码来源于: https://en.wikibooks.org/wiki/Scheme_Programming/Further_Maths#Logarithm
这样做的数学基础和 Swift 实现, 可以参考: https://stackoverflow.com/a/35886846

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