红宝石 | BigDecimal log()函数

BigDecimal#log() : log()是一个 BigDecimal 类方法，它将小数的自然对数返回到指定的精度位数，数字。

Syntax: BigDecimal.log()

Parameter: BigDecimal values

Return: the natural logarithm of decimal to the specified number of digits of precision, numeric.

示例 #1：

# Ruby code for BigDecimal.log() method
  
# loading library
require 'bigdecimal'
  
# declaring bigdecimal
a = BigDecimal("10")
  
# declaring bigdecimal
b = BigDecimal("1000") *2
  
# declaring bigdecimal
c = BigDecimal("11.43")
  
# log() method
puts "BigDecimal a log method : #{Math.log(a)}\n\n"
  
puts "BigDecimal b log method : #{Math.log(b)}\n\n"
  
puts "BigDecimal a log method : #{Math.log(c)}\n\n"

输出 ：

BigDecimal a log method : 2.302585092994046

BigDecimal b log method : 7.600902459542082

BigDecimal a log method : 2.4362414778067194

示例 #2：

# Ruby code for BigDecimal.log() method
  
# loading library
require 'bigdecimal'
  
# declaring bigdecimal
a = BigDecimal('12')*12
  
# declaring bigdecimal
b = BigDecimal('10')+(22 ** 7.1) ** 10
  
# declaring bigdecimal
c = -BigDecimal('-3')
  
# log() method
puts "BigDecimal a log method : #{Math.log(a)}\n\n"
  
puts "BigDecimal b log method : #{Math.log(b)}\n\n"
  
puts "BigDecimal a log method : #{Math.log(c)}\n\n"

输出 ：

BigDecimal a log method : 4.969813299576001

BigDecimal b log method : 219.46401418844042

BigDecimal a log method : 1.0986122886681098