Decimal#ln():ln()是一個Decimal類方法,它返回Decimal值的自然(對數e)對數。
用法:Decimal.ln()
參數:十進製值
返回:十進製值的自然(以e為底)對數。
代碼1:ln()方法示例
# Python Program explaining
# ln() method
# loading decimal library
from decimal import *
# Initializing a decimal value
a = Decimal('.9932')
b = Decimal('0.142857')
# printing Decimal values
print ("Decimal value a : ", a)
print ("Decimal value b : ", b)
# Using Decimal.ln() method
print ("\n\nDecimal a with ln() method : ", a.ln())
print ("Decimal b with ln() method : ", b.ln())
輸出:
Decimal value a : 0.9932 Decimal value b : 0.142857 Decimal a with ln() method : -0.006823225348125508334064182053 Decimal b with ln() method : -1.945911149055813305438686327
代碼2:ln()方法的示例
# Python Program explaining
# ln() method
# loading decimal library
from decimal import *
# Initializing a decimal value
a = Decimal('3.14')
b = Decimal('321e + 5')
# printing Decimal values
print ("Decimal value a : ", a)
print ("Decimal value b : ", b)
# Using Decimal.ln() method
print ("\n\nDecimal a with ln() method : ", a.ln())
print ("Decimal b with ln() method : ", b.ln())
輸出:
Decimal value a : 3.14 Decimal value b : 3.21E+7 Decimal a with ln() method : 1.144222799920161998805694448 Decimal b with ln() method : 17.28436658810024428478960133
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