Python sympy.bernoulli()方法
在sympy.bernoulli()方法的帮助下,我们可以在SymPy中找到伯努利数和伯努利多项式。
bernoulli(n) –
语法: bernoulli(n)
参数 :
n –它表示第n个伯努利数。
返回:返回第n个伯努利数。
示例 #1:
# import sympy
from sympy import * n = 4
print("Value of n = {}".format(n))
# Use sympy.bernoulli() method
nth_bernoulli = bernoulli(n)
print("Value of nth bernoulli number : {}".format(nth_bernoulli))
输出:
Value of n = 4
Value of nth bernoulli number : -1/30
bernoulli(n, k)-
语法: bernoulli(n, k)
参数 :
n – 它表示伯努利多项式的阶数。
k – 它表示伯努利多项式中的变量。
返回: 返回伯努利多项式的表达式或其值。
示例 #2:
# import sympy
from sympy import * n = 5
k = symbols('x')
print("Value of n = {} and k = {}".format(n, k))
# Use sympy.bernoulli() method
nth_bernoulli_poly = bernoulli(n, k)
print("The nth bernoulli polynomial : {}".format(nth_bernoulli_poly))
输出:
Value of n = 5 and k = x
The nth bernoulli polynomial : x**5 - 5*x**4/2 + 5*x**3/3 - x/6
示例 #3:
# import sympy
from sympy import * n = 4
k = 3
print("Value of n = {} and k = {}".format(n, k))
# Use sympy.bernoulli() method
nth_bernoulli_poly = bernoulli(n, k)
print("The nth bernoulli polynomial value : {}".format(nth_bell_poly))
输出:
Value of n = 4 and k = 3
The nth bernoulli polynomial value : 10*x1**2*x3 + 15*x1*x2**2