Python | sympy.expand_func()方法
原文:https://www.geesforgeks.org/python-sympy-expand_func-method/
借助 sympy.expand_func() 方法，我们可以用一些数学恒等式展开特殊函数。
语法: expand_func(表达式)
参数: 表达式–是要展开的数学表达式。
返回:根据一些数学恒等式返回与输入对应的数学表达式。
示例#1:
# import sympy
from sympy import *
x = symbols('x')
expr = gamma(x + 3)
print("Expression = {}".format(expr))
# Use sympy.expand_func() method
expand_expr = expand_func(expr)
print("Expanded Expression : {}".format(expand_expr))
输出:
Expression = gamma(x + 3)
Expanded Expression : x*(x + 1)*(x + 2)*gamma(x)
例 2:
# import sympy
from sympy import *
x = symbols('x')
expr = binomial(x, 3)
print("Expression = {}".format(expr))
# Use sympy.expand_func() method
expand_expr = expand_func(expr)
print("Expanded Expression : {}".format(expand_expr))
输出:
Expression = binomial(x, 3)
Expanded Expression : x*(x - 2)*(x - 1)/6
