Python Numpy np.lagder()方法
np.lagroots()方法用于对拉格尔数列进行微分。
语法: np.lagder(c, m=1, scl=1, axis=0)
参数:
c : [array_like] 拉盖尔数列系数的一维数组,从低到高排序。
m : [int, optional] 采取的导数数量,必须是非负数。默认为1。
scl : [标量,可选] 每次微分都要乘以scl。默认为1。
axis : [ int, optional] 获取导数的轴,默认为0。
返回: [ndarray] 导数的Laguerre系列。
代码#1:
# Python program explaining
# numpy.lagder() method
# importing numpy as np
# and numpy.polynomial.laguerre module as geek
import numpy as np
import numpy.polynomial.laguerre as geek
# Input laguerre series coefficients
s = (2, 4, 8)
# using np.lagder() method
res = geek.lagder(s)
# Resulting laguerre series coefficient
print (res)
输出:
[-12. -8.]
代码#2:
# Python program explaining
# numpy.lagder() method
# importing numpy as np
# and numpy.polynomial.laguerre module as geek
import numpy as np
import numpy.polynomial.laguerre as geek
# Laguerre series coefficients
s = (1, 2, 3, 4, 5)
# using np.lagder() method
res = geek.lagder(s, m = 2, scl = 0.5)
# Resulting laguerre series
print (res)
输出:
[ 6.5 3.5 1.25]