在Python中区分Chebyshev级数
要区分Chebyshev级数,可以使用Python Numpy库中的polynomial.chebder()方法。该方法返回导数的Chebyshev级数。返回沿轴差异化m次的Chebyshev级数系数c。在每次迭代中,结果都会乘以scl。参数c是低到高次数的系数数组,例如,[1,2,3]表示级数1*T_0 + 2*T_1 + 3*T_2
,而[[1,2],[1,2]]表示1*T_0(x)*T_0(y) + 1*T_1(x)*T_0(y) + 2*T_0(x)*T_1(y) + 2*T_1(x)*T_1(y)
,如果axis=0代表x,axis=1代表y。
第一个参数是c,即Chebyshev级数的系数数组。如果c是多维的,则不同的轴表示不同的变量,每个轴的度数由相应的索引给出。第二个参数是m,表示取多少阶导数,必须是非负数(默认值为1)。第三个参数scl,即每个导数乘以scl,最终结果是乘以scl的m次方。这是用于线性变量替换的(默认值为1)。第四个参数是axis,即进行导数计算的轴(默认值为0)。
步骤
首先,导入所需的库-
import numpy as np
from numpy.polynomial import chebyshev as C
创建一个Chebyshev系数数组 –
c = np.array([1,2,3,4])
显示系数数组 −
print("Our coefficient Array...\n",c)
检查尺寸 –
print("\nDimensions of our Array...\n",c.ndim)
获取数据类型-
print("\nDatatype of our Array object...\n",c.dtype)
获取形状 −
print("\nShape of our Array object...\n",c.shape)
要对Chebyshev系列进行区分,请使用Python Numpy中的polynomial.chebder()方法-
print("\nResult...\n",C.chebder(c))
示例
import numpy as np
from numpy.polynomial import chebyshev as C
# Create an array of Chebyshev series coefficients
c = np.array([1,2,3,4])
# Display the coefficient array
print("Our coefficient Array...\n",c)
# Check the Dimensions
print("\nDimensions of our Array...\n",c.ndim)
# Get the Datatype
print("\nDatatype of our Array object...\n",c.dtype)
# Get the Shape
print("\nShape of our Array object...\n",c.shape)
# To differentiate a Chebyshev series, use the polynomial.chebder() method in Python Numpy.
# The method returns the Chebyshev series of the derivative.
print("\nResult...\n",C.chebder(c))
输出
Our coefficient Array...
[1 2 3 4]
Dimensions of our Array...
1
Datatype of our Array object...
int64
Shape of our Array object...
(4,)
Result...
[14. 12. 24.]