使用Python中的多维系数区分切比雪夫级数
要区分一个切比雪夫级数,可以使用Python Numpy中的polynomial.chebder()方法。该方法返回导数的切比雪夫级数。返回沿着轴差分m次的切比雪夫级数系数c。在每次迭代中,结果都乘以scl。参数c是一个包含每个轴上从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]]
表示级数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是x轴,axis=1是y轴。
第一个参数是c,一个包含切比雪夫级数系数的数组。如果c是多维的,则不同的轴对应于不同的变量,每个轴上的次数由相应的索引给出。第二个参数是m,表示要进行的导数次数,必须是非负的。(默认值:1)
第三个参数是scl,即每个导数都乘以scl。最终结果是乘以scl的m次方。这用于线性变量的变换。(默认值:1)。第四个参数是axis,即沿着哪个轴进行导数运算。(默认值: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系数的多维数组 −
c = np.arange(4).reshape(2,2)
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)
要区分切比雪夫级数,可以在Python中使用polynomial.chebder()方法。
print("\nResult...\n",C.chebder(c))
示例
import numpy as np
from numpy.polynomial import chebyshev as C
# Create a multidimensional array of Chebyshev series coefficients
c = np.arange(4).reshape(2,2)
# 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...
[[0 1]
[2 3]]
Dimensions of our Array...
2
Datatype of our Array object...
int64
Shape of our Array object...
(2, 2)
Result...
[[2. 3.]]