Python 使用3D系数数组在x和y的笛卡尔积上评估2D Chebyshev系列
要在x和y的笛卡尔积上评估2D Chebyshev系列,请使用Polynomial.chebgrid2d(x, y, c)方法。该方法返回笛卡尔积中点的二维Chebyshev系列的值。
如果c的维度少于两个,则会隐式地将其形状追加为2D。结果的形状将为c.shape[2:] + x.shape + y.shape。参数x和y是在笛卡尔积中的点评估二维系列。如果x或y是列表或元组,则它将首先转换为ndarray,否则将保持不变,并且如果它不是ndarray,则将其视为标量。
参数c是一个按顺序排列的系数数组,使得多重系数i,j的系数包含在c[i,j]中。如果c的维度大于两个,则剩余的索引将枚举多组系数。
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3D系数数组 −
c = np.arange(24).reshape(2,2,6)
显示数组 –
print("Our 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)
获得形状 –
print("\nShape of our Array object...\n",c.shape)
要在x和y的笛卡尔积上评估2-D Chebyshev序列,请使用Python中的polynomial.chebgrid2d(x, y, c)方法。
print("\nResult...\n",C.chebgrid2d([1,2],[1,2], c))
示例
import numpy as np
from numpy.polynomial import chebyshev as C
# Create a 3d array of coefficients
c = np.arange(24).reshape(2,2,6)
# Display the array
print("Our 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 evaluate a 2-D Chebyshev series on the Cartesian product of x and y, use the polynomial.chebgrid2d(x, y, c) method in Python
print("\nResult...\n",C.chebgrid2d([1,2],[1,2], c))
输出
Our Array...
[[[ 0 1 2 3 4 5]
[ 6 7 8 9 10 11]]
[[12 13 14 15 16 17]
[18 19 20 21 22 23]]]
Dimensions of our Array...
3
Datatype of our Array object...
int64
Shape of our Array object...
(2, 2, 6)
Result...
[[[ 36. 60.]
[ 66. 108.]]
[[ 40. 66.]
[ 72. 117.]]
[[ 44. 72.]
[ 78. 126.]]
[[ 48. 78.]
[ 84. 135.]]
[[ 52. 84.]
[ 90. 144.]]
[[ 56. 90.]
[ 96. 153.]]]