在Python中评估x、y和z的笛卡尔积上的3D勒让德级数
要在Python NumPy中评估x、y和z的笛卡尔积上的3D勒让德级数,可以使用`polynomial.legendre.leggrid3d()`方法。此方法返回在x、y和z的笛卡尔积中的点处的三维切比雪夫级数的值。如果c的维度小于三维,则会隐式地将其形状附加为1以使其成为3D。结果的形状将是c.shape[3:] + x.shape + y.shape + z.shape。
第一个参数是x、y、z。三维级数在x、y和z的笛卡尔积中的点处进行评估。如果x或y是列表或元组,则首先将其转换为ndarray,否则保持不变,如果它不是ndarray,则将其视为标量。
第二个参数是c。系数数组,其排序方式使得多度为i,j的项的系数包含在c[i,j]中。如果c的维度大于二维,则其余索引枚举多组系数。
步骤
首先,导入所需的库:
import numpy as np from numpy.polynomial import legendre as L
创建一个3D系数数组:
c = np.arange(16).reshape(2,2,4)
显示数组:
print("Our Array...\n",c)
检查维度:
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)
要在Python中评估x、y和z的笛卡尔积上的3D勒让德级数,可以使用`polynomial.legendre.leggrid3d()`方法:
print("\nResult...\n",L.leggrid3d([1,2],[1,2],[1,2],c))
示例
import numpy as np from numpy.polynomial import legendre as L # Create a 3D array of coefficients c = np.arange(16).reshape(2,2,4) # 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 3D Legendre series on the Cartesian product of x, y and z use the polynomial.legendre.leggrid3d() method in Python Numpy print("\nResult...\n",L.leggrid3d([1,2],[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]]] Dimensions of our Array... 3 Datatype of our Array object... int64 Shape of our Array object... (2, 2, 4) Result... [[[ 120. 868.] [ 196. 1404.]] [[ 212. 1506.] [ 342. 2412.]]]
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