在Python中生成拉盖尔多项式和x、y复数点阵的伪范德蒙德矩阵
要生成拉盖尔多项式的伪范德蒙德矩阵,可以使用Python Numpy中的`laguerre.lagvander2d()`。该方法返回伪范德蒙德矩阵。返回矩阵的形状为x.shape + (deg + 1,),其中最后一个索引是相应拉盖尔多项式的阶数。dtype将与转换后的x相同。
参数x、y返回点阵。dtype根据元素是否为复数转换为float64或complex128。如果x是标量,则将其转换为一维数组。参数deg是一个最大阶数列表,形式为[x_deg, y_deg]。
步骤
首先,导入所需的库:
import numpy as np from numpy.polynomial import laguerre as L
使用numpy.array()方法创建形状相同的点坐标数组:
x = np.array([-2.+2.j, -1.+2.j]) y = np.array([1.+2.j, 2.+2.j])
显示数组:
print("Array1...\n",x) print("\nArray2...\n",y)
显示数据类型:
print("\nArray1 datatype...\n",x.dtype) print("\nArray2 datatype...\n",y.dtype)
检查两个数组的维度:
print("\nDimensions of Array1...\n",x.ndim) print("\nDimensions of Array2...\n",y.ndim)
检查两个数组的形状:
print("\nShape of Array1...\n",x.shape) print("\nShape of Array2...\n",y.shape)
要生成拉盖尔多项式的伪范德蒙德矩阵,可以使用Python Numpy中的`laguerre.lagvander2d()`:
x_deg, y_deg = 2, 3 print("\nResult...\n",L.lagvander2d(x,y, [x_deg, y_deg]))
示例
import numpy as np from numpy.polynomial import laguerre as L # Create arrays of point coordinates, all of the same shape using the numpy.array() method x = np.array([-2.+2.j, -1.+2.j]) y = np.array([1.+2.j, 2.+2.j]) # Display the arrays print("Array1...\n",x) print("\nArray2...\n",y) # Display the datatype print("\nArray1 datatype...\n",x.dtype) print("\nArray2 datatype...\n",y.dtype) # Check the Dimensions of both the array print("\nDimensions of Array1...\n",x.ndim) print("\nDimensions of Array2...\n",y.ndim) # Check the Shape of both the array print("\nShape of Array1...\n",x.shape) print("\nShape of Array2...\n",y.shape) # To generate a pseudo Vandermonde matrix of the Laguerre polynomial, use the laguerre.lagvander2d() in Python Numpy x_deg, y_deg = 2, 3 print("\nResult...\n",L.lagvander2d(x,y, [x_deg, y_deg]))
输出
Array1... [-2.+2.j -1.+2.j] Array2... [1.+2.j 2.+2.j] Array1 datatype... complex128 Array2 datatype... complex128 Dimensions of Array1... 1 Dimensions of Array2... 1 Shape of Array1... (2,) Shape of Array2... (2,) Result... [[ 1. +0.j 0. -2.j -2.5 -2.j -4.66666667 +0.33333333j 3. -2.j -4. -6.j -11.5 -1.j -13.33333333 +10.33333333j 5. -8.j -16. -10.j -28.5 +10.j -20.66666667 +39.j ] [ 1. +0.j -1. -2.j -3. +0.j -2.33333333 +3.33333333j 2. -2.j -6. -2.j -6. +6.j 2. +11.33333333j 1.5 -6.j -13.5 +3.j -4.5 +18.j 16.5 +19.j ]]
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