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Generate a Vandermonde matrix of given degree with float array of points in Python
To generate a Vandermonde matrix of given degree, use the polynomial.polyvander() in Python Numpy. The method returns rhe Vandermonde matrix. The shape of the returned matrix is x.shape + (deg + 1,), where the last index is the power of x. The dtype will be the same as the converted x.
The parameter, a is Array of points. The dtype is converted to float64 or complex128 depending on whether any of the elements are complex. If x is scalar it is converted to a 1-D array. The parameter, deg is the degree of the resulting matrix.
Steps
At first, import the required libraries −
import numpy as np from numpy.polynomial.polynomial import polyvander
Create an array −
x = np.array([0, 3.5, -1.4, 2.5])
Display the array −
print("Our Array...
",x)Check the Dimensions −
print("
Dimensions of our Array...
",x.ndim)
Get the Datatype −
print("
Datatype of our Array object...
",x.dtype)Get the Shape −
print("
Shape of our Array object...
",x.shape)
To generate a Vandermonde matrix of given degree, use the polynomial.polyvander() in Python Numpy −
print("
Result...
",polyvander(x, 2))Example
import numpy as np
from numpy.polynomial.polynomial import polyvander
# Create an array
x = np.array([0, 3.5, -1.4, 2.5])
# Display the array
print("Our Array...
",x)
# Check the Dimensions
print("
Dimensions of our Array...
",x.ndim)
# Get the Datatype
print("
Datatype of our Array object...
",x.dtype)
# Get the Shape
print("
Shape of our Array object...
",x.shape)
# To generate a Vandermonde matrix of given degree, use the polynomial.polyvander() in Python Numpy
print("
Result...
",polyvander(x, 2))Output
Our Array... [ 0. 3.5 -1.4 2.5] Dimensions of our Array... 1 Datatype of our Array object... float64 Shape of our Array object... (4,) Result... [[ 1. 0. 0. ] [ 1. 3.5 12.25] [ 1. -1.4 1.96] [ 1. 2.5 6.25]]
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