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Python | Numpy np.polyvander() method

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np.polyvander() method is used to returns the Vandermonde matrix of degree deg and sample points x.

Syntax : np.polyvander(x, deg)
Parameters:
x :[ array_like ] 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.
deg :[int] Degree of the resulting matrix.

Return : Return the matrix having size i.e array.size + (degree + 1).

Example #1 :
In this example we can see that by using np.polyvander() method, we are able to get the pseudo-vandermonde matrix using this method.




# import numpy
import numpy as np
import numpy.polynomial.polynomial as geek
  
# using np.polyvander() method
ans = geek.polyvander((1, 3, 5, 7), 2)
  
print(ans)


Output :

[[ 1. 1. 1.]
[ 1. 3. 9.]
[ 1. 5. 25.]
[ 1. 7. 49.]]

Example #2 :




# import numpy
import numpy as np
import numpy.polynomial.polynomial as geek
  
ans = geek.polyvander((1, 2, 3, 4), 3)
  
print(ans)


Output :

[[ 1. 1. 1. 1.]
[ 1. 2. 4. 8.]
[ 1. 3. 9. 27.]
[ 1. 4. 16. 64.]]


Last Updated : 31 Dec, 2019
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