Python | Numpy np.polyvander() method
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 as np
import numpy.polynomial.polynomial as geek
ans = geek.polyvander(( 1 , 3 , 5 , 7 ), 2 )
print (ans)
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Output :
[[ 1. 1. 1.]
[ 1. 3. 9.]
[ 1. 5. 25.]
[ 1. 7. 49.]]
Example #2 :
import numpy as np
import numpy.polynomial.polynomial as geek
ans = geek.polyvander(( 1 , 2 , 3 , 4 ), 3 )
print (ans)
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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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