Python | Numpy np.leg2poly() method

np.leg2poly() method is used to convert a legendre series to a polynomial.

Syntax : np.leg2poly(c)
Parameters:
c :[array_like] 1-D arrays of legendre series coefficients ordered from low to high.

Return : [ndarray] 1-D array containing the coefficients of the equivalent polynomial.

Code #1 :

# Python program explaining
# numpy.leg2poly() method

# importing numpy as np
# and numpy.polynomial.legendre module as geek
import numpy as np
import numpy.polynomial.legendre as geek

# Input legendre series coefficients

c = np.array([0.1, 0.2, 0.3, 0.4, 0.5])

# using np.leg2poly() method
res = geek.leg2poly(c)

# Resulting equivalent polynomial series coefficient
print (res)

Output:

[ 0.1375 -0.4    -1.425   1.      2.1875]

Code #2 :

# Python program explaining
# numpy.leg2poly() method

# importing numpy as np
# and numpy.polynomial.legendre module as geek
import numpy as np
import numpy.polynomial.legendre as geek

# Input legendre series coefficients

c = ( 1, 2, 3, 4, 5)

# using np.leg2poly() method
res = geek.leg2poly(c)

# Resulting equivalent polynomial series coefficient
print (res)

Output:

[  1.375  -4.    -14.25   10.     21.875]