  # Python | Numpy np.chebval2d () method

NumPy | Python Methods and Functions

Using the method `np.chebval2d() `, we can get an array of coefficients after evaluating by (x, y) on Chebyshev series using ` np.chebval2d ( ) `.

Syntax: ` np.chebval2d (x, y, c) `
Return : Return an array after evaluation on (x, y).

Example # 1:
In this example, we see that using ` np.chebval2d () ` we can get an array of coefficients by evaluating (x, y) by Chebyshev series.

` `

` # import NumPy import numpy as np import numpy.polynomial.chebyshev as cheb   # using the np.chebval2d () method gfg = cheb.chebval2d (( 2 , 5 ), ( 1 , 3 ), ( 2 , - 4 , 1 ))   print ( gfg) `

Output:

[32. 94.]

Example # 2:

 ` # NumPy import ` ` import ` ` numpy as np ` ` import ` ` numpy.polynomial.chebyshev as cheb `   ` # using the np.chebval2d () method ` ` gfg ` ` = cheb.chebval2d (( 1 , 3 , 5 , 7 ), ( 2 , 4 , 8 ), (` ` 2 ` `, ` ` - ` ` 4 ` `, ` ` 1 ` `, ` ` 5 ` `, ` ` 1 ` `)) `   ` print ` ` (gfg) `

Exit :

[719680. 6486180.52831708.]