znk_mod - construct a zernike polynomial.

Calling Sequence

[znk]=znk_mod( order)

Parameters

• order : the order of Zernike polynomial .
• znk : the output Zernike polynomial.

Description

construct a zernike polynomial. This object holds zernike polynomial coefficients. The polynomials used for this function are those in the book of Born and Wolf's . All coefficients will be initialize to zeros.This function uses the real polynomial expansion in which radial polynomials are multiplied by cos(m*phi) and sin(m*phi). For each order n of the expansion, there are n/2+1 possible levels m, given by m = n2, n2+2, ... n for both cos and sin terms. However, for m==0 there is no sin term. notice it is very diffrent to the function zernike

Examples

	znk=znk_mod(1);
	znk=set_znk_cos_coef(znk,1,1,1);
	znk_fits(znk,"znk");
 

Author

Chen jingyuan, Gan guangyong (IAPCM, Beijing,China.)

See Also

zernike ,   set_znk_cos_coef ,   set_znk_sin_coef ,   get_znk_cos_coef ,   get_znk_sin_coef ,   znk_fits ,