;+
; NAME: 
;	BIVARIATECUBIC.pro
; PURPOSE: 
;	To evaluate a bi-variate cubic given the parameters and an x, y list
; DESCRIPTION:
; CATEGORY:
; CALLING SEQUENCE:
;  BIVARIATECUBIC par, x, y, res
; INPUTS:
;   par  - The parameters
;   x - The x values
;   y - The y values
; OUTPUTS:
;   res - the result of the evaluation
; KEYWORD OUTPUT PARAMETERS:
; COMMON BLOCKS:
; SIDE EFFECTS:
; RESTRICTIONS:
; PROCEDURE:
; MODIFICATION HISTORY:
; 3-MAY-2004, CBO, SwRI
;-
pro	BIVARIATECUBIC, par, x, y, res
;
; This procedure reads in a list of (x,y) points and the parameters array is [a,b,c,d,e,f]:
;  res(x,y) = a + bx + cy + dxy + ex^2 + fy^2 + gx^2y + h y^2 x + i x^3  j y^3.  
;

res = par[0] + par[1]*x + par[2]*y + $
					par[3]*x*y + par[4]*x^2 + par[5]*y^2+ $
					par[6]*(x^2)*y + par[7]*(y^2)*x + par[8]*x^3 + par[9]*y^3

					
end