Is someone working on 2d interpolation?

[Brian Gough]

=?ISO-8859-15?Q?Achim_G=E4dke?= writes:
 > For graphical evaluation, I need to interpolate these values. 
 > Furthermore I plot isolines for H. I've already implemented an 
 > interpolation formula for rectangular sample values (0,0), 
 > (0,1),(1,0),(1,1) . Inside this square I use the interpolation
 > H=a*x+b*y+c*x*y+d with a=H(1,0)-H(0,0), b=H(0,1)-H(0,0), 
 > c=H(1,1)+H(0,0)-H(0,1)-H(1,0), d=H(0,0)
 > This results in a continuous surface with hyperbola isolines.
 > 
 > But I'd like to have a smoother solution. Is anyone working on such code?

Not to my knowledge.  I think there must be some GPL or public domain
contour plotting rouines availble somewhere though.

Brian