interpolation models

[Mark Lytle <mlytle0 sbcglobal net>]

Hello all,

I now have interpolation working on Gnumeric and it is giving reasonable numbers, but it seems to only have 
linear interpolation available.  The command accepts the '0' parameter, or no parameter, consistent with 
linear, but any other values 1 through 5 for the other models gives an error.

Anyone have any suggestions?

Thank you,

Mark Lytle