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mutivariable interpolation functions

• To: mathgroup at smc.vnet.net
• Subject: [mg29152] mutivariable interpolation functions
• From: adam_jurhs at xontech.com (atjurhs)
• Date: Wed, 30 May 2001 23:28:38 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Essentially, I have a list of a list of a list (data in three dimensions) 
and I want to be able to create an interpolation function (surface) for 
the data, so that later on I can calculate derivatives over the surface 
and that sort of stuff.  The built-in ListInterpolation function seems to 
be working fine (so I think), but working with the resulting interpolated
function of three variables seems to be where I'm stuck.  I don't know how
to compute the derivatives along anyone of the axis (or the gradient) 
because I don't know what variables the ListInterpolation function utilized.
I can email the Mathematica notebook to anyone who would be willing to help.