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Interpolate 2D on irregular grid


I have data

d={{x1,y1,f1},{x2,y2,f2},...}

The {xi, yi} are NOT on a regular grid, and Interpolation[d} returns
an error message.

I have an old version of Mathematica.  Is Interpolation improved in a
newer version?  Or can anyone point me to a package which handles this
case?

Thank you
David Golber



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