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Find a function that fits two dimensional data


hi!

Could somebody help me find a function that fits some two dimensional
data that I have..the data is of the form {x,y,f(x,y)} and so far the
function aa/(bb+cc Exp[-dd xy]) (where aa,bb,cc,dd are constants) seems
to fit the data best but it is not quite accurate fit. I have used
findfit to find this function. Is there a better way to find an exact
function or should I keep experimenting? :-)

Thanks,

Raj


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