Approximation

`d0=: ^.@] ^@(] +/ .* %.) 1:,.[`	Exponential fit of x and y
`d1=: ] (] +/ .* %.) 1: ,. [`	Linear least squares fit of x and y
`d2=: (^@{. , {:)@(^.@]%. 1&,.@[)`	a and b such that y is approx. a^x
`d3=: (%. 1&,.)~`	a and b such that y is approx. ax + b

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