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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. ax
d3=: (%. 1&,.)~ a and b such that y is approx. ax + b
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