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A question of Fit


I'd like to fit data of two independent variables, similar to the typical

Fit[data, {1, x, y, TBD}, {x, y}]

(data of the form      {{x1, y1, z1}, {x2, y2, z2}, ..., {xn, yn,
     )

I have enough knowledge of the data to state that

z [x, 0]  = = x

Is there a way to force a fitted function to pass through the known points
at y = = 0?


Thanks,

James Richitt




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