Measurement Studio for VB6

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4 Point Calibration - I need help.

So this doesn't use Measurement Studio but I am dealing with VB.

I have a system that the original author used four points to 'calibrate' a system.  His code is not even remotely what you would call calibration.  The four known points, however, tell me that the system has nothing perpendicular nor parallel.

Using four known points, what are the equations to back-track to an origin and calibrate this thing?  It is an X-Y plane, no Z dimension involved.

The last time I needed to do this kind of math Ronald Reagan was the President.

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In the absence of any theoretical model, maybe you can fit to a polynomial?

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