limitation of exponential Assembly

Hello

I have some difficulty tio adjust an exponential curve. For example: linear VI, Exp and mounting of power (in labview\examples\math\curvefit.llb) and parameters:

-number of points: 3000

r: 1E-9

b:-0.0006

-c: 1

- and no noise

The results are not really what I expected. No idea why it does not work or what other solution could be used?

Thanks in advance

EXT on 18-21 decimal digits (mantissa is 64-bit) Windows, will not give you 34 as falsely claimed above. This will really help you save if rewrite you anything that is used within the hierarchy of the whole fitting. Even if you do, there will be limits.

The real problem is that your data causes internal matrices become ill-conditioned. The condition number is greater than 1E19, making it impossible to determine improved parameters. (Because you'd lose > 19 digits of precision, same EXT is not sufficient).

You need to scale your data in a range more resonable, then transform found adjustment parameters for the original values. For example, if you set c = 0 in the adjustment and also to change the condition of termination to a much smaller value (e.g., tolerance = 1e-14), successor to the adjustment.

If you have real data, subtract a constant adapted according to the data for editing (for example, the value of the last item), then add it to the C found later.

Tags: NI Software

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