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Parameters are usually double precision (good). But when starting a fit, or re-starting a fit from the Fit Function pane to do more iterations, the values requested for the initial evaluation seem to be rounded to fewer decimal places than are seen in the dialog.
At the moment the rounding error is smaller than the errors of the fit, but that may not always be the case especially with sharp peaks centred at large X values or high frequency oscillations.. It may be the reason why sometimes if a fit converges nicely (even with built in simple functions) and then I press "fit" again it gives slightly different numbers each time.
The text was updated successfully, but these errors were encountered:
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Feb 22, 2021
Parameters are usually double precision (good). But when starting a fit, or re-starting a fit from the Fit Function pane to do more iterations, the values requested for the initial evaluation seem to be rounded to fewer decimal places than are seen in the dialog.
At the moment the rounding error is smaller than the errors of the fit, but that may not always be the case especially with sharp peaks centred at large X values or high frequency oscillations.. It may be the reason why sometimes if a fit converges nicely (even with built in simple functions) and then I press "fit" again it gives slightly different numbers each time.
The text was updated successfully, but these errors were encountered: