I have to two questions about the accuracy of fit result.
- How to set the accuracy of the fit parameters.(The plot is here)
For example. the parameter p0 is at the level of 1e-8, I think the result in the pad is not precise enough for my work.
- How to set the accuracy of parameters in Fit-box.
Is it right by
To obtain more accurate result, waht can be represented the string “6.4g” ?
"%6.4g" gives 4 most significant decimal digits precision.
You could try (printing format for fit parameters in the stat box):
In the screenshot, all values of parameters and their errors are given with 6 most significant decimal digits precision.
The “p0” is around
5e-8, and its error is around
4e-9, so it’s around 8% (i.e., just 1 order of magnitude smaller than the value itself, and you get them both with 6 digits).
You can print this value with more digits, e.g.:
printf("p0 = %24.17g +- %24.17g\n", your_fit_function->GetParameter(0), your_fit_function->GetParError(0));
Thanks a lot.
It solved my problems.
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