Opened 14 years ago
Closed 13 years ago
#157 closed bug (fixed)
Power law extrapolation in invariant fails
Reported by: | dpozzo@… | Owned by: | srkline |
---|---|---|---|
Priority: | major | Milestone: | Analysis Wish List |
Component: | Analysis | Keywords: | |
Cc: | Blocking: | ||
Task: |
Description
The power law exrapolation to zero Q in the calculation of the invariant is failing. I get a good fit to the data but the integration process fails because returning NaN for the low Q invariant.
Danilo
Change History (2)
comment:1 Changed 14 years ago by srkline
- Milestone set to Analysis Wish List
comment:2 Changed 13 years ago by srkline
- Resolution set to fixed
- Status changed from new to closed
The extrapolated q-values started at zero, which caused the power-law to return INF, and the invariant integration, NaN. Qmin has been reset to Qmin = 1e-5. Guinier extrapolations do not have the problem, nor do highQ extrapolations.
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Is there a minimum slope necessary for convergence? If so, it could (must) be enforced during the curve fitting.