Opened 14 years ago

Closed 14 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

Is there a minimum slope necessary for convergence? If so, it could (must) be enforced during the curve fitting.

comment:2 Changed 14 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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