Ticket #820 (closed: fixed)

Opened 11 years ago

Last modified 5 years ago

FlatBackground can end up subtracting infinity from a spectrum, leading to nans

Reported by: Russell Taylor Owned by: Russell Taylor
Priority: major Milestone: Iteration 19
Component: Keywords:
Cc: Blocked By:
Blocking: Tester:

Description

In the example seen, there was a solitary count in one of the bins within the region being fitted to in FlatBackground. gsl reports the following fit as a success:

The fit succeeded, giving y = -1.#IND + -1.#IND*x, with a Chi2 of -1.#IND

Change History

comment:1 Changed 11 years ago by Russell Taylor

  • Status changed from new to assigned

comment:2 Changed 11 years ago by Russell Taylor

(In [2968]) Modifications to Linear to avoid surprising behaviour if fitting to data where only one point is not zero. Re #820.

comment:3 Changed 11 years ago by Russell Taylor

(In [2969]) Small further adjustment to improve stability. Re #820.

comment:4 Changed 11 years ago by Russell Taylor

  • Status changed from assigned to closed
  • Resolution set to fixed

comment:5 Changed 5 years ago by Stuart Campbell

This ticket has been transferred to github issue ​1668

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