Ticket #4337 (closed: fixed)

Opened 9 years ago

Last modified 5 years ago

MUON: Improve fitting in CalMuonDeadTime when bad data

Reported by: Anders Markvardsen Owned by: Anders Markvardsen
Priority: critical Milestone: Release 2.0
Component: Mantid Keywords:
Cc: robert.whitley@… Blocked By:
Blocking: Tester: Michael Reuter

Description

From discussion today Sean/Jon/Rob/Anders

When fitting a line to rubbish data currently struggle with obtaining reasonable fit.

Possible options to improve this

  1. Add a new minimizer
  2. Play around with how the standard deviations are calculated
  3. bin the DataFitted WS before doing the fit

Attachments

EMU00019023.nxs​ (1.5 MB) - added by Anders Markvardsen 9 years ago.
Steve deadtime example file

Change History

comment:1 Changed 9 years ago by Anders Markvardsen

Fix to CalMuonDeadTime. Re #4337

Turned out that muon data with count equal to zero have zero errors (at least an EMU dataset). Zero errors are no good when fitting.

Changeset: 79d3ed4acdcadbddd82a9c16dba6cb451b72d9a5

comment:2 Changed 9 years ago by Anders Markvardsen

Small adjustment to CalMuonDeadTiem. Re #4337

Changeset: 0a96987719b16a951671ddb893b33b7e8f5e9bd8

comment:3 Changed 9 years ago by Anders Markvardsen

  • Status changed from new to accepted

Changed 9 years ago by Anders Markvardsen

Steve deadtime example file

comment:4 Changed 9 years ago by Anders Markvardsen

  • Status changed from accepted to verify
  • Resolution set to fixed

To test e.g.

1) load added EMU file (note sometimes attached .nxs files appears to be corrupted, if yes contact me and I will email file)

2) run CalMuonDeadTime which FirstGoodData = 0.2 and LastGoodData = 8.0

3) view the TableWorkspace outputted by this algorithms

4) chance the number LastGoodData to a larger value and hopefully you should find the numbers in the TableWorkspace changes little as a consequence of this

comment:5 Changed 9 years ago by Michael Reuter

  • Status changed from verify to verifying
  • Tester set to Michael Reuter

comment:6 Changed 9 years ago by Michael Reuter

  • Status changed from verifying to closed

Following the prescription provided above, I see the expected behavior.

comment:7 Changed 5 years ago by Stuart Campbell

This ticket has been transferred to github issue ​5184

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