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IDProjectCategoryView StatusDate SubmittedLast Update
0000307JATpublic2010-10-04 21:512010-10-13 18:44
Reportersmetcalfe 
Assigned To 
PrioritynormalSeverityminorReproducibilityalways
StatusacknowledgedResolutionopen 
PlatformOSOS Version
Summary0000307: LagrangianInterpolator gives very strange results
DescriptionInterpolation was checked using a modification of Kevin's comparison method.
The LagrangianInterpolator gave very strange results while still passing the regression test.
Additional InformationThe interpolators were moved from ODToolboxIntegrators.java and Propagators.java using copy/paste to consolidate multiple instances of the code. Testing revealed that the LagrangianInterpolator gave very strange results with a test based on Kevin's comparison method yet still passed regression testing. The HermiteInterpolator java unit test tests against known valid results. Currently there are no such java unit tests for either the LinearInterpolator or the LagrangianInterpolator.
TagsNo tags attached.
Increment0
Release0.0
Attached Files? file icon HermiteInterpolator_comparison.m [^] (4,923 bytes) 2010-10-04 22:02

- Relationships

-  Notes
(0002464)
smetcalfe (developer)
2010-10-04 22:05

Using HermiteIterpolator_comparison.m, commenting out line 56 disables the java LagrangianInterpolator so you can see the other methods compared.
(0002497)
abrown (administrator)
2010-10-13 18:23

Look into the error, may want to change over to Hermite anyway.
Lower priority.
(0002498)
abrown (administrator)
2010-10-13 18:44

Look into:
How bad is the error. Create a plot using Kevin's test script.
Is anything using this now? Should ODTBX switch over to the Hermite interpolator anyway?

- Issue History
Date Modified Username Field Change
2010-10-04 21:51 smetcalfe New Issue
2010-10-04 21:51 smetcalfe Increment => 0
2010-10-04 21:51 smetcalfe Release => 0.0
2010-10-04 22:02 smetcalfe File Added: HermiteInterpolator_comparison.m
2010-10-04 22:05 smetcalfe Note Added: 0002464
2010-10-13 18:23 abrown Note Added: 0002497
2010-10-13 18:44 abrown Note Added: 0002498
2010-10-13 18:44 abrown Status new => acknowledged


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