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_class='hudson.plugins.git.GitChangeSet'><affectedPath>calc_roots.F90</affectedPath><commitId>76464de9f694cb3148b0ae07f9eb0098afc4a4e4</commitId><timestamp>1791911400000</timestamp><author><absoluteUrl>https://carson.math.uwm.edu/jenkins/user/noreply</absoluteUrl><fullName>noreply</fullName></author><authorEmail>noreply@github.com</authorEmail><comment>Fixed bug in cubic equation solve function. Only relevant if pdf is L… (#1387)

* Fixed bug in cubic equation solve function. Only relevant if pdf is Luhar or iiPDF_type=4

Therefore technically BIT_CHANGING...
The bug existed because the old code used the principal cube root
which has an imaginary part for negative bases.
The fix is to simply calc: -|w|**(1/3) for negative real numbers.

* Replaced determinant with discriminant

Verified via a new Fortran unit test and also manually checked with wolfram alpha.
There is no way to actually run this code :/
would only work for iiPDF_types: iiPDF_3D_Luhar = 3 and iiPDF_3D_Luhar = 3
(and those are currently (Oct 2026) broken )
</comment><date>2026-10-13 12:10:00 -0500</date><id>76464de9f694cb3148b0ae07f9eb0098afc4a4e4</id><msg>Fixed bug in cubic equation solve function. Only relevant if pdf is L… (#1387)</msg><path><editType>edit</editType><file>calc_roots.F90</file></path></item><kind>git</kind></changeSet><culprit><absoluteUrl>https://carson.math.uwm.edu/jenkins/user/noreply</absoluteUrl><fullName>noreply</fullName></culprit><inProgress>false</inProgress><nextBuild><number>521</number><url>https://carson.math.uwm.edu/jenkins/job/sam_clubb_nvhpc_build/521/</url></nextBuild><previousBuild><number>519</number><url>https://carson.math.uwm.edu/jenkins/job/sam_clubb_nvhpc_build/519/</url></previousBuild></workflowRun>