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https://issues.apache.org/jira/browse/MATH-1549?focusedWorklogId=460042&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-460042
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ASF GitHub Bot logged work on MATH-1549:
----------------------------------------
Author: ASF GitHub Bot
Created on: 17/Jul/20 01:19
Start Date: 17/Jul/20 01:19
Worklog Time Spent: 10m
Work Description: coveralls commented on pull request #155:
URL: https://github.com/apache/commons-math/pull/155#issuecomment-659771586
[](https://coveralls.io/builds/32131281)
Coverage increased (+0.01%) to 90.954% when pulling
**84890c9409d4a501de68c7512baaf69826e71ddb on mohrezaei:master** into
**4108f5f35e22db3401a11fbbf93f85be21394f5c on apache:master**.
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Issue Time Tracking
-------------------
Worklog Id: (was: 460042)
Time Spent: 20m (was: 10m)
> Simplex solver report unbounded solution when solvable constraints scaling up
> -----------------------------------------------------------------------------
>
> Key: MATH-1549
> URL: https://issues.apache.org/jira/browse/MATH-1549
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 3.6.1
> Environment: macOS catalina
> Reporter: Fan Zhang
> Priority: Major
> Attachments: CommonsMathSimplexSolverTest.java
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> *scenario 1:*
> {code:java}
> min: x + y
> x, y >= 0
> 9000x + y >= 0
> 10000x + y >= 2000
> x >= 2{code}
> *scenario 2:*
> {code:java}
> min: x + y
> x, y >= 0
> 9.0E15x + 1.0E12y >= 0
> 1.1e16x + 1.0e12y >= 2.0e15
> 1.0e12x >= 2e12{code}
> for scenario 1, it works out. but for scenario 2 whose constrains are just
> scaled up by 1e12, the solver reports unbounded solution.
>
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