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Posted to issues@commons.apache.org by "Virendra Singh (JIRA)" <ji...@apache.org> on 2019/06/19 17:47:00 UTC
[jira] [Issue Comment Deleted] (MATH-1490) Percentile computational
accuracy issue
[ https://issues.apache.org/jira/browse/MATH-1490?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Virendra Singh updated MATH-1490:
---------------------------------
Comment: was deleted
(was: Hi [~lingchao], I looked into your issue, I checked it on version 2.2 & 3.6 with your Test case. I found that version 2.2 gives the Percentile value = *7.55* while the version 3.6 gives the Percentile value = *7.550000000000001*(for this particular test case).
It can be solved if you add delta/tolerance *1e-15* in assertEquals(expected,actual,delta) method.)
> Percentile computational accuracy issue
> ---------------------------------------
>
> Key: MATH-1490
> URL: https://issues.apache.org/jira/browse/MATH-1490
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 3.4, 3.4.1, 3.5, 3.6, 3.6.1
> Environment: System: Linux testinglab 4.4.0-131-generic #157~14.04.1-Ubuntu
> Java version "1.8.0_191"
> Java(TM) SE Runtime Environment (build 1.8.0_191-b12)
> Java HotSpot(TM) 64-Bit Server VM (build 25.191-b12, mixed mode)
>
>
> Reporter: Lingchao Chen
> Priority: Major
> Labels: performance
> Attachments: BugDemo.java
>
>
> The percentile method works well on the older versions, e.g., the version before 3.4. However, when I update commons-math to the newer version, there produces a computational accuracy issue. There is a backward compatibility bug behind it.
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