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https://issues.apache.org/jira/browse/NUMBERS-143?focusedWorklogId=409121&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-409121
]
ASF GitHub Bot logged work on NUMBERS-143:
------------------------------------------
Author: ASF GitHub Bot
Created on: 24/Mar/20 22:01
Start Date: 24/Mar/20 22:01
Worklog Time Spent: 10m
Work Description: coveralls commented on issue #76: NUMBERS-143: Added
specialised hypot function to Complex.
URL: https://github.com/apache/commons-numbers/pull/76#issuecomment-586772181
[](https://coveralls.io/builds/29592522)
Coverage increased (+0.02%) to 98.41% when pulling
**e035b2ee08f0c06b7022c48c26618966740213fa on aherbert:numbers-143-feature**
into **817cb6d4c8ec6afdfed94e9d5e8bbd50e0b9f9db on apache:master**.
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Issue Time Tracking
-------------------
Worklog Id: (was: 409121)
Time Spent: 0.5h (was: 20m)
> Investigate Math.hypot for computing the absolute of a complex number
> ---------------------------------------------------------------------
>
> Key: NUMBERS-143
> URL: https://issues.apache.org/jira/browse/NUMBERS-143
> Project: Commons Numbers
> Issue Type: Task
> Components: complex
> Reporter: Alex Herbert
> Priority: Minor
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> {{Math.hypot}} computes the value {{sqrt(x^2+y^2)}} to within 1 ULP. The
> function uses the [e_hypot.c|https://www.netlib.org/fdlibm/e_hypot.c]
> implementation from the Freely Distributable Math Library (fdlibm).
> Pre-java 9 this function used JNI to call an external implementation. The
> performance was slow. Java 9 ported the function to native java (see
> [JDK-7130085 : Port fdlibm hypot to
> Java|https://bugs.java.com/bugdatabase/view_bug.do?bug_id=7130085]).
> This function is used to define the absolute value of a complex number. It is
> also used in sqrt() and log(). This ticket is to investigate the performance
> and accuracy of \{{Math.hypot}} against alternatives for use in Complex.
>
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