Alex Herbert created NUMBERS-143:
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Summary: 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
{{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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