[jira] [Created] (MATH-1289) Incorrect calculation in org.apache.commons.math3.complex.Complex#multiply

["Detaille Octave (JIRA)" <ji...@apache.org>]

Detaille Octave created MATH-1289:
-------------------------------------

             Summary: Incorrect calculation in org.apache.commons.math3.complex.Complex#multiply
                 Key: MATH-1289
                 URL: https://issues.apache.org/jira/browse/MATH-1289
             Project: Commons Math
          Issue Type: Bug
    Affects Versions: 3.5
         Environment: Linux 3.16.0-44-generic #59-Ubuntu SMP Tue Jul 7 02:07:39 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

java version "1.8.0_45"
Java(TM) SE Runtime Environment (build 1.8.0_45-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)
            Reporter: Detaille Octave


Hello guys!

If think there is a bug in the org.apache.commons.math3.complex.Complex#multiply method

Line 536 & 537 below are not correct
{code:title=Complex.java|borderStyle=solid}
return createComplex(real * factor.real - imaginary * factor.imaginary, real * factor.imaginary + imaginary * factor.real);
{code}
It should be
{code:title=Complex.java|borderStyle=solid}
return createComplex(real * factor.real + imaginary * factor.imaginary, imaginary * factor.real-real * factor.imaginary);
{code}
Can you confirm that? Or do I miss something?
Thanks a lot (also, for this excellent library).

Best,
Octave



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