Gunel Jahangirova created MATH-1414:
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Summary: Method reciprocal() in Complex for complex numbers with
parts very close to 0.0
Key: MATH-1414
URL: https://issues.apache.org/jira/browse/MATH-1414
Project: Commons Math
Issue Type: Improvement
Reporter: Gunel Jahangirova
Priority: Minor
In class Complex the method reciprocal() returns INF only if the real and
imaginary parts are equal exactly to 0.0. In case of real and imaginary parts,
being double numbers very close to 0.0, it does not hold. For example, if we
run this code
Complex complex0 = new Complex((-2.44242319E-315));
Complex complex1 = complex0.reciprocal();
the value of complex1.getReal() will be -Infinity and the value of
complex1.getImaginary() will be NaN, instead of complex1 being equal to INF.
I think the code in the method
if (real == 0.0 && imaginary == 0.0) {
return INF;
}
should be replaced by the equality check with some tolerance (0.01 in this
case):
if (equals(this, ZERO, 0.01)) {
return INF;
}
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