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Gilles commented on MATH-1414: ------------------------------ Please open a report on https://issues.apache.org/jira/browse/NUMBERS since this {{Complex}} class will likely be deprecated in favour of its equivalent in "Commons Numbers". > 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 method reciprocal() returns INF only if the real and > imaginary parts are exactly equal to 0.0. In the cases when real and > imaginary parts are double numbers very close to 0.0, it does not hold. For > example, if we run this code > {code} > Complex complex0 = new Complex((-2.44242319E-315)); > Complex complex1 = complex0.reciprocal(); > {code} > 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 > {code} > if (real == 0.0 && imaginary == 0.0) { > return INF; > } > {code} > should be replaced by the equality check with some tolerance (0.01 in this > case): > {code} > if (equals(this, ZERO, 0.01)) { > return INF; > } > {code} -- This message was sent by Atlassian JIRA (v6.3.15#6346)