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From "Gilles (JIRA)" <>
Subject [jira] [Created] (NUMBERS-60) Check Javadoc with respect to NaN
Date Fri, 02 Feb 2018 12:15:00 GMT
Gilles created NUMBERS-60:

             Summary: Check Javadoc with respect to NaN
                 Key: NUMBERS-60
             Project: Commons Numbers
          Issue Type: Task
          Components: complex
            Reporter: Gilles
             Fix For: 1.0

See e.g. the doc for method {{negate}}:
 * Returns a {@code Complex} whose value is {@code (-this)}.
 * Returns {@code NaN} if either real or imaginary
 * part of this complex number is {@code Double.NaN}.
 * @return {@code -this}.
public Complex negate() {
    return new Complex(-real, -imaginary);
The "NaN" advertized in the the Javadoc seems to refer to the {{Complex.NaN}} field, but {{negate}}
is able to construct instances for which the contract of method {{equals(Object)}} will be

As a related issue, I would make the {{NaN}} field "private" (and rename it "NAN" to avoid
the CheckStyle warning); users who need to check for (any combination of) NaN should use the
{{isNaN()}} method.

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