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Posted to issues@commons.apache.org by "Gilles (JIRA)" <ji...@apache.org> on 2011/04/22 11:52:05 UTC

[jira] [Created] (MATH-561) Analogous to "normalizeAngle" in "MathUtils"

Analogous to "normalizeAngle" in "MathUtils"
--------------------------------------------

                 Key: MATH-561
                 URL: https://issues.apache.org/jira/browse/MATH-561
             Project: Commons Math
          Issue Type: Wish
            Reporter: Gilles
            Assignee: Gilles
            Priority: Minor
             Fix For: 3.0


I'd like to create a "reduce" method in "MathUtils", similar to "normalizeAngle" but more general:
{code}
/**
 * Reduce to the primary interval {@code [offset offset+period)}.
 *
 * @param a Value to reduce.
 * @param period Period.
 * @param offset Offset.
 */
public static double reduce(double a,
                            double period,
                            double offset) {
    return a - period * FastMath.floor((a - offset) / period);
}
{code}
Thus the "period" parameter the is not fixed to 2&pi;, as is the case in "normalizeAngle".


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[jira] [Resolved] (MATH-561) Analogous to "normalizeAngle" in "MathUtils"

Posted by "Gilles (JIRA)" <ji...@apache.org>.

     [ https://issues.apache.org/jira/browse/MATH-561?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gilles resolved MATH-561.
-------------------------

    Resolution: Fixed

Revision 1097088.
[The image interval is actually [0, period); not [offset, period+offset), as first proposed.]


> Analogous to "normalizeAngle" in "MathUtils"
> --------------------------------------------
>
>                 Key: MATH-561
>                 URL: https://issues.apache.org/jira/browse/MATH-561
>             Project: Commons Math
>          Issue Type: Wish
>            Reporter: Gilles
>            Assignee: Gilles
>            Priority: Minor
>             Fix For: 3.0
>
>
> I'd like to create a "reduce" method in "MathUtils", similar to "normalizeAngle" but more general:
> {code}
> /**
>  * Reduce to the primary interval {@code [offset offset+period)}.
>  *
>  * @param a Value to reduce.
>  * @param period Period.
>  * @param offset Offset.
>  */
> public static double reduce(double a,
>                             double period,
>                             double offset) {
>     return a - period * FastMath.floor((a - offset) / period);
> }
> {code}
> Thus the "period" parameter the is not fixed to 2&pi;, as is the case in "normalizeAngle".

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