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Date: Sun, 5 Oct 2014 18:43:34 +0000 (UTC)
From: "Phil Steitz (JIRA)" <jira@apache.org>
To: issues@commons.apache.org
Message-ID: <JIRA.12722765.1403267252000.193807.1412534614149@Atlassian.JIRA>
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Subject: [jira] [Closed] (MATH-1130) A new set of functions for copyof,
 remove and replace a given value on a slice of array
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     [ https://issues.apache.org/jira/browse/MATH-1130?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Phil Steitz closed MATH-1130.
-----------------------------
    Resolution: Not a Problem

Per discussion on this ticket and the mailing list, there is no immediate need for these methods.

> A new set of functions for copyof, remove and replace a given value on a slice of array
> ---------------------------------------------------------------------------------------
>
>                 Key: MATH-1130
>                 URL: https://issues.apache.org/jira/browse/MATH-1130
>             Project: Commons Math
>          Issue Type: New Feature
>    Affects Versions: 3.4
>            Reporter: Venkatesha Murthy TS
>         Attachments: equalsIncludingNaN.dat, math-1130-checknotnan.patch, math-1130-precision-equals.patch, math-1130-remove.patch, math-1130-replace.patch
>
>
> These are utility functions mostly required as part of MathArrays.
> MathArrays:
> =============
> The requirement is as follows:
> a) double[] copyOf(double[] values, int begin, int length) ;
> Similar to most other functions that support slice defined  by  the array part from [begin, begin+length) ;its a requirement to copy a slice which is not available (the closest is copyOf(array, int len) which misses out the begin index)
> b) double[] removeAll(double[] values, int begin, int length, double removable);
> Need a function to remove a value from array slice defined by [begin,begin+length) and return the filtered version.
> c) double[] replaceAll(double[] values, int begin, int length, double oldValue, double newValue);
> Need a function to replace inplace an oldValue substituted with newValue in the array slice defined by [begin,begin+length) and return the original  complete array with just replaced values only in the segment [begin,begin+length)
> MathUtils
> =========
> boolean canEqual(double d1, double d2) ;
> provide a canEqual function that is slightly better than exisitng MathUtils.equals. We could also improve existing equals method however.
> So the change here is that the new enhanced canEqual can do a quick check on Nans  and then move to a detailed Double.compare(..) method. This avoids the Double.compare call when any one of them is NaN.


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