You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@commons.apache.org by "Phil Steitz (JIRA)" <ji...@apache.org> on 2014/10/05 20:43:34 UTC
[jira] [Closed] (MATH-1130) A new set of functions for copyof,
remove and replace a given value on a slice of array
[ 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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)