commons-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Gilles (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-1284) Vector is-not-a Point
Date Sat, 24 Oct 2015 20:49:27 GMT

    [ https://issues.apache.org/jira/browse/MATH-1284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14972850#comment-14972850
] 

Gilles commented on MATH-1284:
------------------------------

I think that {{Point}} here is just meant to be a base class of {{Vector}}.
It is perhaps imprecise, mathematically. 
Does a "point" actually need a "distance" to exist?  If "distance" is defined in this class,
then isn't it equivalent to a "vector"?
Perhaps Luc could clarify his choice of terms within the Javadoc.
What would you suggest?


> Vector is-not-a Point
> ---------------------
>
>                 Key: MATH-1284
>                 URL: https://issues.apache.org/jira/browse/MATH-1284
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 3.5
>            Reporter: Roman Werpachowski
>            Priority: Minor
>
> The class hierarchy for geometry claims that Vector is-a Point: https://commons.apache.org/proper/commons-math/apidocs/org/apache/commons/math3/geometry/Point.html
> This is mathematically incorrect, see e.g. http://math.stackexchange.com/a/645827
> Just because they share the same numerical representation, Point and Vector shouldn't
be crammed into a common class hierarchy.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message