[
https://issues.apache.org/jira/browse/MATH-1284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15980159#comment-15980159
]
Raymond DeCampo commented on MATH-1284:
---------------------------------------
I agree with the issue as reported; from a mathematical POV a vector is not a
point.
>From a CS POV I am having trouble seeing the value that having the interface
>{{Vector}} extending the interface {{Point}} brings. In fact, by having
>{{Vector}} extend {{Point}}, one ends up with a method in your {{Vector}}
>implementation where one is ostensibly calculating the "distance from a vector
>to a point". This isn't really satisfying to me from a mathematical or CS
>perspective. The implementations of the {{Point}} {{distance()}} method in
>{{Vector}} implementations all immediately cast the {{Point}} to a {{Vector}}
>implementation.
I will prepare a branch with a proposal for resolving this issue.
> 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
> Fix For: 4.0
>
>
> 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
(v6.3.15#6346)
