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https://issues.apache.org/jira/browse/MATH-1284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14972900#comment-14972900
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Gilles commented on MATH-1284:
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Defining "vector" in terms of two "point"s makes it obvious, indeed. Unless...
the first point is the "origin".
I think that it is important to show what will go wrong when we wish to
implement some geometrical concepts.
Perhaps it would be useful to start a discussion on the "dev" ML.
A proposal would be to just remove the {{Point}} interface, if what is
currently implemented in CM only needs the "vector" concept.
> 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.
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