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https://issues.apache.org/jira/browse/MATH-545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13005609#comment-13005609
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Gilles commented on MATH-545:
-----------------------------
Shall we add "cosine" to the "RealVector" interface?
And the implementation would go in "AbstractRealVector":
{noformat}
public double cosine(RealVector v) {
final double norm = getNorm();
final double vNorm = v.getNorm();
if (norm == 0 || vNorm == 0) {
throw new MathArithmeticException(LocalizedFormats.ZERO_NORM);
}
return dotProduct(v) / (norm * vNorm);
}
{noformat}
> Feature Request: RealVector cosine
> ----------------------------------
>
> Key: MATH-545
> URL: https://issues.apache.org/jira/browse/MATH-545
> Project: Commons Math
> Issue Type: New Feature
> Reporter: Benjamin McCann
>
> I'd like a method to compute the cosine similarity between vectors.
> http://en.wikipedia.org/wiki/Cosine_similarity
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