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Posted to issues@commons.apache.org by "Benjamin McCann (JIRA)" <ji...@apache.org> on 2011/03/11 06:52:59 UTC
[jira] Created: (MATH-545) Feature Request: RealVector cosine
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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[jira] Resolved: (MATH-545) Feature Request: RealVector cosine
Posted by "Gilles (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MATH-545?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Gilles resolved MATH-545.
-------------------------
Resolution: Fixed
Fix Version/s: 3.0
Method "cosine" added in "RealVector" interface (revision 1082442).
> 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
> Assignee: Gilles
> Fix For: 3.0
>
>
> I'd like a method to compute the cosine similarity between vectors.
> http://en.wikipedia.org/wiki/Cosine_similarity
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[jira] Issue Comment Edited: (MATH-545) Feature Request: RealVector
cosine
Posted by "Benjamin McCann (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MATH-545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13005517#comment-13005517 ]
Benjamin McCann edited comment on MATH-545 at 3/11/11 6:36 AM:
---------------------------------------------------------------
I guess it's pretty simple, but it still might be nice as a convenience method:
{noformat}
public double cosine(double[] a1, double[] a2) {
ArrayRealVector v1 = new ArrayRealVector(a1);
ArrayRealVector v2 = new ArrayRealVector(a2);
return v1.dotProduct(v2) / (v1.getNorm() * v2.getNorm());
}
{noformat}
was (Author: bmccann):
I guess it's pretty simple, but it still might be nice as a convenience method:
public double cosine(double[] a1, double[] a2) {
ArrayRealVector v1 = new ArrayRealVector(a1);
ArrayRealVector v2 = new ArrayRealVector(a2);
return v1.dotProduct(v2) / (v1.getNorm() * v2.getNorm());
}
> 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
--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] Issue Comment Edited: (MATH-545) Feature Request: RealVector
cosine
Posted by "Benjamin McCann (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MATH-545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13005517#comment-13005517 ]
Benjamin McCann edited comment on MATH-545 at 3/11/11 6:33 AM:
---------------------------------------------------------------
I guess it's pretty simple, but it still might be nice as a convenience method:
public double cosine(double[] a1, double[] a2) {
ArrayRealVector v1 = new ArrayRealVector(a1);
ArrayRealVector v2 = new ArrayRealVector(a2);
return v1.dotProduct(v2) / (v1.getNorm() * v2.getNorm());
}
was (Author: bmccann):
I guess it's pretty simple, but it still might be nice as a convenience method:
public double cosine(double[] a1, double[] a2) {
ArrayRealVector v1 = new ArrayRealVector(a1);
ArrayRealVector v2 = new ArrayRealVector(a2);
return v1.dotProduct(v2) / (v1.getNorm() * v2.getNorm());
}
> 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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For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] Commented: (MATH-545) Feature Request: RealVector cosine
Posted by "Gilles (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MATH-545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13005609#comment-13005609 ]
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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For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] Commented: (MATH-545) Feature Request: RealVector cosine
Posted by "Benjamin McCann (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MATH-545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13005517#comment-13005517 ]
Benjamin McCann commented on MATH-545:
--------------------------------------
I guess it's pretty simple, but it still might be nice as a convenience method:
public double cosine(double[] a1, double[] a2) {
ArrayRealVector v1 = new ArrayRealVector(a1);
ArrayRealVector v2 = new ArrayRealVector(a2);
return v1.dotProduct(v2) / (v1.getNorm() * v2.getNorm());
}
> 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
--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira