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https://issues.apache.org/jira/browse/MATH-215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12659423#action_12659423
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Bernhard Grünewaldt commented on MATH-215:
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Still todo is the inverse version:
http://fourier.eng.hmc.edu/e161/lectures/wht/node2.html
I will do that in February since I have my exams in January and therefore no
time for programming.
It's nice that the code was committed so fast to the repository. All thanks to
Luc :)
> Fast Hadamard Transform
> -----------------------
>
> Key: MATH-215
> URL: https://issues.apache.org/jira/browse/MATH-215
> Project: Commons Math
> Issue Type: New Feature
> Affects Versions: 1.0, 1.1, 1.2
> Reporter: Daniel Kuan
> Assignee: Luc Maisonobe
> Fix For: 2.0
>
> Attachments: FastHadamardTransformer.java.diff,
> FastHadamardTransformerTest.java.diff
>
>
> To date, the mathematical transforms package of Commons Maths,
> org.apache.commons.math.transform, only contains implementations for the
> Fourier, Sine, and Cosine transforms.
> This issue serves to propose and track the creation of an implementation for
> the Hadamard transform.
> Definition of the hadamard transform:
> http://en.wikipedia.org/wiki/Hadamard_transform#Definition
> Unfortunately, Mathworld does not provide a very detailed definition.
> http://mathworld.wolfram.com/HadamardTransform.html
> An elegant algorithm for the fast hadamard transform can be found here:
> http://www.archive.chipcenter.com/dsp/DSP000517F1.html
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