[#MATH-267] Need a digamma function

Commons Math

Need a digamma function

Created: 23/May/09 11:40 PM Updated: 07/Aug/09 09:15 AM

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Component/s:

None

Affects Version/s:

None

Fix Version/s:

2.0

Time Tracking:

Not Specified

File Attachments:

File Name	Date Attached	Attached By	Size
Adds_digamma_function.patch	2009-05-24 04:37 AM	Ted Dunning	5 kB
Adds_trigamma_function,_improves_comments.patch	2009-05-24 06:39 AM	Ted Dunning	6 kB
digamma.tgz	2009-05-23 11:41 PM	Ted Dunning	12 kB

Resolution Date:

25/May/09 01:22 PM

Description

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A mahout summer of code student needed a digamma function with Apache permissions so I wrote one. It includes test cases, correct copyright and seems to work well. I don't know where in commons math this would go so I figured I would post this and ask for advice.

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Work Log

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Repository	Revision	Date	User	Message
ASF	#778091	Sun May 24 06:03:19 UTC 2009	psteitz	Added digamma function. JIRA: ~~MATH-267~~ Contributed by Ted Dunning
				Files Changed
				MODIFY /commons/proper/math/trunk/src/test/org/apache/commons/math/special/GammaTest.java MODIFY /commons/proper/math/trunk/src/site/xdoc/changes.xml MODIFY /commons/proper/math/trunk/src/java/org/apache/commons/math/special/Gamma.java

Repository	Revision	Date	User	Message
ASF	#778416	Mon May 25 13:20:07 UTC 2009	psteitz	Added trigamma, javadoc fixes for digamma. JIRA: ~~MATH-267~~. Patched by Ted Dunning.
				Files Changed
				MODIFY /commons/proper/math/trunk/src/test/org/apache/commons/math/special/GammaTest.java MODIFY /commons/proper/math/trunk/src/java/org/apache/commons/math/special/Gamma.java