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Date: Tue, 9 Feb 2010 17:59:28 +0000 (UTC)
From: "Roger BAll (JIRA)" <jira@apache.org>
To: issues@commons.apache.org
Subject: [jira] Commented: (MATH-341) Test for firsst Derivative in
 PolynomialFunction ERROR
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    [ https://issues.apache.org/jira/browse/MATH-341?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12831561#action_12831561 ] 

Roger BAll commented on MATH-341:
---------------------------------

Regarding: 
"So I think there is only a documentation problem: we should warn the user about extracting coefficients in this implementation.

Do you agree with this analysis ?"

Certainly a documentation problem. However, if the coefficients do not result in a curve expression that is valid of the entire range of values for which the curve expression is derived then the curve expression is not really useful in a practical sense. I also the erractic occillations in curve. These occillations are HUGE when comparred to the data. Therefore the expression is not all together valid.

> Test for firsst Derivative in PolynomialFunction ERROR
> ------------------------------------------------------
>
>                 Key: MATH-341
>                 URL: https://issues.apache.org/jira/browse/MATH-341
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 2.0
>            Reporter: Roger BAll
>         Attachments: FirstDerivativePolyNomTest.java
>
>
> I have written the attached test using our data for generating a curve function
> However the first derivative test fails see: testfirstDerivativeComparisonFullPower
> Either my test is in error or there is a bug in PolynomialFunction class.
> Roger Ball
> Creoss Business Solutions 

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