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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
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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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