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https://issues.apache.org/jira/browse/MATH-341?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12831750#action_12831750
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Luc Maisonobe commented on MATH-341:
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You select the points yourself as you provides the x and y arrays, so yes, you
can choos points at Chebyshev abscissas.
The array even don't need to be sorted. However, you cannot have two points
with the same x value.
> 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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