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https://issues.apache.org/jira/browse/MATH-1471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16650212#comment-16650212
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Gilles commented on MATH-1471:
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Hi Tom.
It's great that you want to contribute to the project but please read [how to
do it|http://commons.apache.org/proper/commons-math/developers.html] (see
especially the paragraph on using "git") in order to make it easy for us to
apply the necessary changes.
I don't know the steps for generating a PR on Github but if you post on the
["dev" mailing
list|http://commons.apache.org/proper/commons-math/mail-lists.html] asking for
help, I hope that someone can explain them.
{quote}Here is the pull request link!
{quote}
Sorry but it is just a link to a ZIP file (same as you attached here, I guess)
whereas it should only contain a "diff" wrt the "master" branch. In particular,
the provided unit test should be a patch to apply to the [existing test suite
for the class being
tested|https://git1-us-west.apache.org/repos/asf?p=commons-math.git;a=blob;f=src/test/java/org/apache/commons/math4/analysis/interpolation/BicubicInterpolatorTest.java;h=bf3195c2a896ad4969b9b9cfa88687a1010fdfe0;hb=HEAD].
> BicubicInterpolatingFunction not interpolating correctly for non discrete y
> value
> ---------------------------------------------------------------------------------
>
> Key: MATH-1471
> URL: https://issues.apache.org/jira/browse/MATH-1471
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 3.6.1
> Environment: JDK 1.8.0_181
> Reporter: Tom
> Priority: Major
> Attachments: ApacheCommonsMathBiInterpolationTests.zip,
> Interpolate.java, InterpolateTest.java
>
>
> Upon performing a bicubic interpolation with two point (x0, y0) and (x1, y1),
> the returned bicubic interpolating function returned returns the same result
> for variations in the estimated y value.
> For example, my inputs are (20, 20) and (25, 25) with f(20, 20) = 64 and
> f(25, 25) = 6468.
> When I get the bicubic interpolating function for this and vary the estimated
> x, it works fine. For (21, 20), the function returns 730.016. When I input
> (20, 21), the function returns 64, which is f(20, 20). For any y value in
> between 20 and 25, the result is 64. This is the case for any function for
> which the y estimate is different from the value on the points.
> In other instances, it is varying x values that result in the same result
> while varying y estimates seem to work as expected.
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