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From "Gilles (JIRA)" <>
Subject [jira] [Commented] (MATH-1471) BicubicInterpolatingFunction not interpolating correctly for non discrete y value
Date Fri, 12 Oct 2018 23:36:00 GMT


Gilles commented on MATH-1471:

{quote}I have also attached the unit tests to this issue.
What you have attached is an archive of your copy of the repository, plus your compiled files
and the generated web site. :(
 Please upload a patch file.
{quote}The pull request has been made
Where is it (I didn't get any notification)?
 Alternatively to the patch file, please copy here the link to the pull request. Thanks.

> BicubicInterpolatingFunction not interpolating correctly for non discrete y value
> ---------------------------------------------------------------------------------
>                 Key: MATH-1471
>                 URL:
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 3.6.1
>         Environment: JDK 1.8.0_181 
>            Reporter: Tom
>            Priority: Major
>         Attachments:
> 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) =
> 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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