Thomas Swinicki created MATH-1471:
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Summary: 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: Thomas Swinicki
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.
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