On 5 Jun 2013 03:21, "Eric Firing" <efir...@hawaii.edu> wrote: > > On 2013/06/04 4:15 PM, Benjamin Root wrote: > > Could non-monotonicity be detected as part of the interp process? > > Perhaps a sign switch in the deltas? > > There are two code paths, depending on the number of points to be > interpolated. When it is greater than the size of the table, the deltas > are pre-computed in a single sweep. Non-monotonicity could be detected > there at moderate cost. In the other code path, for a smaller number of > points, the deltas are computed only as needed, so monotonicity testing > would require a separate sweep through the points. That's the costly > case that I think might reasonably be an option but that should not be > required.
Nonetheless, perhaps the function should at least be safe by default? I'm worried by these multiple reports of people silently getting wrong answers in practice... -n
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