[Numpy-discussion] suggested change of behavior for interp

Charles R Harris charlesr.harris at gmail.com
Tue Jun 4 20:05:24 EDT 2013

On Tue, Jun 4, 2013 at 12:07 PM, Slavin, Jonathan
<jslavin at cfa.harvard.edu>wrote:

> Hi,
> I would like to suggest that the behavior of numpy.interp be changed
> regarding treatment of situations in which the x-coordinates are not
> monotonically increasing.  Specifically, it seems to me that interp should
> work correctly when the x-coordinate is decreasing monotonically.  Clearly
> it cannot work if the x-coordinate is not monotonic, but in that case it
> should raise an exception.  Currently if x is not increasing it simply
> silently fails, providing incorrect values.  This fix could be as simple as
> a monotonicity test and inversion if necessary (plus a raise statement for
> non-monotonic cases).
Seems reasonable, although it might add a bit of execution time.


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