[Octave-bug-tracker] [bug #36732] interp1 does not check input for monotonicity

[Carnë Draug]

Follow-up Comment #17, bug #36732 (project octave):

The following was a comment by Francesco Potortì by e-mail:

As far as I know, Matlab requires strictly monotonic values for X.  The bug
report claims that an error is generated in Matlab for

interp1([1:5 4:9], 1:11, 4)


Please, could someone with access to Matlab check whether this one generates
an error too?

interp1([1:5 3.5:9], 1:11, 4)

In this second test case X contains all distinct values, but they are
non-monotonic.

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