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

[Vivek]

Follow-up Comment #15, bug #36732 (project octave):

I guess, there is no need for strictly monotonicity. 
What should be strictly monotonic? X or Y? 

See, putting a restriction over X being strictly monotonic doesn't make sense,
it is the relation between X and Y that matters. The relation can be many to
one or one to one but not many to one. i.e. only restriction should be that
values of X have to be distinct. 

Because I can always rearrange the order of X-values and correspondingly
Y-values will change. 

There is no need for function to be strictly monotonic (sin(X)?)


I guess we should relax strictly monotonicity, only restriction should be that
X should have distinct values.

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