[Octave-bug-tracker] [bug #42686] interp1 returns NAs in simple cases where 0 expected

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?42686>

                 Summary: interp1 returns NAs in simple cases where 0 expected
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Sat 05 Jul 2014 05:45:05 AM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: Julius Smith
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.6.4
        Operating System: Mac OS

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Details:

To reproduce:


> interp1([1 2],[0 0],[1.1 2.1])
ans =

     0    NA
> interp1([1 2],[0 0],[1.1 1.9])
ans =

   0   0


This example was simplified from a much larger example for which Y started out
with zeros and then became nonzero.  Perhaps something singular happens when
the leading given samples are zero?  Note that it seems to be well behaved
when the interpolated indices are interior to the given indices.





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