[Octave-bug-tracker] [bug #31780] interp1 behaviour differs from matlab when using 'spline' option

[Richard Crozier]

URL:
  <http://savannah.gnu.org/bugs/?31780>

                 Summary: interp1 behaviour differs from matlab when using
'spline' option
                 Project: GNU Octave
            Submitted by: crobar
            Submitted on: Sat Dec  4 13:12:42 2010
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.2.3
        Operating System: Microsoft Windows

    _______________________________________________________

Details:

When calling inter1 with the 'spline' method when supplying only two input
points octave returns an error while matlab returns a linear interpolation,
e.g.


x = [1, 2];
y = [2, 3];
xi = 1.3;
interp1(x, y, xi, 'spline')


in octave returns


error: spline: requires at least 3 points


but in matlab R2008a returns


ans = 

    2.3


Apologies if this has already been fixed.





    _______________________________________________________

Reply to this item at:

  <http://savannah.gnu.org/bugs/?31780>

_______________________________________________
  Message sent via/by Savannah
  http://savannah.gnu.org/