[Octave-bug-tracker] [bug #44002] The "extrap" option does not work in interp3 function.

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?44002>

                 Summary: The "extrap" option does not work in interp3
function.
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Wed 14 Jan 2015 01:18:49 PM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
             Assigned to: None
         Originator Name: Edwin de Koning
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.8.2
        Operating System: Microsoft Windows

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Details:

The interp3 function searches for values in a pre-defined list. It has an
option to extrapolate the values outside of this list (this is actually the
default Matlab behaviour). However, when this option is used, an error is
given.

Example:
>> X=[0,0.5,1]; Y=X; Z=X;
>> V=rand(3,3,3);
>> x=[-0.1,0,0.1]; y=x; z=x;
>> interp3(X,Y,Z,V,x,y,z,"spline")
ans =

        NA
   0.26611
   0.26838

(In this case, the default Octave behaviour is to return an "NA" for every
outlier. However, I would like to extrapolate the values via the "extrap"
option).

>> interp3(X,Y,Z,V,x,y,z,"spline","extrap")
error: interp3: wrong number or incorrectly formatted input arguments
error: called from:
error:   C:\Octave\Octave-3.8.2\share\octave\3.8.2\m\general\interp3.m a
t line 134, column 5
>>

Octave does not accept the "extrap" option in the interp3 function.






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