[Octave-bug-tracker] [bug #65134] griddata: output size inconsistent for vector input interpolation points

[Nicholas Jankowski]

Update of bug#65134 (group octave):

              Item Group:     Undocumented Matlab => Matlab Compatibility   
                  Status:               Confirmed => Patch Submitted        
         Planned Release:                    None => 10.1.0 (current default)
                 Summary: griddata col+row ordered query point inputs do not
expand to grid (undocumented matlab)   => griddata: output size inconsistent
for vector input interpolation points 

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Follow-up Comment #8:

attached is a patch that corrects the 2-D output orientation for vector
interpolation points. For same-orientation xi & yi, the output XI, YI, ZI now
have the same orientation. For row/column mixes of xi and yi (in either
combination), [xi,yi]=meshgrid(xi,yi) .  BIST added to verify those changes. 

patch attached. my build machine is being rebuilt so I haven't had a chance to
run it through the test suite yet to see if it breaks anything else. Marking
as Patch submitted. title updated slightly as there does seem to be an actual
compatibility issue with the output orientation separate from the original
meshgrid issue. Not sure that's severe enough to push to stable, but change
was simple enough that that could be done if warranted. 

writing the BISTS, i did notice a more concerning issue with teh linear
interpolation. might make another report.  see simple linear ramp:


>> abc=[1:10].*[1:10]'
abc =

     1     2     3     4     5     6     7     8     9    10
     2     4     6     8    10    12    14    16    18    20
     3     6     9    12    15    18    21    24    27    30
     4     8    12    16    20    24    28    32    36    40
     5    10    15    20    25    30    35    40    45    50
     6    12    18    24    30    36    42    48    54    60
     7    14    21    28    35    42    49    56    63    70
     8    16    24    32    40    48    56    64    72    80
     9    18    27    36    45    54    63    72    81    90
    10    20    30    40    50    60    70    80    90   100

##Matlab:
>> griddata(1:10,1:10,abc,[1 5 10], [1 5 10])

ans =

     1    25   100


Octave:
>> griddata(1:10,1:10,abc,[1 5 10], [1 5 10])

ans =

    2.0111       NaN   89.8889




(file #55544)

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Additional Item Attachment:

File name: griddata_vector_inputs_bug65134.diff Size:5 KB
   
<https://file.savannah.gnu.org/file/griddata_vector_inputs_bug65134.diff?file_id=55544>


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