[Octave-bug-tracker] [bug #56047] dlmread with NaN as range parameter returns an empty array

[Mike Miller]

Update of bug #56047 (project octave):

                Severity:              3 - Normal => 2 - Minor              
              Item Group:                   Other => Incorrect Result       
                  Status:                    None => Need Info              
                 Summary: dlmread() - NaN / different file length => dlmread
with NaN as range parameter returns an empty array

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Follow-up Comment #1:

Thank you for your report. I don't know if this is a bug or not.

Since you didn't explicitly show the difference, in Octave 4.2.1 and earlier I
see


>> data = dlmread ("foo.txt", ",")
data =

   0.7246355   0.9038270   0.2715474   0.0537131   0.0062652   0.6589647
   0.5013773   0.7448110   0.9847691   0.6116570   0.3918950   0.8894601
   0.1572770   0.2567405   0.1690453   0.5567996   0.0110273   0.2038035
   0.1387583   0.5858817   0.5020694   0.4169618   0.8551791   0.0294324
   0.5909749   0.9383733   0.8427086   0.4166940   0.3021889   0.8196946
   0.8825450   0.8234280   0.3286623   0.2107583   0.9080787   0.1634514

>> size (data)
ans =

   6   6

>> data = dlmread ("foo.txt", ",", [1, 1, NaN, 2])
data =

   0.74481   0.98477
   0.25674   0.16905
   0.58588   0.50207
   0.93837   0.84271
   0.82343   0.32866



That is, NaN is a synonym for the last row or column.

In Octave 4.2.2


>> data = dlmread ("foo.txt", ",", [1, 1, NaN, 2])
data = [](0x0)


But, in Octave 4.2.2 and current versions of Octave (highly recommended to
upgrade), you can use Inf instead of NaN to get the behavior that you want.
Using a parameter of Inf makes more intuitive sense to me than NaN.

What does Matlab do with a range parameter of NaN?

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