[Octave-bug-tracker] [bug #32168] [octave forge] (dataframe) support for skewness, kurtosis

[Julien Bect]

Follow-up Comment #9, bug #32168 (project octave):

Just tested with Octave 4.4 and dataframe 1.2.0:

```
>> pkg load dataframe

>> x = dataframe (rand (5, 1))
x = dataframe with 5 rows and 1 columns
_1        X
Nr   double
 1 0.471887
 2 0.431165
 3 0.268632
 4 0.573827
 5 0.031409

>> skewness (x.data)
ans = -0.65315

>> skewness (x)
ans = dataframe with 1 rows and 1 columns
_1        X
Nr   double
 1 -0.65315

>> kurtosis (x.data)
ans =  2.1050

>> kurtosis (x)
ans = dataframe with 1 rows and 1 columns
_1      X
Nr double
 1 2.1050
```

So, the problem with "zeros: invalid data type specified"  seems to be gone
;-)

The case of zero std is still not handled properly, however:

```
>> x = dataframe (zeros (5, 1))
x = dataframe with 5 rows and 1 columns
_1      X
Nr double
 1      0
 2      0
 3      0
 4      0
 5      0

>> skewness (x.data)
ans =  NaN

>> skewness (x)
error: x(1): out of bound 0
error: called from
    df_mapper>@<anonymous> at line 28 column 30
    df_mapper at line 28 column 15
    power at line 22 column 8
    skewness at line 120 column 10

>> kurtosis (x.data)
ans =  NaN

>> kurtosis (x)
error: x(1): out of bound 0
error: called from
    df_mapper>@<anonymous> at line 28 column 30
    df_mapper at line 28 column 15
    power at line 22 column 8
    kurtosis at line 123 column 10
```

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