[Octave-bug-tracker] [bug #40564] nanvar

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?40564>

                 Summary: nanvar
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Wed 13 Nov 2013 10:27:07 UTC
                Category: Octave Forge Package
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.6.4
        Operating System: GNU/Linux

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Details:

Hello,

I am getting complex or real number outputs from nanvar.m  depending on the
array dimensions. The type of output change from complex to real but the real
part remains the same. I (and the scripts I wrote) are not expecting this kind
of change: variance is by definition a real number. 

Code:
load test.bin
data_var1 = (nanvar(data_aux(:,:),0,1));
data_var2 = (nanvar(data_aux(:,1:5),0,1));

display(data_var1(1:5))
display(data_var2(1:5))

And you will get for data_var1(1:5) :
"          NaN -        NaNi          NaN -        NaNi   2.5990e+15 +
0.0000e+00i   1.2460e+17 + 0.0000e+00i   9.3657e+16 + 0.0000e+00i"

And for data_var2(1:5):
"          NaN                        NaN   2.5990e+15              1.2460e+17
  9.3657e+16"

Perhaps the better is to guarantee a real output using real(v) ?

Best regards,
eddc





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File Attachments:


-------------------------------------------------------
Date: Wed 13 Nov 2013 10:27:07 UTC  Name: test.bin  Size: 200kB   By: None

<http://savannah.gnu.org/bugs/download.php?file_id=29606>

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