[Octave-bug-tracker] [bug #34352] sprand/sprandn density argument is not very accurate

[Rik]

URL:
  <http://savannah.gnu.org/bugs/?34352>

                 Summary: sprand/sprandn density argument is not very accurate
                 Project: GNU Octave
            Submitted by: rik5
            Submitted on: Tue 20 Sep 2011 10:51:10 PM PDT
                Category: Libraries
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Inaccurate Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

The sprand routine creates a random sparse matrix filled to a density D.  In
practice, the resulting matrix density is usually 1-36% different from the
requested value.

Sample code

x = sprand (1000, 1000, 0.9);
density = nnz (x) / 1000^2

density =  0.59345






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