[Octave-bug-tracker] [bug #36867] randn gives same number when rand is initialised with a random seed

[B]

URL:
  <http://savannah.gnu.org/bugs/?36867>

                 Summary: randn gives same number when rand is initialised
with a random seed
                 Project: GNU Octave
            Submitted by: brt
            Submitted on: Wed 18 Jul 2012 05:34:29 PM GMT
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
             Assigned to: None
         Originator Name: B
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.2.4
        Operating System: Mac OS

    _______________________________________________________

Details:

If I have a script with the following contents

rand('seed',ceil(rand*1000))
rand
randn

then it will output two random numbers. However, if I run this
script twice from the command line with 'octave --eval
script.m', very quickly after each other, then the second random
number of the first run is the same as to the second run. The
first random number does differ between the runs. If one waits a
bit longer, then the two second random numbers are different.

>From my point of view the expected behaviour would be that the
second random number should be different between different runs,
as is with the first random number.

That is the reason I though this could be considered a bug.




    _______________________________________________________

Reply to this item at:

  <http://savannah.gnu.org/bugs/?36867>

_______________________________________________
  Message sent via/by Savannah
  http://savannah.gnu.org/