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[Octave-bug-tracker] [bug #40613] exist(..., 'var') slow when variable d


From: anonymous
Subject: [Octave-bug-tracker] [bug #40613] exist(..., 'var') slow when variable does not exist
Date: Sun, 17 Nov 2013 23:10:49 +0000
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:25.0) Gecko/20100101 Firefox/25.0

URL:
  <http://savannah.gnu.org/bugs/?40613>

                 Summary: exist(..., 'var') slow when variable does not exist
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Sun 17 Nov 2013 11:10:48 PM UTC
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Performance
                  Status: None
             Assigned to: None
         Originator Name: Christian
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.2.4
        Operating System: GNU/Linux

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Details:

Hi,
Don't know if this is already known and fixed, but using 'exist()' to check
existance of a non-existing variable takes a very long time. See code below:


octave> who f aa*
Variables in the current scope:

f

octave> tic, for ii=1:1000, exist('f','var'); end, toc
Elapsed time is 0.0318 seconds.

octave> tic, for ii=1:1000, exist('aaa','var'); end, toc
Elapsed time is 3.579 seconds.


/Christian

PS. Corresponding code on MATLAB 2012b is pretty much instantaneous in both
cases.




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