Re: Puzzled about scope/existence of globals

[Tomer Altman]

Oh, btw those experiments were done on Octave 2.1.40.

~T



On Nov 22, 2003 at 5:26pm, Glenn Golden wrote:

gdg >Date: Sat, 22 Nov 2003 17:26:02 -0700
gdg >From: Glenn Golden <address@hidden>
gdg >To: address@hidden
gdg >Subject: Puzzled about scope/existence of globals
gdg >Resent-Date: Sat, 22 Nov 2003 18:26:10 -0600
gdg >Resent-From: address@hidden
gdg >
gdg >
gdg >Given the function foo(), defined as
gdg >
gdg >    function foo()
gdg >   global g;
gdg >   exist("g", "var")
gdg >    endfunction
gdg >
gdg >I found the following to be surprising:
gdg >
gdg >    1>   foo
gdg >    ans = 0                        # ok
gdg >
gdg >    2>   global g
gdg >
gdg >    3>   g.barf = 1;
gdg >
gdg >    4>   foo
gdg >    ans = 1                        # ok
gdg >
gdg >    5>   clear g 
gdg >
gdg >    6>   whos g    
gdg >                           # ok
gdg >    7>   foo
gdg >    ans = 1                        # huh?
gdg >
gdg >Perhaps this is expected behavior, but I don't understand it.
gdg >Can someone explain the rules regarding scope and existence
gdg >of globals in a circumstance like this?
gdg >
gdg >Thanks,
gdg >
gdg >- Glenn
gdg >
gdg >
gdg >
gdg >-------------------------------------------------------------
gdg >Octave is freely available under the terms of the GNU GPL.
gdg >
gdg >Octave's home on the web:  http://www.octave.org
gdg >How to fund new projects:  http://www.octave.org/funding.html
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gdg >
gdg >



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