Date: Sun, 18 Jul 2010 19:00:04 -0500
Reply-To: Joe Matise <snoopy369@GMAIL.COM>
Sender: "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From: Joe Matise <snoopy369@GMAIL.COM>
Subject: Re: Bona fide DO-loop bug (was: Re: Combining iterative DO and
UNTIL condition)
In-Reply-To: <0371DF5940754612AD5F22CF22D63205@KAM1720>
Content-Type: text/plain; charset=ISO-8859-1
I think it's obvious what it does.
Just looking at the last part:
do i = 1 to 10 while i > 3;
It starts with 1.
It sees that 1 is not > 3.
It terminates that portion of the loop.
That's what it should do, in my opinion. DO WHILE means do things until you
first find a false statement then end.
-Joe
On Sun, Jul 18, 2010 at 6:54 PM, Kevin Myers <KevinMyers@austin.rr.com>wrote:
> The previous example (final while expression was n<8) printed:
> 2, 1, 2, 3, 4, 5, 6, 7
>
> So by only changing the final while expression to n>3, I would have
> expected:
> 2, 4, 5, 6, 7, 8, 9, 10
>
>
> ----- Original Message -----
> From: "Data _null_;" <iebupdte@GMAIL.COM>
> To: <SAS-L@LISTSERV.UGA.EDU>
> Sent: Sunday, July 18, 2010 18:34
> Subject: Re: Bona fide DO-loop bug (was: Re: Combining iterative DO and
> UNTIL condition)
>
>
> What do you thing it should do?
>>
>> 2 while(n=2) seems the only one that is ever true.
>>
>>
>> On 7/18/10, Kevin Myers <KevinMyers@austin.rr.com> wrote:
>>
>>> In fact, neither does this:
>>> data _null_;
>>>
>>> do n=1 while(n>2), 2 while(n=2), 3 while(n<2), 1 to 10 while(n>3);
>>>
>>> put n=;
>>>
>>> end;
>>>
>>> run;
>>>
>>> ----- Original Message -----
>>> From: Kevin Myers
>>> To: toby dunn ; sas-l@listserv.uga.edu ; Paul Dorfman
>>> Sent: Sunday, July 18, 2010 18:14
>>> Subject: Re: Bona fide DO-loop bug (was: Re: Combining iterative DO and
>>> UNTIL condition)
>>>
>>>
>>> Interesting, and buggy...
>>>
>>> This works as anticipated:
>>> data _null_;
>>>
>>> do n=1 while(n>2), 2 while(n=2), 3 while(n<2), 1 to 10 while(n<8);
>>>
>>> put n=;
>>>
>>> end;
>>>
>>> run;
>>>
>>>
>>> But this doesn't:
>>> data _null_;
>>>
>>> do n=1 while(n>2), 2 while(n=2), 3 while(n<2), 1 to 10
>>> while(mod(n,3)=0);
>>>
>>> put n=;
>>>
>>> end;
>>>
>>> run;
>>>
>>>
>>>
>>> ----- Original Message -----
>>> From: Kevin Myers
>>> To: toby dunn ; sas-l@listserv.uga.edu ; Paul Dorfman
>>> Sent: Sunday, July 18, 2010 18:03
>>> Subject: Re: Bona fide DO-loop bug (was: Re: Combining iterative DO
>>> and UNTIL condition)
>>>
>>>
>>> Perhaps this example better illustrates the behavior:
>>>
>>> 6 data _null_;
>>>
>>> 7 do n=1 while(n>2), 2 while(n=2), 3 while(n<2);
>>>
>>> 8 put n=;
>>>
>>> 9 end;
>>>
>>> 10 run;
>>>
>>> n=2
>>>
>>> NOTE: DATA statement used:
>>>
>>> real time 0.00 seconds
>>>
>>> cpu time 0.00 seconds
>>>
>>>
>>>
>>>
>>>
>>> ----- Original Message -----
>>> From: toby dunn
>>> To: kevinmyers@austin.rr.com ; sas-l@listserv.uga.edu ; Paul Dorfman
>>> Sent: Sunday, July 18, 2010 17:54
>>> Subject: RE: Bona fide DO-loop bug (was: Re: Combining iterative DO
>>> and UNTIL condition)
>>>
>>>
>>> Paul,
>>>
>>> A little digging and I cam across this in the docs:
>>>
>>> A WHILE or UNTIL specification affects only the last item in the
>>> clause in which it is located.
>>>
>>> So Do I = 1 , 2 , 3 Until( I = 2 ) , would mean it is only checked
>>> for the 3 and not the 1 or 2. Which means using the a hybrid Do iterative
>>> list and and a While|Until is pretty much worthless hunk of shit code.
>>> Which after a little testing seems to hold true.
>>>
>>> Toby Dunn
>>>
>>> "Don't bail. The best gold is at the bottom of barrels of crap."
>>> Randy Pausch
>>>
>>> "Be prepared. Luck is where preparation meets opportunity."
>>> Randy Pausch
>>>
>>>
>>>
>>>
>>> > Date: Sun, 18 Jul 2010 17:03:27 -0500
>>> > From: KevinMyers@AUSTIN.RR.COM
>>> > Subject: Re: Bona fide DO-loop bug (was: Re: Combining iterative
>>> DO and UNTIL condition)
>>> > To: SAS-L@LISTSERV.UGA.EDU
>>> >
>>> > Toby, I think you may be missing the point on this one. It is
>>> performing as
>>> > designed/intended. The While/Until clause only applies to the
>>> individual
>>> > comma delimited portion of the DO loop indexes of which it is a
>>> part. Each
>>> > comma delimited portion of the DO loop index is treated in essence
>>> as if it
>>> > is controlling completely separate set of iterations for the DO
>>> loop. You
>>> > iterate over and exit from the first command delimited index
>>> clause before
>>> > moving on to the next comma delimited portion.
>>> >
>>> > s/KAM
>>> >
>>> >
>>> > ----- Original Message -----
>>> > From: "toby dunn" <tobydunn@HOTMAIL.COM>
>>> > To: <SAS-L@LISTSERV.UGA.EDU>
>>> > Sent: Sunday, July 18, 2010 16:54
>>> > Subject: Re: Bona fide DO-loop bug (was: Re: Combining iterative
>>> DO and
>>> > UNTIL condition)
>>> >
>>> >
>>> > Good point Data _Null_, I hadnt thought to add a value greater
>>> than 2 as the
>>> > first element. Seems the bug still holds true
>>> >
>>> > Toby Dunn
>>> >
>>> > "Don't bail. The best gold is at the bottom of barrels of crap."
>>> > Randy Pausch
>>> >
>>> > "Be prepared. Luck is where preparation meets opportunity."
>>> > Randy Pausch
>>> >
>>> >
>>> >
>>> >
>>> > > Date: Sun, 18 Jul 2010 16:26:31 -0500
>>> > > Subject: Re: Bona fide DO-loop bug (was: Re: Combining iterative
>>> DO and
>>> > > UNTIL condition)
>>> > > From: iebupdte@gmail.com
>>> > > To: tobydunn@hotmail.com
>>> > > CC: SAS-L@listserv.uga.edu
>>> > >
>>> > > On 7/18/10, toby dunn <tobydunn@hotmail.com> wrote:
>>> > > > Especially in light of the fact that this does work as
>>> expected:
>>> > > > data _null_ ;
>>> > > > do x = 1, 2, 3 While (x < 3) ;
>>> > > > put x= ;
>>> > > > end ;
>>> > > > Run ;
>>> > >
>>> > > I believe your example is flawed.
>>> > >
>>> > > 120 data _null_;
>>> > > 121 do x = 4, 1, 2, 3 While (x < 3) ;
>>> > > 122 put x=;
>>> > > 123 end;
>>> > > 124 run;
>>> > >
>>> > > x=4
>>> > > x=1
>>> > > x=2
>>> > >
>>> > > You/we need to understand what the COMMA means and what syntax
>>> > > elements it "delimites".
>>> >
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