[25969] in Perl-Users-Digest
Perl-Users Digest, Issue: 8188 Volume: 10
daemon@ATHENA.MIT.EDU (Perl-Users Digest)
Mon Jun 20 09:05:33 2005
Date: Mon, 20 Jun 2005 06:05:08 -0700 (PDT)
From: Perl-Users Digest <Perl-Users-Request@ruby.OCE.ORST.EDU>
To: Perl-Users@ruby.OCE.ORST.EDU (Perl-Users Digest)
Perl-Users Digest Mon, 20 Jun 2005 Volume: 10 Number: 8188
Today's topics:
Re: Q for the old-timers: antecedents to the ST? <ron@savage.net.au>
concatenating strings or sprintf? <jens.luedicke@gmail.com>
Re: concatenating strings or sprintf? <tintin@invalid.invalid>
Re: concatenating strings or sprintf? <sherm@dot-app.org>
Re: concatenating strings or sprintf? <kevin@vaildc.net>
Re: How to kill a forked child process... <moritz.karbach@desy.de>
Re: How to kill a forked child process... <moritz.karbach@desy.de>
Re: Q for the old-timers: antecedents to the ST? <dha@panix.com>
Re: Q for the old-timers: antecedents to the ST? <abigail@abigail.nl>
Digest Administrivia (Last modified: 6 Apr 01) (Perl-Users-Digest Admin)
----------------------------------------------------------------------
Date: Mon, 20 Jun 2005 20:00:35 +1000
From: Ron Savage <ron@savage.net.au>
Subject: Re: Q for the old-timers: antecedents to the ST?
Message-Id: <200562020035.916307@ron>
On Mon, 20 Jun 2005 04:47:03 +1000, kj wrote:
Hi kj
> technique. After all, there is a very similar technique, which
> I've seen referred to as "tag shuffling", for randomly shuffling a
> list. In Perl it would be rendered like this:
It used to be called a 'tag sort', from the time when computer memory was=
tiny.
The algorithm was:
o Stockpile the key and the disk address for each record
o Sort the keys, dragging around the disk address with each key. This disk
address is no more than a (C-style) pointer to the data
o Retrieve the keys in sorted order, and with each key, get the disk address=
and
from that the original record. So, you only need 1 record in memory at a=
time
o Write the records in sorted order
It's quite theoretical compared to most things students had to learn back=
then,
and I can assure you getting the concept across was a painful process.
When I say theoretical, I don't mean difficult, but rather just that it=
required
a visualization manoeuvre students had simply never encountered before.
------------------------------
Date: Mon, 20 Jun 2005 12:23:11 +0200
From: Jens Luedicke <jens.luedicke@gmail.com>
Subject: concatenating strings or sprintf?
Message-Id: <42b698ff$0$27789$9b4e6d93@newsread2.arcor-online.net>
-----BEGIN xxx SIGNED MESSAGE-----
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Hiya..
I have a stupid question, what is more efficient to glue strings
together? using the . operator or sprintf()?
- --
Jens Luedicke
web: http://perldude.de
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Date: Mon, 20 Jun 2005 22:54:45 +1200
From: "Tintin" <tintin@invalid.invalid>
Subject: Re: concatenating strings or sprintf?
Message-Id: <Ufxte.8729$U4.1185702@news.xtra.co.nz>
"Jens Luedicke" <jens.luedicke@gmail.com> wrote in message
news:42b698ff$0$27789$9b4e6d93@newsread2.arcor-online.net...
> I have a stupid question, what is more efficient to glue strings
> together? using the . operator or sprintf()?
Why use either?
my $string1='foo';
my $string2='bar';
my $concat="$string1$string2";
------------------------------
Date: Mon, 20 Jun 2005 06:03:24 -0400
From: Sherm Pendley <sherm@dot-app.org>
Subject: Re: concatenating strings or sprintf?
Message-Id: <87r7ex4a6r.fsf@dot-app.org>
Jens Luedicke <jens.luedicke@gmail.com> writes:
> I have a stupid question, what is more efficient to glue strings
> together? using the . operator or sprintf()?
I don't know, but the Benchmark module would be useful for finding out. I
wouldn't expect the difference to be all that significant without a few
bajillion iterations.
sherm--
------------------------------
Date: Mon, 20 Jun 2005 11:39:31 GMT
From: Kevin Michael Vail <kevin@vaildc.net>
Subject: Re: concatenating strings or sprintf?
Message-Id: <kevin-C6A3BD.07393120062005@news.verizon.net>
In article <Ufxte.8729$U4.1185702@news.xtra.co.nz>,
"Tintin" <tintin@invalid.invalid> wrote:
> "Jens Luedicke" <jens.luedicke@gmail.com> wrote in message
> news:42b698ff$0$27789$9b4e6d93@newsread2.arcor-online.net...
> > I have a stupid question, what is more efficient to glue strings
> > together? using the . operator or sprintf()?
>
> Why use either?
>
> my $string1='foo';
> my $string2='bar';
>
> my $concat="$string1$string2";
I think this is the same internally as:
$string1 . $string2
--
Kevin Michael Vail | a billion stars go spinning through the night,
kevin@vaildc.net | blazing high above your head.
. . . . . . . . . | But _in_ you is the presence that
. . . . . . . . | will be, when all the stars are dead.
. . . . . . . . . | (Rainer Maria Rilke)
------------------------------
Date: Fri, 17 Jun 2005 19:13:25 +0200
From: Moritz Karbach <moritz.karbach@desy.de>
Subject: Re: How to kill a forked child process...
Message-Id: <d960g7$512e7$1@claire.desy.de>
> The parent process of the child (not the sibling) must wait() or ignore
> $SIG{CHLD}.
Thanks for the hint. I moved the
$SIG{CHLD} = "IGNORE";
$SIG{CLD} = "IGNORE";
to the parent and the zombies disappeared.
> This doesn't really have anything to do with Perl, this is a Unix
> question.
I'm sorry. Since both Perl and Unix signal handling are relatively new to
me, it's hard for me to distinguish.
Cheers,
- Moritz
------------------------------
Date: Mon, 20 Jun 2005 11:08:22 +0200
From: Moritz Karbach <moritz.karbach@desy.de>
Subject: Re: How to kill a forked child process...
Message-Id: <d96127$514v0$1@claire.desy.de>
Sorry for the multiple postings, got problems with IT...
- Moritz
------------------------------
Date: Mon, 20 Jun 2005 06:29:11 +0000 (UTC)
From: "David H. Adler" <dha@panix.com>
Subject: Re: Q for the old-timers: antecedents to the ST?
Message-Id: <slrndbcohn.9ts.dha@panix2.panix.com>
On 2005-06-19, Tad McClellan <tadmc@augustmail.com> wrote:
> Anno Siegel <anno4000@lublin.zrz.tu-berlin.de> wrote:
>
>
>> So whoever it was,
>
>
> Tom Christiansen, I'm pretty sure.
>
>
>> half-jokingly called it "Schwartz Transform" and the name stuck.
Yes, it was Tom. If memory serves, he didn't mean the eponymy as a
compliment... :-)
dha
--
David H. Adler - <dha@panix.com> - http://www.panix.com/~dha/
"Well, to make this story the way it should be done we will
[need] technology that won't invented for 30 years and a budget that
could pay for a large south american country." "What have we got?" "25
cents and a block of wood." - Possible Dr. Who budget conference
------------------------------
Date: 20 Jun 2005 07:32:06 GMT
From: Abigail <abigail@abigail.nl>
Subject: Re: Q for the old-timers: antecedents to the ST?
Message-Id: <slrndbcs7l.14f.abigail@alexandra.abigail.nl>
David H. Adler (dha@panix.com) wrote on MMMMCCCXI September MCMXCIII in
<URL:news:slrndbcohn.9ts.dha@panix2.panix.com>:
== On 2005-06-19, Tad McClellan <tadmc@augustmail.com> wrote:
== > Anno Siegel <anno4000@lublin.zrz.tu-berlin.de> wrote:
== >
== >
== >> So whoever it was,
== >
== >
== > Tom Christiansen, I'm pretty sure.
== >
== >
== >> half-jokingly called it "Schwartz Transform" and the name stuck.
==
== Yes, it was Tom. If memory serves, he didn't mean the eponymy as a
== compliment... :-)
Indeed.
Abigail
--
#!/opt/perl/bin/perl -w
$\ = $"; $SIG {TERM} = sub {print and exit};
kill 15 => fork for qw /Just another Perl Hacker/;
------------------------------
Date: 6 Apr 2001 21:33:47 GMT (Last modified)
From: Perl-Users-Request@ruby.oce.orst.edu (Perl-Users-Digest Admin)
Subject: Digest Administrivia (Last modified: 6 Apr 01)
Message-Id: <null>
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End of Perl-Users Digest V10 Issue 8188
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