[29810] in Perl-Users-Digest
Perl-Users Digest, Issue: 1053 Volume: 11
daemon@ATHENA.MIT.EDU (Perl-Users Digest)
Fri Nov 23 09:09:39 2007
Date: Fri, 23 Nov 2007 06:09:04 -0800 (PST)
From: Perl-Users Digest <Perl-Users-Request@ruby.OCE.ORST.EDU>
To: Perl-Users@ruby.OCE.ORST.EDU (Perl-Users Digest)
Perl-Users Digest Fri, 23 Nov 2007 Volume: 11 Number: 1053
Today's topics:
Re: A little help on perl coding.. <zen13097@zen.co.uk>
Can you pl. take a look here? clearguy02@yahoo.com
float -> RGB <alexxx.magni@gmail.com>
Re: float -> RGB <1usa@llenroc.ude.invalid>
Re: float -> RGB <njus@larshaugseth.com>
Re: How to clean up this ugly code? <zen13097@zen.co.uk>
Re: How to get the string Cartesian Products of 2 list <njus@larshaugseth.com>
Re: How to get the string Cartesian Products of 2 list <bik.mido@tiscalinet.it>
Re: How to get the string Cartesian Products of 2 list <bik.mido@tiscalinet.it>
Re: interesting case of data corruption, and its cause <bugbear@trim_papermule.co.uk_trim>
Re: minicpan, CPAN/CPANPLUS and autobundles on linux <bik.mido@tiscalinet.it>
Re: packaging apps as a distributable exe <vijay@iavian.com>
Posting Guidelines for comp.lang.perl.misc ($Revision: tadmc@seesig.invalid
Digest Administrivia (Last modified: 6 Apr 01) (Perl-Users-Digest Admin)
----------------------------------------------------------------------
Date: 23 Nov 2007 08:28:55 GMT
From: Dave Weaver <zen13097@zen.co.uk>
Subject: Re: A little help on perl coding..
Message-Id: <47468f47$0$13929$fa0fcedb@news.zen.co.uk>
On Thu, 22 Nov 2007 10:38:18 -0800 (PST),
clearguy02@yahoo.com <clearguy02@yahoo.com> wrote:
> The following piece is not working.
What does "not working" mean? It is the most useless problem description
ever. What does it not do that you would like it to do? What does it do
that you don't want it to do? Where is the sample input data? What do
you expect the output to be?
Please read the posting guidelines for this group. They are posted
here regularly.
> %users;
What do you think that line does?
ITYM:
my %users
>
> while (<DATA>)
> {
> chop;
Don't use chop(), use chomp() which will correctly remove the input
record separator no matter how many characters it is.
> ($nt_id, $name, $uid, $mid) = split(/\s+/);
>
> $users{$nt_id} = [$name, $uid, $mid];
> }
>
> close(DATA);
>
>
> for $uid (keys %users)
for my $uid ( keys %users )
> {
> $mid = $users{$uid}->{mid};
That won't work, because $users{$uid} is a reference to an array, not
a hash.
my $uid = $users{$uid}[2];
> $manager_id = $users{$mid}->{$nt_id};
I've no idea what you're trying to do here, but you're not storing the
nt_id anywhere in the values of the users hash...
> $users{$uid}->{mid} = $manager_id;
>
> print "$nt_id\t\t$manager_id\n";
> }
Post again, giving a *short* but *complete* program (including sample data in a
__DATA__ section) that we can all run, that exhibits the problem you have, and
explain what the problem is.
------------------------------
Date: Fri, 23 Nov 2007 01:02:42 -0800 (PST)
From: clearguy02@yahoo.com
Subject: Can you pl. take a look here?
Message-Id: <66e8698f-caef-4e09-8202-cfc81e692bd1@e6g2000prf.googlegroups.com>
Hi all,
Here is the problem description.
__DATA__
# user_id name email user_uid manager_uid
jcarter john a@gmail.com 00206251 00207609
mstella mary b@yahoo.com 00207609 00220458
msmith martin c@gmail.com 00202227 00207609
bborders bob d@gmail.com 00220458 00202003
swatson sush e@yahoo.com 00224981 00207609
rcasey rick f@gmail.com 00202003 00201009
------------------------------------------------------------------
mstella is the boss of jcarter, msmith and swatson;
bborders is the boss of mstella;
rcasey is the boss of bborders;
Now I need to replace the manager uid's with the boss id's; for the
top-most manager's id, you can replace his manager uid with his user
id itself (in this case rcasey is the top-most guy).
i.e the output file should be as follows:
++++++++++++++++++++++++++++++++++++++++++++++++++++
# user_id name email manager_id
jcarter john a@gmail.com mstella
mstella mary b@yahoo.com bborders
msmith martin c@gmail.com mstella
bborders bob d@gmail.com rcasey
swatson sush e@yahoo.com mstella
rcasey rick f@gmail.com rcasey
+++++++++++++++++++++++++++++++++++++++++++++++++++++
Here is my code:
while (<DATA>)
{
$line = $_;
@lineArray = split (/\s+/, $line);
if ($lineArray[3] == $lineArray[2])
{
s/$lineArray[3]/$lineArray[0]/g;
}
print "$lineArray[0]\t\t$lineArray[1]\t\t$lineArray[3]\n";
}
I am struggling with the part of replacing the the numerical
manager_uid with the manager_id.
Thanks in advance,
JC
------------------------------
Date: Fri, 23 Nov 2007 05:00:13 -0800 (PST)
From: "alexxx.magni@gmail.com" <alexxx.magni@gmail.com>
Subject: float -> RGB
Message-Id: <55d8528e-dd07-44da-b52a-684750630fab@s19g2000prg.googlegroups.com>
Greetings,
I know this isnt a perlish problem,
but I need to transform a float $x=0..1 in RGB values ($R,$G,$B)
according to whichever palette you want...
but I'm not expert at all in graphics problems, so it's not clear to
me how to do it - hope somebody can drop down a couple of lines!
thanks...
Alessandro
------------------------------
Date: Fri, 23 Nov 2007 13:43:31 GMT
From: "A. Sinan Unur" <1usa@llenroc.ude.invalid>
Subject: Re: float -> RGB
Message-Id: <Xns99F158C25602Casu1cornelledu@127.0.0.1>
"alexxx.magni@gmail.com" <alexxx.magni@gmail.com> wrote in
news:55d8528e-dd07-44da-b52a-684750630fab@s19g2000prg.googlegroups.com:
> Greetings,
> I know this isnt a perlish problem,
> but I need to transform a float $x=0..1 in RGB values ($R,$G,$B)
> according to whichever palette you want...
> but I'm not expert at all in graphics problems, so it's not clear to
> me how to do it - hope somebody can drop down a couple of lines!
This is line one.
This is line two.
You are very welcome.
On a more serious note, your question is not well-defined.
Define:
U = [0,1]
R = { 0, 1, 2, ..., 255 }
G = { 0, 1, 2, ..., 255 }
B = { 0, 1, 2, ..., 255 }
Then, the function
f : U -> R x G x B
defined by f(x) = round( (255, 255, 255)*x, 0 )
is a natural mapping of real fractions to RGB triplets.
Now, what do you mean "according to whichever palette you want"?
In any case, note that the answer to some well defined version of your
question is independent of the programming language used but anyone's
ability to provide the answer you are seeking is highly dependent on
your ability to specify the question you want to ask.
Sinan
--
A. Sinan Unur <1usa@llenroc.ude.invalid>
(remove .invalid and reverse each component for email address)
clpmisc guidelines: <URL:http://www.augustmail.com/~tadmc/clpmisc.shtml>
------------------------------
Date: 23 Nov 2007 14:30:52 +0100
From: Lars Haugseth <njus@larshaugseth.com>
Subject: Re: float -> RGB
Message-Id: <m1r6ihccmr.fsf@vader.eiendomsnett.no>
* "alexxx.magni@gmail.com" <alexxx.magni@gmail.com> wrote:
>
> Greetings,
> I know this isnt a perlish problem,
> but I need to transform a float $x=0..1 in RGB values ($R,$G,$B)
> according to whichever palette you want...
> but I'm not expert at all in graphics problems, so it's not clear to
> me how to do it - hope somebody can drop down a couple of lines!
You haven't told us what the "float" number represent.
You haven't told us what range the RGB values should have.
You haven't told us what a palette is and how it is stored.
Until you specify this, there are an unlimited number of ways to
do such a mapping.
Here's one:
$R = $G = $B = $x;
Probably not what you want.
--
Lars Haugseth
"If anyone disagrees with anything I say, I am quite prepared not only to
retract it, but also to deny under oath that I ever said it." -Tom Lehrer
------------------------------
Date: 23 Nov 2007 08:12:24 GMT
From: Dave Weaver <zen13097@zen.co.uk>
Subject: Re: How to clean up this ugly code?
Message-Id: <47468b68$0$13929$fa0fcedb@news.zen.co.uk>
On Thu, 22 Nov 2007 15:21:45 -0800 (PST),
blaine@worldweb.com <blaine@worldweb.com> wrote:
>
> Code I'd like to clean is below...
>
> SWITCH: for ($subpage_id)
> {
> if (/^1$/) {$self->DisplayPage; last SWITCH;}
> elsif (/^2$/) {$self->DisplayPage2; last SWITCH;}
> elsif (/^3$/) {$self->DisplayPage3; last SWITCH;}
> elsif (/^4$/) {$self->DisplayPage4; last SWITCH;}
> elsif (/^5$/) {$self->DisplayPage5; last SWITCH;}
> elsif (/^6$/) {$self->DisplayPage6; last SWITCH;}
> elsif (/^7$/) {$self->DisplayPage7; last SWITCH;}
> elsif (/^8$/) {$self->DisplayPage8; last SWITCH;}
> elsif (/^9$/) {$self->DisplayPage9; last SWITCH;}
> }
my @dispatch = (
\&DisplayPage,
\&DisplayPage2,
\&DisplayPage3,
# ...
);
my $method = $dispatch[ $subpage_id - 1 ]
or die "Page '$subpage_id' doesn't exist";
$self->$method();
------------------------------
Date: 23 Nov 2007 11:02:57 +0100
From: Lars Haugseth <njus@larshaugseth.com>
Subject: Re: How to get the string Cartesian Products of 2 list
Message-Id: <m1ve7tcm9a.fsf@vader.eiendomsnett.no>
* xueweizhong@gmail.com wrote:
>
> Give 2 string list such as: a..b and 1..3, i want to get a list which
> is (a1, a2, a3, b1, b2, b3). Is there an elegant way in perl to
> fullfill this withou using loop BLOCK? Or Is there a elegant one line
> expression to get this?
$ perl -le '@list = glob "{a,b}{1,2,3}"; print join(",", @list);'
a1,a2,a3,b1,b2,b3
--
Lars Haugseth
"If anyone disagrees with anything I say, I am quite prepared not only to
retract it, but also to deny under oath that I ever said it." -Tom Lehrer
------------------------------
Date: Fri, 23 Nov 2007 13:30:35 +0100
From: Michele Dondi <bik.mido@tiscalinet.it>
Subject: Re: How to get the string Cartesian Products of 2 list
Message-Id: <suhdk3loo9pnbddbf3hemvdd1bb39173cq@4ax.com>
On Thu, 22 Nov 2007 19:22:57 -0800 (PST), xueweizhong@gmail.com wrote:
>Also i find this URL for adding this into the core language:
>http://www.nntp.perl.org/group/perl.perl6.language.data/2000/09/msg462.html
Into the core of *another* language! ;)
Michele
--
{$_=pack'B8'x25,unpack'A8'x32,$a^=sub{pop^pop}->(map substr
(($a||=join'',map--$|x$_,(unpack'w',unpack'u','G^<R<Y]*YB='
.'KYU;*EVH[.FHF2W+#"\Z*5TI/ER<Z`S(G.DZZ9OX0Z')=~/./g)x2,$_,
256),7,249);s/[^\w,]/ /g;$ \=/^J/?$/:"\r";print,redo}#JAPH,
------------------------------
Date: Fri, 23 Nov 2007 13:31:15 +0100
From: Michele Dondi <bik.mido@tiscalinet.it>
Subject: Re: How to get the string Cartesian Products of 2 list
Message-Id: <uvhdk3h4un84anh55n4a5maosg0vicqaq0@4ax.com>
On Thu, 22 Nov 2007 21:40:06 -0800 (PST), xueweizhong@gmail.com wrote:
>Finally i got this one on bash3.0:
>
> print qx'bash -c "echo {1..3}{a..c}"'
>
>Perl is the glue language and there are more than one way to do it:-)
Perl does glob() espansion too.
Michele
--
{$_=pack'B8'x25,unpack'A8'x32,$a^=sub{pop^pop}->(map substr
(($a||=join'',map--$|x$_,(unpack'w',unpack'u','G^<R<Y]*YB='
.'KYU;*EVH[.FHF2W+#"\Z*5TI/ER<Z`S(G.DZZ9OX0Z')=~/./g)x2,$_,
256),7,249);s/[^\w,]/ /g;$ \=/^J/?$/:"\r";print,redo}#JAPH,
------------------------------
Date: Fri, 23 Nov 2007 10:34:48 +0000
From: bugbear <bugbear@trim_papermule.co.uk_trim>
Subject: Re: interesting case of data corruption, and its cause
Message-Id: <13kdb694hkfr129@corp.supernews.com>
Uri Guttman wrote:
>>>>>> "b" == bugbear <bugbear@trim_papermule.co.uk_trim> writes:
>
> b> Peter Makholm wrote:
> >> bugbear <bugbear@trim_papermule.co.uk_trim> writes:
> >>
> >>> I wrote a subroutine, called (e.g.) "extract",
> >>> which takes a single src object, and returns a
> >>> new object.
> >> And obviously changes the source object in some way. So I guess that
> >> you
> >> extract function works on $_[0] and not starting with something like:
> >> sub extract {
> >> my $src = shift;
>
> b> actually:
>
> b> sub extract {
> b> my ($src) = @_;
>
> b> It's the assignment/use of the (global) $_ many miles away
> b> (in code terms) that's (was) killing me.
>
> append this to that code to protect $_:
>
> local( $_ ) ;
>
> you now have copied $_ into $src and have a dynamic new $_ for the code
> to be called.
>
> this is also another reason not to use $_ unless you have to (map/grep,
> etc.). in your i/o loops use lexical vars (never while(<FOO>) as it sets
> $_).
>
> while( my $line = <FOO> ) {
>
> or use file::slurp if the file size isn't humongous (which is < a few meg
> these days).
Oh, all agreed. I now understand (and have done) the localisation of $_.
My point is that this syndrome is fairly easy to fall into,
and doesn't appear to be widely known or spoken of.
(this is a good write up)
http://perl.plover.com/local.html
search down for "Although you may not think about it much"
BugBear
------------------------------
Date: Fri, 23 Nov 2007 13:47:39 +0100
From: Michele Dondi <bik.mido@tiscalinet.it>
Subject: Re: minicpan, CPAN/CPANPLUS and autobundles on linux
Message-Id: <6uidk3db21l9q3ogd7a0s2so1p4dhegfod@4ax.com>
On Wed, 21 Nov 2007 20:10:10 -0800, Joseph Brenner
<doom@kzsu.stanford.edu> wrote:
>I'm getting my laptop (AMD64 based) set-up with the latest
>version of Kubuntu (7.10 Gutsy Gibbon), and I'm trying to do
>something that doesn't seem to me like it should be terribly
>complicated, but I'm running into some funny problem I'm not
>seeing:
Since it didn't receive any answers, I replicated your question with
proper attributions at
http://perlmonks.org/?node_id=652558
Michele
--
{$_=pack'B8'x25,unpack'A8'x32,$a^=sub{pop^pop}->(map substr
(($a||=join'',map--$|x$_,(unpack'w',unpack'u','G^<R<Y]*YB='
.'KYU;*EVH[.FHF2W+#"\Z*5TI/ER<Z`S(G.DZZ9OX0Z')=~/./g)x2,$_,
256),7,249);s/[^\w,]/ /g;$ \=/^J/?$/:"\r";print,redo}#JAPH,
------------------------------
Date: Fri, 23 Nov 2007 04:05:18 -0800 (PST)
From: "vijay@iavian.com" <vijay@iavian.com>
Subject: Re: packaging apps as a distributable exe
Message-Id: <869ac233-cfca-47bd-bf7f-e47c9a789943@s36g2000prg.googlegroups.com>
On Nov 23, 12:59 pm, Astr...@gmail.com wrote:
> On Nov 23, 5:58 am, aardvark...@gmail.com wrote:
>
> > HI,
>
> > This app looks surprisingly mature, but I never saw it before. Has
> > anyone used it to distribute a perl app as an exe?
>
ANy Perl App
------------------------------
Date: Fri, 23 Nov 2007 08:10:46 GMT
From: tadmc@seesig.invalid
Subject: Posting Guidelines for comp.lang.perl.misc ($Revision: 1.8 $)
Message-Id: <aWv1j.73923$Um6.53057@newssvr12.news.prodigy.net>
Outline
Before posting to comp.lang.perl.misc
Must
- Check the Perl Frequently Asked Questions (FAQ)
- Check the other standard Perl docs (*.pod)
Really Really Should
- Lurk for a while before posting
- Search a Usenet archive
If You Like
- Check Other Resources
Posting to comp.lang.perl.misc
Is there a better place to ask your question?
- Question should be about Perl, not about the application area
How to participate (post) in the clpmisc community
- Carefully choose the contents of your Subject header
- Use an effective followup style
- Speak Perl rather than English, when possible
- Ask perl to help you
- Do not re-type Perl code
- Provide enough information
- Do not provide too much information
- Do not post binaries, HTML, or MIME
Social faux pas to avoid
- Asking a Frequently Asked Question
- Asking a question easily answered by a cursory doc search
- Asking for emailed answers
- Beware of saying "doesn't work"
- Sending a "stealth" Cc copy
Be extra cautious when you get upset
- Count to ten before composing a followup when you are upset
- Count to ten after composing and before posting when you are upset
-----------------------------------------------------------------
Posting Guidelines for comp.lang.perl.misc ($Revision: 1.8 $)
This newsgroup, commonly called clpmisc, is a technical newsgroup
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Check the other standard Perl docs (*.pod)
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Try doing a word-search in the standard docs for some words/phrases
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Lurk for a while before posting
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Search a Usenet archive
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can find where it has already been answered.
One such searchable archive is:
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If You Like
This section describes things that you *can* do before posting to
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Check Other Resources
You may want to check in books or on web sites to see if you can
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Posting to comp.lang.perl.misc
There can be 200 messages in clpmisc in a single day. Nobody is going to
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For more information on choosing a Subject see "Choosing Good
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Speak Perl rather than English, when possible
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or I have $var = <DATA> (and show the data line).
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Do not re-type Perl code
Use copy/paste or your editor's "import" function rather than
attempting to type in your code. If you make a typo you will get
followups about your typos instead of about the question you are
trying to get answered.
Provide enough information
If you do the things in this item, you will have an Extremely Good
chance of getting people to try and help you with your problem!
These features are a really big bonus toward your question winning
out over all of the other posts that you are competing with.
First make a short (less than 20-30 lines) and *complete* program
that illustrates the problem you are having. People should be able
to run your program by copy/pasting the code from your article. (You
will find that doing this step very often reveals your problem
directly. Leading to an answer much more quickly and reliably than
posting to Usenet.)
Describe *precisely* the input to your program. Also provide example
input data for your program. If you need to show file input, use the
__DATA__ token (perldata.pod) to provide the file contents inside of
your Perl program.
Show the output (including the verbatim text of any messages) of
your program.
Describe how you want the output to be different from what you are
getting.
If you have no idea at all of how to code up your situation, be sure
to at least describe the 2 things that you *do* know: input and
desired output.
Do not provide too much information
Do not just post your entire program for debugging. Most especially
do not post someone *else's* entire program.
Do not post binaries, HTML, or MIME
clpmisc is a text only newsgroup. If you have images or binaries
that explain your question, put them in a publically accessible
place (like a Web server) and provide a pointer to that location. If
you include code, cut and paste it directly in the message body.
Don't attach anything to the message. Don't post vcards or HTML.
Many people (and even some Usenet servers) will automatically filter
out such messages. Many people will not be able to easily read your
post. Plain text is something everyone can read.
Social faux pas to avoid
The first two below are symptoms of lots of FAQ asking here in clpmisc.
It happens so often that folks will assume that it is happening yet
again. If you have looked but not found, or found but didn't understand
the docs, say so in your article.
Asking a Frequently Asked Question
It should be understood that you may have missed the applicable FAQ
when you checked, which is not a big deal. But if the Frequently
Asked Question is worded similar to your question, folks will assume
that you did not look at all. Don't become indignant at pointers to
the FAQ, particularly if it solves your problem.
Asking a question easily answered by a cursory doc search
If folks think you have not even tried the obvious step of reading
the docs applicable to your problem, they are likely to become
annoyed.
If you are flamed for not checking when you *did* check, then just
shrug it off (and take the answer that you got).
Asking for emailed answers
Emailed answers benefit one person. Posted answers benefit the
entire community. If folks can take the time to answer your
question, then you can take the time to go get the answer in the
same place where you asked the question.
It is OK to ask for a *copy* of the answer to be emailed, but many
will ignore such requests anyway. If you munge your address, you
should never expect (or ask) to get email in response to a Usenet
post.
Ask the question here, get the answer here (maybe).
Beware of saying "doesn't work"
This is a "red flag" phrase. If you find yourself writing that,
pause and see if you can't describe what is not working without
saying "doesn't work". That is, describe how it is not what you
want.
Sending a "stealth" Cc copy
A "stealth Cc" is when you both email and post a reply without
indicating *in the body* that you are doing so.
Be extra cautious when you get upset
Count to ten before composing a followup when you are upset
This is recommended in all Usenet newsgroups. Here in clpmisc, most
flaming sub-threads are not about any feature of Perl at all! They
are most often for what was seen as a breach of netiquette. If you
have lurked for a bit, then you will know what is expected and won't
make such posts in the first place.
But if you get upset, wait a while before writing your followup. I
recommend waiting at least 30 minutes.
Count to ten after composing and before posting when you are upset
After you have written your followup, wait *another* 30 minutes
before committing yourself by posting it. You cannot take it back
once it has been said.
AUTHOR
Tad McClellan and many others on the comp.lang.perl.misc newsgroup.
--
Tad McClellan
email: perl -le "print scalar reverse qq/moc.noitatibaher\100cmdat/"
------------------------------
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)
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End of Perl-Users Digest V11 Issue 1053
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