Beefy Boxes and Bandwidth Generously Provided by pair Networks
Do you know where your variables are?
 
PerlMonks  

User Posts

( [id://1135479]=superdoc: print w/replies, xml ) Need Help??
Posts by Anonymous Monk
Imager support for PNG, JPEG and GIF on macOS Sonoma in Meditations
No replies — Read more | Post response
by Anonymous Monk
on Apr 20, 2024 at 22:51
    Installing our beloved Imager on macOS Sonoma with support for PNG, JPEG and GIF involves some pain. Here are the results of my struggle so others won't have to. Do this after installing Imager (requires Homebrew):
    brew install pkg-config
    
    brew install libpng
    pkg-config --cflags libpng
    cpan Imager::File::PNG
    
    brew install jpeg
    pkg-config --cflags libjpeg
    cpan Imager::File::JPEG
    
    brew install giflib
    cpan Imager::File::GIF
    
    GIF: Test code failed: Can't link/include 'gif_lib.h', 'stdio.h', 'errno.h', 'string.h', 'gif'...
    ! Configure failed for Imager-File-GIF-0.98. See /Users/you/.cpanm/work/1713652269.80239/build.log for details.
    
    cd /Users/you/.cpanm/work/1713652269.80239/Imager-File-GIF-0.98
    
    perl Makefile.PL -v --incpath=/opt/homebrew/include --libpath=/opt/homebrew/var/homebrew/linked/giflib/lib
    
    make
    make test
    make install
    
    For some reason the following didn't work with the cpan client:
    o conf makepl_arg "LIBS=-L/opt/homebrew/var/homebrew/linked/giflib/lib INC=-I/opt/homebrew/include"
    
    PS - pkg-config can't find giflib so the paths were found like this:
    sudo /usr/libexec/locate.updatedb
    
    locate giflib
    /opt/homebrew/var/homebrew/linked/giflib
    
    locate gif_lib.h        
    /opt/homebrew/Cellar/giflib/5.2.1/include/gif_lib.h
    /opt/homebrew/include/gif_lib.h
    
CPAN autobundle fail in Meditations
2 direct replies — Read more / Contribute
by Anonymous Monk
on Apr 10, 2024 at 13:50
    I was trying to autobundle an old perl setup but cpan was just sitting there failing to contact mirrors (cpanm user so that mirror list was probably ancient). This inspired me to visit https://www.cpan.org/SITES.html where it says www.cpan.org don't do mirrors anymore. Created the autobundle like so:
    cpan -M https://www.cpan.org -a
Fast sliding submatrix sums with PDL (inspired by PWC 248 task 2) in Meditations
5 direct replies — Read more / Contribute
by Anonymous Monk
on Dec 25, 2023 at 19:51
    Task 2: Submatrix Sum Submitted by: Jorg Sommrey You are given a NxM matrix A of integers. Write a script to construct a (N-1)x(M-1) matrix B having elements that are the sum over the 2x2 submatrices of A, b[i,k] = a[i,k] + a[i,k+1] + a[i+1,k] + a[i+1,k+1] Example 1 Input: $a = [ [1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12] ] Output: $b = [ [14, 18, 22], [30, 34, 38] ]

    I tried to crank it up for entertainment -- to solve not "2x2", but arbitrary "WxH" sub-matrices of (relatively) large matrices. Sadly, it was too late into many stupid plots and tables, when I realized, that excessive summation isn't required at all. Sliding (moving) sum (or average, min/max, etc.) is a well known concept -- duh! not to un-educated me, alas. And so maybe "2x2", not "WxH", in the task, was selected not only because PWC tries to accommodate new learners. Anyway, I implemented "sliding submatrix sums" algorithm only at a later stage, in PDL, and didn't "backport" it to pure Perl (nor Pdlpp) because had already been somewhat fed-up with this 248-2, but decided to present sanitized results as a meditation.

PWC 244 task 2 in linear time in Meditations
3 direct replies — Read more / Contribute
by Anonymous Monk
on Nov 27, 2023 at 13:22

    Disclaimer: it's clickbait. The plot is curved, solution isn't linear, despite lack of nested loops, -- but fast.

    Task 2: Group Hero
    Submitted by: Mohammad S Anwar
    
    You are given an array of integers representing the strength.
    
    Write a script to return the sum of the powers of all possible 
    combinations; power is defined as the square of the largest number 
    in a sequence, multiplied by the smallest.
    
    Example 1
    
    Input: @nums = (2, 1, 4)
    Output: 141
    
    Group 1: (2) => square(max(2)) * min(2) => 4 * 2 => 8
    Group 2: (1) => square(max(1)) * min(1) => 1 * 1 => 1
    Group 3: (4) => square(max(4)) * min(4) => 16 * 4 => 64
    Group 4: (2,1) => square(max(2,1)) * min(2,1) => 4 * 1 => 4
    Group 5: (2,4) => square(max(2,4)) * min(2,4) => 16 * 2 => 32
    Group 6: (1,4) => square(max(1,4)) * min(1,4) => 16 * 1 => 16
    Group 7: (2,1,4) => square(max(2,1,4)) * min(2,1,4) => 16 * 1 => 16
    
    Sum: 8 + 1 + 64 + 4 + 32 + 16 + 16 => 141
    
TPF PERL Swag in Meditations
1 direct reply — Read more / Contribute
by Anonymous Monk
on Jan 09, 2023 at 02:42
    I want some swag from The Perl Foundation but the graphics...

    1. They spelled it: PERL
    2. Raptors are extinct.
    3. Raw onions? C'mon!

    I want cool cryptic, like Perl itself:

    $Perl->{5.36}

    Front Back
    #!/usr/bin/perl exit;
    BEGIN{} END{}
    <DATA> __DATA__
    use Perl; $?
    $@% ...
    $_ @_

    Obviously: camel code

Perl::Dist::APPerl - Actually Portable Perl in Perl News
4 direct replies — Read more / Contribute
by Anonymous Monk
on Jan 06, 2023 at 07:34
    "Actually Portable Perl (APPerl) is a distribution of Perl that runs on several x86_64 operating systems (most Unix-like and Windows) via the same binary. It builds to a single binary with perl modules packed inside of it. Cross-platform, single binary, standalone Perl applications can be made by building custom versions of APPerl, with and without compiling Perl from scratch"

  • Perl::Dist::APPerl
  • computoid.com/APPerl/
Double the speed of Imager->setpixel in Meditations
3 direct replies — Read more / Contribute
by Anonymous Monk
on Dec 11, 2022 at 16:49
    My app was taking 5 seconds to generate an image involving about a million calls to Imager->setpixel and this felt way too slow. NYTProf revealed the cause to be expensive sanity checking in Imager.pm at lines 3456 and 3465. Commenting those lines gets me down to 3 seconds and this now feels much less slow:
    sub setpixel { my ($self, %opts) = @_; # $self->_valid_image("setpixel") or return; my $color = $opts{color}; unless (defined $color) { $color = $self->{fg}; defined $color or $color = NC(255, 255, 255); } # unless (ref $color && UNIVERSAL::isa($color, "Imager::Color")) { # unless ($color = _color($color, 'setpixel')) { # $self->_set_error("setpixel: " . Imager->errstr); # return; # } # } unless (exists $opts{'x'} && exists $opts{'y'}) { $self->_set_error('setpixel: missing x or y parameter'); return; } ... } sub _valid_image { my ($self, $method) = @_; ref $self or return Imager->_set_error("$method needs an image object"); $self->{IMG} && Scalar::Util::blessed($self->{IMG}) and return 1; my $msg = $self->{IMG} ? "images do not cross threads" : "empty inpu +t image"; $msg = "$method: $msg" if $method; $self->_set_error($msg); return; }
    Should the next version of Imager have an option to disable global sanity so it can operate almost twice the usual speed?
The new black metacpan (meta::cpan throws away brand) in Meditations
1 direct reply — Read more / Contribute
by Anonymous Monk
on Sep 30, 2022 at 06:15
the distribution is barmy in Meditations
1 direct reply — Read more / Contribute
by Anonymous Monk
on May 21, 2021 at 09:36
    put back the commented away 63 71 and 75 and it looks as we expect(?) - a file of random numbers from the physics wizards is referenced too - put in 27 remove 28
    use strict; use warnings; use List::Util qw(max sample); #use lib '/usr/local/share/perl/5.30.0'; #use Statistics::Basic::Stddev; #installs somewhere?? #use Statistics::Basic::StdDev; use Statistics::Basic qw(:all); use File::Slurp; #for large list of real randoms my @rands = read_file('../stats/bytes37Mb.txt'); my ($fertilewomen) = @ARGV; my @maxxes; my $cyclelength = 32; #my $duration = int(rand(1) + 0.5) == 1 ? 4 : 5; #my $duration = sample 1, (4, 5); $fertilewomen ||= 48; #print "duration is $duration\n"; #my @women; #for (1..100) { my @women; # for (1..48) { for (1..$fertilewomen) { # my $start = int(rand(31) + 0.5); # my $start = int(rand($cyclelength-1) + 0.5); # my $start = int(rand($cyclelength)); my $start = getrandom($_); # print "$start\n"; # my $range; # my $turnover = $cyclelength - $duration; # if ($start > 28) { # if ($start > $turnover) { # if ($start == 29) { # if ($start == $turnover+1) { # $range = [$start, $start+1, $start+2, 0]; # } elsif ($start == 30) { # } elsif ($start == $turnover+2) { # $range = [$start, $start+1, 0, 1]; # } else { # $range = [$start, 0, 1, 2]; # } # } else { # $range = [$start..$start+3]; # } # push @women, $range; # my $duration = sample 1, (4, 5); my $duration = 4; push @women, $start..($start+$duration-1); } my %count; my %mcount; for my $woman (@women) { # my @range = @{$woman}; # for (@range) { # my $moduluscyclelength = $_ % $cyclelength; my $moduluscyclelength = ($woman % $cyclelength); #print $moduluscyclelength, ' ', $woman, ' ', $cyclelength, "\n"; # $count{$_}++; $mcount{$moduluscyclelength}++; # $count{$woman}++; # } } my %occupancy; # for (0..31) { for (0..$cyclelength-1) { # my $value = exists $count{$_} ? $count{$_} : 0; my $mvalue = exists $mcount{$_} ? $mcount{$_} : 0; # $occupancy{$_} = $value; print "$_ $mvalue\n"; # print "$_ $value $mvalue\n"; } # print 'mean is ', mean(values %count), "\n"; # print 'sd is ', stddev(values %count), "\n"; # my %ostats; # for (values %occupancy) { # $ostats{$_}++; # } # for (sort { $a <=> $b } keys %ostats) { ## print $_, ' ', $ostats{$_}, "\n"; # } # push @maxxes, max(keys %ostats); #} #print join ' ', sort { $a <=> $b } @maxxes; sub getrandom { my $index = shift; my $byte = $rands[$index]; chomp $byte; return int($byte/8); }
When Perl saved the day (and Python couldn't) in Meditations
3 direct replies — Read more / Contribute
by Anonymous Monk
on Aug 28, 2020 at 15:59

    Yes, I know this is not a place to rant, nor is this place to talk bad about other languages, but heck, I am going to rant anyways....

    So I started my scripting journey (short and irregular) with Perl. It enabled me to write scripts pretty fast with least knowledge of the language in particular and programming in general. Job requirements made me take a long break from Perl and Scripting. I started learning Python, not because I had to write scripts, but to "check mark" a training requirement. It's a good language, nothing against it. I was happy on the learning journey, until a requirement came up to automate some alerts and that is when my troubles started.

    The client for which I was to do the automation has strict internet access policies, so no access to the internet from the servers used for environment management. Also, no admin access. I had promised to automate some stuff (my bad, I should have first checked the requirements). Python would not install, not even within the directories for my account. I was at wit's end. I tried downloading again thinking may be the file got corrupted, but same result. My colleague managed to install it for his servers (different client) but kept getting errors while trying to send out emails. So we both were kind of upset and pissed off.

    And then I remembered, Strawberry Perl. Downloaded it, pushed the installer to the servers (Yes, I again had to raise a request for that as well, and no they would not allow any special permissions). To my amazement, it installed without any errors!!. And every conceivable module I wanted was there!!

    This was two days ago...just now finished writing the scripts, sent a test email to myself, then sent it to the required DL Email. Informed my manager and the concerned client folks and they were all happy!!

    Now for my colleague, he too installed the same, I helped him out with the scripts, and I dunnowhathappened, but the emails just worked with Perl. Yeah this sounds stupid, but it didnt work with Python, but , it worked with Perl!!

    Also I found that, for Perl, there are two kind of Email Modules, Ones that "create"/"format" Email and the others you use to "send" emails. Some modules may have both, and I could be wrong, but what I really liked is the modularity given here.

    May be I did something wrong while trying to install Python, may be not, I am not sure. May be I was stupid. But, end of the day, it was Perl that saved the day.

    So thank you Perl, Thank you Perl Developers and especially Strawberry Perl Team for saving the day.

    Rant Over.

Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Chatterbox?
and the web crawler heard nothing...

How do I use this?Last hourOther CB clients
Other Users?
Others meditating upon the Monastery: (7)
As of 2024-04-25 08:29 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found