Algorithm::Permute - Handy and fast permutation with object oriented interface
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- A permutation, also called an “arrangement number” or “order,” is a rearrangement of the elements of an ordered list S into a one-to-one correspondence with S itself.
This handy module makes performing permutation in Perl easy and fast, although perhaps its algorithm is not the fastest on the earth. It supports permutation r of n objects where 0 < r <= n.
Returns a permutor object for the given items.
In particular, they are called the permutations of five objects taken two at a time, and the number of such permutations possible is denoted by the symbol 5 P 2, read “5 permute 2.” In general, if there are n objects available from which to select, and permutations ( P ) are to be formed using k of the objects at a time, the number of. Permute 3.5.7 for mac是一款非常方便使用的mac视频转换和mac视频合并软件。只需将想要转换的视频拖入到软件窗口内即可,然后根据需要选择要转换的格式,软件基本上支持当前所有流行的视频格式。.
Returns a list of the items in the next permutation. The order of the resulting permutation is the same as of the previous version of
Algorithm::Permute
.Returns the list of items which will be returned by next(), but doesn't advance the sequence. Could be useful if you wished to skip over just a few unwanted permutations.
Resets the iterator to the start. May be used at any time, whether the entire set has been produced or not. Has no useful return value.
Starting with version 0.03, there is a function - not exported by default - which supports a callback style interface:
A block of code is passed, which will be executed for each permutation. The array will be changed in place, and then changed back again before
permute
returns. During the execution of the callback, the array is read-only and you'll get an error if you try to change its length. (You can change its elements, but the consequences are liable to confuse you and may change in future versions.)You have to pass an array, it can't just be a list. It does work with special arrays and tied arrays, though unless you're doing something particularly abstruse you'd be better off copying the elements into a normal array first. Example:
The code is run inside a pseudo block, rather than as a normal subroutine. That means you can't use
return
, and you can't jump out of it using goto
and so on. Also, caller
won't tell you anything helpful from inside the callback. Such is the price of speed.The order in which the permutations are generated is not guaranteed, so don't rely on it. Apple original product li ion battery.
The low-level hack behind this function makes it currently the fastest way of doing permutation among others.
I've collected some Perl routines and modules which implement permutation, and do some simple benchmark. The whole result is the following.
Permutation of eight scalars:
Permutation of nine scalars (the Abigail's routine is commented out, because it stores all of the result in memory, swallows all of my machine's memory):
The benchmark script is included in the bench directory. I understand that speed is not everything. So here is the list of URLs of the alternatives, in case you hate this module.
- Memoization is discussed in chapter 4 Perl Cookbook, so you can get it from O'Reilly: ftp://ftp.oreilly.com/published/oreilly/perl/cookbook
- Abigail's: http://www.foad.org/~abigail/Perl
- List::Permutor: http://www.cpan.org/modules/by-module/List
- The classic way, usually used by Lisp hackers: perldoc perlfaq4
Permute 2 2 2 7x
In Edwin's words: Yustina Sri Suharini - my ex-fiance-now-wife, for providing the permutation problem to me.
- Data Structures, Algorithms, and Program Style Using C - Korsh and Garrett
- Algorithms from P to NP, Vol. I - Moret and Shapiro
Edwin Pratomo <[email protected]> was the original author.
Permute 2 2 2 7 Setup
Stephan Loyd <[email protected]> is co-maintainer after version 0.12.
The object oriented interface is taken from Tom Phoenix's
List::Permutor
. Robin Houston <[email protected]> invented and contributed the callback style interface.This software is copyright (c) 1999 by Edwin Pratomo.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.
To install Algorithm::Permute, copy and paste the appropriate command in to your terminal.
For more information on module installation, please visit the detailed CPAN module installation guide.
Last Updated on October 12, 2020 by
Permute 2 2 2 7
Developer: Krystof Vasa
Permute is a versatile tool that allows you to convert video, audio and images files into different formats, increase volume, merge them and much more!
Video, audio and image files come in many different kinds and shapes, but sometimes you need a specific format since your iPad or DVD player won’t play that video. That’s what Permute is for!
Here are some key features:
– Beautiful UI – See what you are converting. Waltr 2 6 2010. Permute includes icon view that allows you to see thumbnails of whatever you are working with.
– Easy to Use – What could be easier? Drag & drop a file, select target format and go. That easy!
– Insanely Fast – Permute can utilize as much of your computer as possible to get stuff done ASAP.
– Versatile – Videos, audio, images – Permute can handle it all. Want to create a DVD? No problem, Permute can do that too. With Permute 3.2 or later, you can also convert images into text!
– Customizations – Customize the presets, or just that particular conversion. Increase volume, rotate video, change its resolution, flip it and so on!
What’s new in Permute
Size 47.2 MB
Compatibility OS X 10.11 or later, 64-bit processor
Languages English, Belarusian, Czech, French, German, Italian, Portuguese, Russian, Simplified Chinese, Spanish, Swedish, Ukrainian
Copyright © 2018, Charlie Monroe Software