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Lexicographical Order, Index, Rank of Permutations, Combinations ~
Original Software, Algorithms to Calculate Lexicographic Order or Generate Combination from Index

By Ion Saliu, Seeker of Order in Chaos

Calculate lexicographic order in permutations, combination, combinations, combinatorics, sets.

I. The Best Software to Find the Lexicographic (or Lexicographical) Index
II. Types of Sets and Their Lexicographical Ordering
III. Analysis of Lexicographical Order, Indexing, Ranking
IV. Resources in Lexicographic Order, Formulas, Algorithms, Software

Get software to find the lexicographic order, rank, index, numeral of permutations, combinations.

LexicographicSets.exe ~ Combinatorics software.

1. The Best Software to Find the Lexicographic (or Lexicographical) Index — and vice versa

LexicographicSets.EXE is the summit of all lexicographic . . . make it lexicographical ordering. The program finds (calculates) the index, or order, or rank, or numeral of all types of sets: exponents, permutations, arrangements, and combinations, including Powerball. Conversely, the program finds (constructs) the set for a given index, or order, or rank, or numeral. The sets are considered in sequential, or lexicographic (lexicographical), or dictionary order.

Science Software: Statistics, Probability, Odds, Combinatorial Mathematics, Algorithms.

Any finite number of elements can be put together in groups based on certain rules. Such groups are known as sets.

  • There are four distinct types of sets, from the most inclusive to the least inclusive: exponents, permutations, arrangements, combinations.

    We know very well now how to calculate all possible elements in every type of numerical sets. We can also write software to generate all possible elements in every type of sets: Combinatorics or Mathematics of Exponents, Permutations, Arrangements, Combinations. I am the author of such incredible software: PermuteCombine.exe. It is well-known all over the world, especially for its uniqueness. It is the universal calculator and generator for exponents, permutations, arrangements and combinations. The generation can be set for any numbers or words. As of this time of writing (2009), no other piece of software can do what PermuteCombine can perform.

    So, we want to generate all combinations in that lotto game where they draw 6 winning numbers from a field of 49. We can set a program such as Permute Combine to generate all possible combinations in the game (set). If the program is well-written and accurate, it should generate 13,983,816. The generating process will start with this typical combination:
    1, 2, 3, 4, 5, 6.
    The generating will end with this combination:
    44, 45, 46, 47, 48, 49.

    We can see that the combinations are generated sequentially, or in lexicographic (lexicographical) order, from the 1st sequence (CSN) to the last.

    There are situations when generating all the elements in a set and counting them, and then looking for a particular element is not an efficient process. We can see very easily what the first element in a combination set is, without complex calculations or algorithms.

    The combination 1 2 3 4 5 6 comes to mind automatically in the case of a lotto 6–from-49 game (any 6-number lotto game, actually). Also easy: What is the combination of lexicographical order (or index, or rank) 13983816 in a lotto 6–of-49 game? Answer: 44, 45, 46, 47, 48, 49.

    But how about index (or numeral orders) such as 77889, or 1000000, or 6991908? The index #6,991,908 is right in the middle of the set. It is represented by the lotto 6-49 combination 6 7 16 20 28 47.

    The calculations are instantaneous with my own program LexicographicSets. The software is founded on some known algorithms, released in the public domain, and mostly on my own algorithms.

    Study types of sets and their specific lexicographic, lexicographical order with formulas, software.

    2. Types of Sets and Their Lexicographic (or Lexicographical) Indexing

    The pick-3 or pick-4 lottery games are the most commonly known examples of exponents. Each digit of the pick games takes values between 0 and 9 (10 values). The pick-3 game has a total of 10 to the power of 3 (10 ^ 3) = 1000 straight sets.
    The soccer pools, such as totocalcio, have 3 outcomes for 13 games; 3 to the power of 13 (3 ^ 13) = 1,594,323 possibilities.
    The parameters for soccer pools (totocalcio) are: 13 (items per set), 0 (lower bound), 2 (upper bound). 1 represents home victory, 2 is for win for the visitor, and 0 stands for a tie. The pick-3, pick-4 games have a lower bound of 0, and an upper bound of 9. Items per set: 3 (in pick-3) and 4 (in pick-4).
    The exponents grow much faster than anything else, including permutations!

    Apply lexicographic ordering, ranking to the exponential sets or exponents.

    The permutations are also known as factorial, as far as calculation is concerned. Factorial of N or N! = 1 x 2 x 3 x … x N. The factorials grow extremely rapidly.

    The permutations can be ordered or ranked in lexicographical mathematics with algorithms.

    The arrangements of N elements taken M at a time are calculated as N x (N-1) x (N-2) x (N-M+1). The exactas (top two finishers), or trifectas (top three finishers), or superfectas (top four finishers) in horse racing are some of the most common representations of the arrangements.

    Lexicographical order for arrangements is applied in horse racing.

    The combination formula is: Combinations (N, M) = Arrangements (N, M) / Permutations (M).

    The combinations are the best-known element of the four mathematical entities. The lotto draws are some of the most common representations of the combinations. The software also covers Powerball-type of combinations; i.e. the last number (the 'power ball') can be equal to any of the previous numbers in the combination.

    Lexicographical order of lotto combinations are the most popular algorithms.

    There are special lottery games: Powerball, Mega Millions, Euromillions. They are most accurately defined as two-in-one games. The numbers drawn from the second chamber can be equal to any of the numbers drawn in the first set. The lexicographical order algorithms are based on the one-set lotto games, but there are subtle (and difficult-to-program!) disferrences. Here is a screenshot for the Powerball game (Mega Millions is similar):

    Powerball, Mega Millions lexicographical algorithms are unique to Ion Saliu.

    And here is a screenshot for the Euromillions game played in several European countries:

    Euromillions combinations lexicographic algorithm was discovered by Ion Saliu.

    Read the best introductory analysis of lexicographical order in combinatorics.

    3. Analysis of Lexicographic (or Lexicographical) Order and Indexing

    The first algorithm applied to the numerical sets known as combinations. The lexicographic order algorithm was developed by B. P. Buckles and M. Lybanon to determine the combination for a given rank (index or lexicographic order). The algorithm is included in the Association for Computing Machinery (ACM algorithm #515, published in 1977). In 2001 I discovered the opposite algorithm: Calculate the lexicographical order when the combination is given.

    Then, I applied both types of algorithms to all four types of sets: exponents, permutations, arrangements, and combinations. I developed the combinations sets to further dimensions, by creating lexicographic algorithms for two-in-one phenomena (such as Powerball lotto). To this date and my best knowledge, I am the only author of algorithms for lexicographic ordering for all four numeric sets, plus Powerball, Mega Millions, and Euromillions.

    This function, present in the modules of all four types of sets, finds the rank (or index) for a given set (e.g. combination):

    The first lexicographical algorithm finds the rank for a given combination, permutation.

    This function reverses the task above and finds the set (e.g. combination) for a given index (or rank) :

    The second lexicographic algorithm finds the combination for a given order, index.

    Publishing and analyzing the algorithms are tasks beyond the scope of this book. Again, my website is open for business, including in this field. A simple search would lead to many resources at SALIU.COM, including the one-of-a-kind software (nowhere else to be found).

    The lexicographical order is very important, however. We notice the case of lotto games, where most combinations appear to be truly random to laypersons. They assess that a combinations like 6-7-16-20-28-47 appears to be truly random. On the other hand, the infamous combination 1-2-3-4-5-6 doesn't appear to be truly random; it appears to be strongly ordered.

    In fact, the determining factor is the standard deviation. I call standard deviation the watchdog of randomness. The extremes of the set (the beginning and the end) have combinations with very low standard deviations. Meanwhile, combinations with higher lexicographic orders (ranks, indexes) come from the inside of the set; their standard deviation is closer to the median. The common perception is that the higher the standard deviation the more random a combination is!

    Searching on lexicographical, lexicographic, sets, permutations, combinations, etc. etc. yields probably over 100,000 unique search hits! It's a huge mess! Tons of algorithms and source code in every imaginable programming language! I couldn't go too far. I saw newsgroups postings from the early 1980's. It didn't look to me that the issue was ever solved. I mean, I couldn't find the "mother of all sets generating"; or the "mother of all lexicographical indexes"! That finding corroborates with the requests I received to write specific lexicographical indexing and generating software. I was unable to find comprehensive software to tackle sets generating and lexicographic indexing.

    I know, the Internet is of gigantic proportions. I assume, however that the two programs I wrote represent the most comprehensive answer to sets generating and lexicographic indexing. The accuracy is also a very important issue. From what I was able to read, there has been a lot of bickering in the newsgroups. It appears that many attempts to tackle the job resulted in faulty algorithms and/or software. I can guarantee that my (comprehensive) software is fault-free to a very high degree. I haven't been able to find a wrong result in quite a few tries.

    Speed of execution is also a very important issue. The combinations functions are as fast as it gets. The exponential functions are also close to as fast as it gets. The arrangements functions are slower. The permutations functions are the slowest. I have multiple methods at my disposition. I chose the most accurate ones. Given time, I may come back and insert faster methods. For now, accuracy comes first and second. Speed comes in the third place.

    The saying goes that the universities make public the algorithms and source code. Therefore I should make my stuff public, too. Well, the universities are funded. I am not a university and am not funded. Nevertheless, I offer a lot of free software of my own, probably more freeware than most universities.

    You find here essential resources in applying lexicographical order of combination sets to life.

    4. Essential Resources in Lexicographic (or Lexicographical) Order and Indexing, Algorithms, Software

    Theory of Probability book is founded on discoveries in combinatorics of lexicographic ordering. Read Ion Saliu's first book in print: Probability Theory, Live!
    ~ Founded on valuable mathematical discoveries with a wide range of scientific applications, including the organic connection between probability theory and lexicographical ordering of numerical sets or word sets.

    Start here mathematics of lexicographic, lexicographical order, index, ranking, indexing.

    Resources in Theory of Probability, Mathematics, Combinatorics, Lexicographic Order, Software

    See a comprehensive directory of the pages and materials on the subject of theory of probability, mathematics, lexicographical order, combinatorics, plus software.

    This is the best textbook in mathematics of combinatorics or lexicographical ordering, ranking.

    Combinatorial software finds the order and generates combinations from lexicographic index.

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