Posted by Ion Saliu on July 10, 2001.
In Reply to: Find the index of a lotto combination and vice versa posted by Ion Saliu on July 07, 2001.
• New version: 1.1, July 10, 2001.
Apparently, the first version of the lexicographic algorithm caused some errors on some PCs. There was a DOS configuration conflict. Probably the new version will be error-free. It is recommended to run the program at the DOS (command) prompt, not inside Windows.
There is another change in NTHINDEX. The new default for option: “Find Combination of Index L” is ‘the half point of total combinations in the lotto set’. For example, the ‘half point’ in a lotto 49/6 game is 6991908 (13983816 / 2). The corresponding combination is: 6-7-16-28-48. Check it out, if you play a 49/6 lotto game. In a PowerBall 49/5/42 game, the ‘half point’ is 40044564; the corresponding combination is: 7-8-28-30-46;42.
One more “point”: type the index without commas or dots! You get an error if you type the index as 40,044,564 or 40.044.564.
Other changes to the program in the form of ‘customizations’ are not available at this time.
This is a comprehensive list of my writings on the topic of lexicographical order or indexing, including algorithms and software.
The following are older and somehow outdated materials I wrote on lexicographical order subjects. Most of the older software is outdated. Nothing (in the whole world) can beat LexicographicSets or DrawIndex. Sentimentalism is good only to a close extent.
Of course, everybody loves to feast on great software, especially when it is free! My combinatorics software (and other categories) is absolutely free to run, for an unlimited period of time. However, only the registered members have a right to download the software. Membership requires a nominal fee — the most reasonable there is to connect to the greatest and most useful software ever created. No kidding! Read the conditions to becoming a registered member: Download Great Free Software: Paid Membership Required.