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Groups > comp.soft-sys.math.mathematica > #2763
| From | ferradini <gianmarco.ferradini@email.it> |
|---|---|
| Newsgroups | comp.soft-sys.math.mathematica |
| Subject | how to calculate an index and vice versa |
| Date | 2011-05-28 11:20 +0000 |
| Organization | Steven M. Christensen and Associates, Inc and MathTensor, Inc. |
| Message-ID | <irqlpg$e9a$1@smc.vnet.net> (permalink) |
given n numbers (eg. 1 to 90) I can build the following list of numbers k (in this case 4) 1, 2, 3, 4 associated index -> 0 1, 2, 3, 5 associated index -> 1 1, 2, 3, 6 associated index -> 2 1, 2, 3, 7 associated index -> 3 1, 2, 3, 8 ................... .... 1, 2, 3, 9 ....................... ....................... ....................... 10, 41, 60, 61 associated index -> 954722 ....................... ....................... 87, 88, 89, 90 associated index -> 2555190 I need to build an algorithm to assign eg 4 elemnti can obtain its index in the list (1, 2, 3, 7 return 3) The second algorithm is 'inverse: given a number such as 954722 I get the four elements 87; 88, 89, 90. The elemnti in the list are always sorted values. I thank those who will send me information on the subject to follow Thank ferradini
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how to calculate an index and vice versa ferradini <gianmarco.ferradini@email.it> - 2011-05-28 11:20 +0000 Re: how to calculate an index and vice versa Ray Koopman <koopman@sfu.ca> - 2011-05-29 11:36 +0000
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