Pattern Matching

*To*: mathgroup at smc.vnet.net*Subject*: [mg58215] Pattern Matching*From*: "Jeff" <jmcolon at gmail.com>*Date*: Thu, 23 Jun 2005 05:33:51 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

Given a list of numbers, t = {0, -1, 0, -1, -2, -3, -4,-3,-4,-5}, I would like to extract those numbers that are less than or equal to the starting value by, for example, at least 2, but once the first (and each subsequent) match is found, I would the starting value to drop by 2. So for the list t, the output would be {-2, -4}. I can use Cases or map using If[ ] on the list to extract those elements that are less than or equal to -2, but I'm having difficutly in figuring out how to change the starting value to be applied to subsequent elements of the list. Given my example, I could just extract all the multiples of 2 in the list, but I would like the starting value to change by a fixed percentage or combination of fixed number and percentage. Thanks, Jeff

**Follow-Ups**:**Re: Pattern Matching***From:*Daniel Lichtblau <danl@wolfram.com>