managing order of magnitude instead of numbers

*To*: mathgroup at smc.vnet.net*Subject*: [mg56672] managing order of magnitude instead of numbers*From*: foice <foice@N0NSPAMMAR&tiscali.it>*Date*: Tue, 3 May 2005 05:26:23 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

i need to make calculation without specifing the exact values of my parameters, i want only to specify their order of magnitude. obviously i need only order of magnitudes as result. now the problem is that O(1) - O(1) = O(1) while 1-1 = 0 so it's clear i cannot use numbers to make this "order of magintude calculation" at the present stage i let mathematica do the calculation in a fully simbolic way and then, by hand calculation, i get my result by susbstitution of the order of magnitudes in place of the symobls used. making a very simple example: i ask to mathematica to do a - b and then i substitute a=O(1) b=O(0.002) and calculate a - b = O(1) in this way i'm making operation between magnitues not values, but i have to do it on my own, while doing calculation with mathematica will be much better. is there any way to make calculation betwwen order of magnitues instead of between numbers? thanks. roberto.

**Follow-Ups**:**Re: managing order of magnitude instead of numbers***From:*Chris Chiasson <chris.chiasson@gmail.com>