RE: Confusion between rules and variables
- To: mathgroup at smc.vnet.net
- Subject: [mg42420] RE: [mg42416] Confusion between rules and variables
- From: "John C. Erb, Ph.D." <John_C_Erb at prodigy.net>
- Date: Sun, 6 Jul 2003 06:57:03 -0400 (EDT)
- Organization: John C. Erb, Ph.D.
- Reply-to: <John_C_Erb at prodigy.net>
- Sender: owner-wri-mathgroup at wolfram.com
An example using ReplaceAll
Ans = x/.Solve[x^2-1\==0,x]
which gives {-1,1}
You can then use
x1 = ans[[1]]
x2 = ans[[2]]
John C. Erb
-----Original Message-----
From: Jonathan Greenberg [mailto:greenberg at ucdavis.edu]
To: mathgroup at smc.vnet.net
Subject: [mg42420] [mg42416] Confusion between rules and variables
I ran a FindRoot where the output was {x->0.543} -- How do I extact that
value (0.543) for use in some other equation (e.g. How do I set a
variable
equal to 0.543, instead of that entire rule)?
--j