RE: List Manipulation
- To: mathgroup at smc.vnet.net
- Subject: [mg72432] RE: [mg72407] List Manipulation
- From: "David Park" <djmp at earthlink.net>
- Date: Wed, 27 Dec 2006 06:27:23 -0500 (EST)
Two methods...
list = {a1 + b1*k, a2 + b2*k, a3 + b3*k};
{Alist, Blist} = list /. a_ + b_ k -> {a, b} // Transpose
{{a1, a2, a3}, {b1, b2, b3}}
{Alist, Blist} = CoefficientList[#, k] & /@ list // Transpose
{{a1, a2, a3}, {b1, b2, b3}}
David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/
From: Stratocaster [mailto:stotz1 at verizon.net]
I'm not sure if the following is possible or whether it exists somewhere
between the realms of fantasy and science fiction. I have been unable to do
it.
Given a list, set, vector (whatever you want to call it) consisting of
functions of the same variable, i.e.
list = {a1+b1*k, a2+b2*k, a3+b3*k...}
Assuming they are all linear (of the form a+b*k) is there away to isolate
the a_i and b_i values? Essentially I would like to get a list "A"
consisting of all the intercept values, and a list "B" consisting of all the
slope values.
Is this possible? What kind of operations do I need to use to accomplish
this (if indeed it is possible)?
Thanks for any insights.