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Re: Assigning (really dumb question)
 To: mathgroup at smc.vnet.net
 Subject: [mg60993] Re: Assigning (really dumb question)
 From: "JensPeer Kuska" <kuska at informatik.unileipzig.de>
 Date: Fri, 7 Oct 2005 03:37:39 0400 (EDT)
 Organization: Uni Leipzig
 References: <di2ml8$8h0$1@smc.vnet.net>
 Sender: ownerwrimathgroup at wolfram.com
Hi,
Solve already return a list of replacement rules
and
r[q] /. qa
instead of
r[q] /. q>qa
should work.
Regards
Jens
<vjp2.at at at.BioStrategist.dot.dot.com> schrieb im
Newsbeitrag news:di2ml8$8h0$1 at smc.vnet.net...
 What the heck am I doing wrong? I've been away
from Mathematica for a while.

 I can't get it to evaluate the expressions at
the solved values.

 I feel so stupid.

 r[q_] := 1800 q  .006 q^2
 c[q_] := 12100000 + 800 q + .004 q ^2

 qa = Solve[ D[ r[q]c[q] , q] == 0, q]
 r[q] /. q > qa
 c[q] /. q > qa
 r[q]c[q] /. q > qa
 D[r[q],q] /. q > qa
 D[c[q],q] /. q > qa

 qm = Solve[ c[q]/q  D[c[q] , q] == 0, q] [[2]]
 r[qm] /. q > qm
 c[qm] /. q > qm
 r[qm]c[qm] /. q > qm
 D[r[q],q] /. q > qm
 D[c[q],q] /. q > qm


 (PS, a while back I was asking how to fix DOS
2.2.2 when it wasn't
 doing graphics and I was told it was no longer
supported. Well, 2yrs
 later, dumbo me, realised I just had to cd into
the math directory and
 all was fine.)


  = 
 VasosPeter John Panagiotopoulos II,
Columbia'81+, Bio$trategist
 BachMozart ReaganQuayle EvrytanoKastorian

http://ourworld.compuserve.com/homepages/vjp2/vasos.htm
 {Nothing herein constitutes advice.
Everything fully disclaimed.}
 [Homeland Security means private firearms not
lazy obstructive guards]
 [Fooey on GIU,{MS,X}Windows 4 Bimbos] [Cigar
smoke belongs in veg food group]

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