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MathGroup Archive 2006

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Re: Problems solving using Solve

  • To: mathgroup at smc.vnet.net
  • Subject: [mg68844] Re: Problems solving using Solve
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
  • Date: Mon, 21 Aug 2006 03:27:43 -0400 (EDT)
  • Organization: The Open University, Milton Keynes, UK
  • References: <ec65bn$1f8$1@smc.vnet.net> <ec97uf$4er$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

akil wrote:
> definition for cd is cd[input_,rcCD_,cx_,cy_] := rcCD*input + cy - rcCD*cx; 
> (which just defines a line of the form y=ax+b)
> 
> Using NSolve instead of Solve still takes way too long (quit it after 15 
> minutes, do not know if it even will solve it). I have about a 100 cones for 
> each part I need to test and the way it is now takes too long.
> 
> In my usage all values except beta and v are Reals. Beta is usually the 
> range [0, Pi/2] and v is also a Real.
> 
> For a solvable solution try:
> 
> {ax,ay}= {7,4} and {cx,cy}= {21,11} and
> {centerOfMassx,centerOfMassy}={13,7} and rcAB=3 and
> rcCD=7/4
> 
> That should give a solution, and quite fast at that.

No: the definition of the function 'ab' is missing.

Jean-Marc


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