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MathGroup Archive 2004

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Re: Solve bug?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg52765] Re: [mg52705] Solve bug?
  • From: yehuda ben-shimol <benshimo at bgu.ac.il>
  • Date: Mon, 13 Dec 2004 04:21:59 -0500 (EST)
  • References: <200412100123.UAA18967@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Your problem is working fine (version 5.0.0) with the result of

{{x -> 27.25\[InvisibleSpace] - 2.62145 \[ImaginaryI], y ->
        53.125\[InvisibleSpace] - 19.0842 \[ImaginaryI]}, {x ->
      27.25\[InvisibleSpace] + 2.62145 \[ImaginaryI], y ->
        53.125\[InvisibleSpace] + 19.0842 \[ImaginaryI]}}
yehuda


paul at selfreferral.com wrote:

>Solve seems to be returning an invalid answer when I do this:
>
>c1 = (-50 + x)^2 + (-50 + y)^2 == 156.25
>c2 = (-4.5 + x)^2 + (-56.25 + y)^2 == 156.25
>
>Solve[{c1,c2}]
>{{x -> 16, y -> 43.75}, {x -> 84, y -> 43.75}}
>
>This answer is so wrong!!??
>Those two points are completely off. Not even close.
>
>c1 and c2 are the equations of two overlapping circles.
>Use ImplicitPlot to verify this fact.
>Why can't Mathematica resolve this simple sytem of equations correctly?
>
>If I am doing something wrong please tell me what it is.
>
>Also how can I cut and paste text from a mathematica notebook without
>getting all the slashes?
>Your help is greatly appreciated.
>
>Regards,
>Paul
>
>  
>


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