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MathGroup Archive 2004

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AW: How to extract a solution from Mathematica's answer to "Solve"

  • To: mathgroup at smc.vnet.net
  • Subject: [mg49383] AW: [mg49363] How to extract a solution from Mathematica's answer to "Solve"
  • From: Matthias.Bode at oppenheim.de
  • Date: Sat, 17 Jul 2004 06:38:48 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Hi Rainer,

I apologize for the typo in line 3(the cut & paste curse):

sol = Solve[x^2 - 6*x - 16 == 0, x]
sol01 = sol[[1,1,2]]
sol02 = sol[[2,1,2]]

Best regards,
Matthias Bode
Sal. Oppenheim jr. & Cie. KGaA
Untermainanlage 1
D-60329 Frankfurt am Main
GERMANY
Tel.: +49(0)69 71 34 53 80
Mobile: +49(0)172 6 74 95 77
Fax: +49(0)69 71 34 95 380
E-mail: matthias.bode at oppenheim.de
Internet: http://www.oppenheim.de



-----Ursprüngliche Nachricht-----
Von: wilhelm.rainer at gmx.net [mailto:wilhelm.rainer at gmx.net] 
Gesendet: Freitag, 16. Juli 2004 12:07
An: mathgroup at smc.vnet.net
Betreff: [mg49363] How to extract a solution from Mathematica's answer to
"Solve"


I have a question concerning the Solve command. Assume I have solved
an equation using Solve. Mathematica returns the solutions in the
following form (example for 2 solutions):

{{x->-2}, {x->2}}

Now, assume I wish always to pick the first of these two solutions and
store it in a variable (to be able to continue working with it in the
Notebook). Is there a command to "extract" the second solution and to
store it in a variable. Since the response is in a form of a matrix
{{...},{...}}, I have tried things like MySolution = %[[1]], but it
always fails.

I appreciate any helpful commands!
Thanks
Rainer


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