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Re: how to solve a "symbolic" system equation


From: Thomas D. Dean
Subject: Re: how to solve a "symbolic" system equation
Date: Fri, 17 Jul 2015 12:20:56 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0

On 07/17/15 11:46, Doug Stewart wrote:
clear
syms a b
c= 2*a
d=a/b
e=b+d^2
eq1=b==c+3*d
eq2=e==2*c
[c1 c2]=solve(eq1,eq2,c,d)


I have something set wrong! Any ideas?

octave:300> [c1 c2]=solve(eq1,eq2,c,d)
c1 = (sym 2Ã1 matrix)

  â¡        _______    â¤
  â¢b + 3â
â²â± b + 9  + 9â¥
  ⢠                  â¥
  ⢠       _______    â¥
  â£b - 3â
â²â± b + 9  + 9â¦

c2 = (sym 2Ã1 matrix)

  â¡    _______    â¤
  â¢- â²â± b + 9  - 3â¥
  ⢠              â¥
  ⢠  _______     â¥
  ⣠â²â± b + 9  - 3 â¦

octave:301>
octave:301> version
ans = 4.1.0+

Tom Dean



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