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MathGroup Archive 2005

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(Mis)Behavior of Solve

  • To: mathgroup at smc.vnet.net
  • Subject: [mg62684] (Mis)Behavior of Solve
  • From: "DOD" <dcodea at gmail.com>
  • Date: Wed, 30 Nov 2005 22:08:49 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

When I run

\!\(Solve[{P\_InnocentI[4\/5, sI, sG, 1, 1] == 1\/2, P\_InnocentG[4\/5,
sI,
          sG, 1, 1] == 1\/2}, {sI, sG}]\)

(where p_foo are functions defined previously) I get no solution.  But
when I run

\!\(Solve[{P\_InnocentI[.8, sI, sG, 1, 1] == 1\/2, P\_InnocentG[.8, sI,

          sG, 1, 1] == 1\/2}, {sI, sG}]\)

I get a solution.  That is, switching .8 for 4/5 gives me a solution.
What's going on here?  Does Solve care whether I use decimals or
fractions?  I have a more complicated Solve of the same functions, and
now I don't know if there's really no solution, or if Solve is just
misbehaving.  

DOD


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