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ratnz: Solve

  • To: mathgroup at smc.vnet.net
  • Subject: [mg122027] ratnz: Solve
  • From: Themis Matsoukas <tmatsoukas at me.com>
  • Date: Sun, 9 Oct 2011 03:54:01 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com

I am solving these two equations:

equations = {
  2721. == 2582.9 (1 - a) (1 - b) + 2580.1 a (1 - b) + 2968.3 (1 - a) b + 2967.7 a b, 
   1.95 == 1.9367 (1 - a) (1 - b) + 1.2856 a (1 - b) +  3.1027 (1 - a) b + 2.0671 a b};

When I use Solve[equations, {a, b}] I get the  message 

Solve::ratnz: Solve was unable to solve the system with inexact coefficients. The answer was obtained by solving a corresponding exact system and numericizing the result. >>

but when I use Solve[equations] there's no such message.  In both cases I get the same solution:

{{a -> -120.403, b -> -1.65149}, {a -> 0.516063, b -> 0.361015}}

What is Mathematica trying to tell me?

Thanks

Themis



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