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Re: why does it still running?!
*To*: mathgroup at smc.vnet.net
*Subject*: [mg113162] Re: why does it still running?!
*From*: Bob Hanlon <hanlonr at cox.net>
*Date*: Sat, 16 Oct 2010 13:10:27 -0400 (EDT)
*Reply-to*: hanlonr at cox.net
Works fine on my system
$Version
"7.0 for Mac OS X x86 (64-bit) (February 19, 2009)"
eqns = ((1 - a)*x - b)/a^(i/1) ==
((1 - a)*y - b)/a^(j/1) &&
j == 10;
Timing[soln = {Reduce[eqns, {y},
Backsubstitution -> True] //
ToRules}]
{0.312331, {{j -> 10, a -> 1, b -> 0}, {j -> 10,
y -> -((a^-i (-a^10 b + a^i b + a^10 x - a^11 x))/(-1 + a))}, {j ->
10, a -> 1}}}
eqns /. soln // Simplify
{True, True, True}
Bob Hanlon
---- olfa <olfa.mraihi at yahoo.fr> wrote:
=============
Hi Mathematica community,
why Mathematica still running and so can't give me a solution for this system
Reduce[
((1 - a)*x - b)/a^(i/1) == ((1 - a)*y - b)/a^(j/1) && j == 10,{y},
Backsubstitution -> True]
Thank you very much.
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