FindInstance puzzler
- To: mathgroup at smc.vnet.net
- Subject: [mg83633] FindInstance puzzler
- From: Mark Fisher <particlefilter at gmail.com>
- Date: Mon, 26 Nov 2007 03:49:26 -0500 (EST)
Hi all,
I'm puzzled by the results of FindInstance which seems to restrict its
results to a subregion of the valid space.
conds = And @@
Append[Thread[(Abs[L] /. Solve[1 - z1 L - z2 L^2 == 0, L]) >= 1],
z1 + z2 >= 0];
RegionPlot[conds, {z1, -.75, 2.25}, {z2, -1.25, 1.25}, PlotPoints ->
90,
Epilog -> Point[{z1, z2} /. FindInstance[conds, {z1, z2}, Reals,
10^3]]]
I suppose this isn't a bug, because the results of FindInstance are
all valid, but nevertheless I find it unpleasing (to say the least)
that part of the valid space seems to get no representation. It means
that FindInstance is of limited use for exploring such spaces.
--Mark
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- Re: FindInstance puzzler
- From: Andrzej Kozlowski <akoz@mimuw.edu.pl>
- Re: FindInstance puzzler