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FindCurvePath has a problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg127364] FindCurvePath has a problem
  • From: Ralph Dratman <ralph.dratman at gmail.com>
  • Date: Fri, 20 Jul 2012 03:50:32 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • Delivered-to: mathgroup-newout@smc.vnet.net
  • Delivered-to: mathgroup-newsend@smc.vnet.net

The following input to FindCurvePath produces the output shown below it:

FindCurvePath[{{278,141},{279,141},{279,142},{279,143},{280,143},{280,144},
{280,145},{280,146},{281,147},{281,148},{281,149},{281,150},{282,150},{282,
151},{282,152},{283,151},{283,152},{283,153},{284,153},{284,154},{285,155},
{286,155},{286,156},{287,156},{287,157},{288,157},{289,156},{290,156},{290,
157},{291,156},{291,157},{292,156},{292,157},{293,156},{293,157},{294,156},
{294,157},{295,156},{295,157},{296,156},{296,157},{297,156},{297,157},{298,
155},{298,156},{299,155},{299,156},{300,155},{301,154},{301,155},{302,153},
{302,154},{303,152},{303,153},{304,150},{304,151},{304,152},{305,149},{305,
150},{306,146},{306,147},(*{306,148},{306,149},{307,144},{307,145},{307,146
},{308,141},{308,142},{308,143},{308,144},{309,139},{309,140},{309,141},{31
0,138},{310,139},{311,136},{311,137},{311,138},{312,135},{312,136},{313,134
},{313,135},*){314,133},{314,134}}]
FindCurvePath::ntri:    The data generates an inconsistent
triangulation. You can perturb the data to make it valid. >>
Fail

If you restore the commented-out list elements (beginning with
(*{306,148}...), then evaluate, you get an apparently never-ending
silent hangup, which is of course far worse than an error message.

I have not yet tried to "perturb" anything to work around the problem.
Clearly the function needs to check its arguments before wandering off
into lala land.


Ralph Dratman



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