[DyLP-tickets] [DyLP] #10: Dylp fail on pathological problem

[DyLP]

#10: Dylp fail on pathological problem
-------------------+--------------------------------------------------------
Reporter:  stefan  |       Owner:  lou   
    Type:  defect  |      Status:  new   
Priority:  normal  |   Component:  primal
 Version:          |    Severity:  normal
Keywords:          |  
-------------------+--------------------------------------------------------
 Hi,

 I've started to run some tests again, and DyLP (stable/1.3) seem to fail
 on the problem:
 {{{
   min  0
   s.t. x = 0
 }}}

 Running the attached mps file using DyLP/examples/plain, I get
 {{{

 > ./plain -odsi internalconfusion.mps
 Processing internalconfusion.mps, flags = -t.

 Logging to internalconfusion.mps.log.
 Output file is internalconfusion.mps.out.
 Reading problem file internalconfusion.mps.
 Starting LP.
 inv_create: m = 0; invalid parameter
 }}}

 Running it with the -dylp option, I get
 {{{
 > ./plain -dylp internalconfusion.mps
 Processing internalconfusion.mps, flags = -t.

 Segmentation fault
 }}}

 Running it through GAMS and Osi, I get
 {{{
 add_logical (error): internal confusion, line 717.

 consys_addrow_pk (error): [<<unnamed>>[actv]]: unable to add logical
 variable for
         constraint fakerow (1).

 dy_loadcon (error): could not install constraint
 <<unnamed>>[actv].fakerow.

 cold_loadfull (error): [<<unnamed>>[actv]]: (IN)0: unable to activate
 constraint <<unnamed>>.fakerow (1).

 dy_coldstart (error): [<<unnamed>>[actv]]: (IN)0: unable to load active
 system from <<unnamed>>.

 dylp (error): [<<unnamed>>]: (IN)0: cold start failed.

 add_logical (error): internal confusion, line 717.

 consys_addrow_pk (error): [<<unnamed>>[actv]]: unable to add logical
 variable for
         constraint fakerow (1).

 dy_loadcon (error): could not install constraint
 <<unnamed>>[actv].fakerow.

 cold_loadfull (error): [<<unnamed>>[actv]]: (IN)0: unable to activate
 constraint <<unnamed>>.fakerow (1).

 dy_coldstart (error): [<<unnamed>>[actv]]: (IN)0: unable to load active
 system from <<unnamed>>.

 dylp (error): [<<unnamed>>]: (IN)0: cold start failed.

 add_logical (error): internal confusion, line 717.

 consys_addrow_pk (error): [<<unnamed>>[actv]]: unable to add logical
 variable for
         constraint fakerow (1).

 dy_loadcon (error): could not install constraint
 <<unnamed>>[actv].fakerow.

 cold_loadfull (error): [<<unnamed>>[actv]]: (IN)0: unable to activate
 constraint <<unnamed>>.fakerow (1).

 dy_coldstart (error): [<<unnamed>>[actv]]: (IN)0: unable to load active
 system from <<unnamed>>.

 dylp (error): [<<unnamed>>]: (IN)0: cold start failed.
 }}}

-- 
Ticket URL: <https://projects.coin-or.org/DyLP/ticket/10>
DyLP <http://projects.coin-or.org/DyLP>
An implementation of the dynamic simplex algorithm for LP.