Re: [Help-glpk] Unreferenced Out of Domain Error

[Andrew Makhorin]

> Thanks for your response.
> I entered the debugging statement you suggested; the triplet
> (314,2,17) does not get printed, but an attempt is still made to
> access Stand_Type[314,2,17] when it gets to:
> 
> sum { i in stands, j in pres[char_stand[i], t in 0..19 } Stand_Type[i,j,t].
> 
> I don't know what to make of it.
> 

I tried to reproduce the effect (see below). As you can see,
Stand_Type[314,2,17] is *not* referenced; otherwise, this would cause a
zero divide error. Please check your model and data more carefully;
maybe that parameter member is referenced somewhere else.


Andrew Makhorin


set stands;
set pres{0..1};
param char_stand{stands};

display stands, pres, char_stand;

param Stand_Type{i in stands, j in 1..1000, t in 0..19} :=
   if i = 314 and j = 2 and t = 17 then 1 / 0 else 1;

display sum{ i in stands, j in pres[char_stand[i]], t in 0..19 }
      Stand_Type[i,j,t];

data;

set stands := 300, 314, 350;
set pres[0] := 1, 101, 102;
set pres[1] := 1, 2, 3, 4, 5, 6;
param char_stand := [300] 1, [314] 0, [350] 1;

end;

GLPSOL: GLPK LP/MIP Solver, v4.48
Parameter(s) specified in the command line:
 --check -m test.mod --log test.log
Reading model section from test.mod...
Reading data section from test.mod...
20 lines were read
Display statement at line 5
stands:
   300
   314
   350
pres[0]:
   1
   101
   102
pres[1]:
   1
   2
   3
   4
   5
   6
char_stand[300] = 1
char_stand[314] = 0
char_stand[350] = 1
Display statement at line 10
300
Model has been successfully generated