Hi.
I set up a Travelling Salesman Problem model using GLPK. When I
increase the number of cities, I run into this message:
Warning: numerical instability (primal simplex, phase II)
* 24: obj = 3.065645000e+06 infeas = 1.747e-20 (0)
Could someone please tell me what this refers to and what I can do about it.
For example, are there parameters I can tweak to get rid of this
message? I am aware of glp_iocp but don't understand where its specific
parameters can be used in the face of the issue above.
Also, after that message I get a *lot* of messages like this:
+555052: mip = not found yet >= 3.065645938e+06 (89009; 260251)
+555716: mip = not found yet >= 3.065645938e+06 (89070; 260620)
+556402: mip = not found yet >= 3.065645938e+06 (89158; 260968)
Would this be related to the first problem (about numerical
instability)? It seems to get stuck at this point.
Any pointers would be appreciated.
-Will
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