[Cbc] Always, always Cutlength

[Yves Touchard]

John,

I am sorry to disturb you (once more) about the cutlength value.

>From my understanding, increasing this value decreases efficiency and increases accuracy.
And decreasing this value, increases efficiency and decreases accuracy.

So, if i am not wrong, please, could you explain me the following behaviour:
[ bin/cbc t_18.lp threads 104 cutlength XX divesolves 301 ratio 0.05 multiple 4 branch printingOptions rows solution t_18..sol ]
[ t18_lp file is there: https://www.dropbox.com/s/748azg1miloa3iw/t_18.lp?dl=0 ]

  *   With a XX cutlength value of 5, 10, 15, 20, 25, 29, 31, 35 and 50 the optimal solution is found.
  *   With a XX cutlength value of 30 and 45, the problem is infeasible (but become feasible with a multiple value of 1).

Regards,

Yves

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