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I'm using CBC to solve p0201.mps with preprocessing and presolve off. I've been collecting copies of each LP solved during the main branch and bound loop, and I happened to notice that two separate branching trees form in the process. Nodes 0 - 29 belong to one tree rooted at node 0, while nodes 30 - 58 belong to another rooted at node 30.
I saw in set of variables fixed in both the .lp file for node 0 and the .lp file for node 30 that there was one variable (x10) with bounds that did not overlap between the two LPs. Among the set of branching trees formed during the main branch and bound loop, will this always be the case for any pair of distinct root node LPs?
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I'm using CBC to solve
p0201.mpswith preprocessing and presolve off. I've been collecting copies of each LP solved during the main branch and bound loop, and I happened to notice that two separate branching trees form in the process. Nodes 0 - 29 belong to one tree rooted at node 0, while nodes 30 - 58 belong to another rooted at node 30.I saw in set of variables fixed in both the .lp file for node 0 and the .lp file for node 30 that there was one variable (
x10) with bounds that did not overlap between the two LPs. Among the set of branching trees formed during the main branch and bound loop, will this always be the case for any pair of distinct root node LPs?Beta Was this translation helpful? Give feedback.
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