OneCable OneCable
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OneCable OneCableさんの最近のアクティビティ-
OneCable OneCableさんが投稿を作成しました:
Ignored lazy constraints lead to wrong solution -- another case
Hello,I seem to have a problem similar to posts such as these:https://support.gurobi.com/hc/en-us/community/posts/360078071312-Ignored-lazy-constraint-leads-to-wrong-solutionSince that post is clos...
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OneCable OneCableさんがコメントを作成しました:
Hi Vassilios,I am encountering a situation where with default values the MIP starts on 4 threads on my machine. Then, the same candidate integer XBar solution is encountered within the Lazy cut cal...
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OneCable OneCableさんがコメントを作成しました:
Hi VassiliosI have a query. I have not read the paper the OP posted.Is the CPX_PARAM_SOLNPOOLINTESITY setting of 4, documentation here: https://www.ibm.com/docs/en/icos/22.1.0?topic=parameters-solu...
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OneCable OneCableさんが投稿を作成しました:
Query on GRBcblazy() -- what happens if added lazy cut is wrong and does not cutoff current candidate MIP solution
進行中Hello,From https://docs.gurobi.com/projects/optimizer/en/current/reference/c/callback.html#c.GRBcblazyYou would typically add a lazy constraint by querying the current node solution (by calling GRB...
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OneCable OneCableさんがコメントを作成しました:
Hello Simranjit,Thank you. That is indeed my workflow.I had one additional query. Does that fact that when I stop my own computations after, as you state:“Repeat until no more violated cuts are fou...
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OneCable OneCableさんが投稿を作成しました:
Query on settings for branch-and-cut where LP is converted to MIP
回答済みHello,In the example provided with the library, tsp_c.c, GRBaddvar(model, 0, NULL, NULL, distance(x, y, i, j)/2, 0.0, 1.0, GRB_BINARY, name); ... /* ...
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OneCable OneCableさんが投稿を作成しました:
Setting lower and upper bounds on multiple variables in a single API call
回答済みFrom https://docs.gurobi.com/projects/optimizer/en/current/concepts/attributes/examples.html I am able to gather the following as the way to set bounds on ALL variables in a model.double lb[NUMVARS...
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OneCable OneCableさんがコメントを作成しました:
The min ratio test may give a movement length of 0. So, the non basic variable with negative reduced cost will enter the basis at value 0. So, it is a degenerate pivot.
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OneCable OneCableさんがコメントを作成しました:
Thank you. I will test these out. Regarding: "Advanced Start CPLEX: CPXPARAM_Advance (controls basis use in MIP/LP).Gurobi: No direct equivalent; use "Start" attribute for MIP warm starts." Since I...
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OneCable OneCableさんが投稿を作成しました:
Equivalences to certain CPLEX API calls/parameters
Hello, I want to find out whether there are any advantages to switching from CPLEX to Gurobi routines for my model. I plan to use the C API in GRB as well, just like I do in CPLEX. Although I h...