Silke Horn
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Gurobi Staff
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Activity overview
Latest activity by Silke Horn-
Silke Horn created an article,
What does "Model contains large matrix coefficient range" mean?
The coefficient statistics are some of the first pieces of information you will encounter in the Gurobi log. These provide an overview of the ranges of the absolute values of the numeric values in ...
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Silke Horn created an article,
How do I scale my model to improve its numerical properties?
Scaling can have a huge impact on the model's numerical properties, which can, in turn, affect both solution time and quality. Gurobi does some scaling automatically (which can be controlled via th...
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Silke Horn created an article,
Should I add distributed workers to my Instant Cloud pool?
In the pool settings, you can set the number of Compute Servers and the Number of distributed workers per server for your pool. Note that on Instant Cloud, when enabled, each compute server has its...
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Silke Horn commented,
Hi, You are right that GRBQuadExpr.addTerm only accepts variables, not complex expressions. There are two ways around this: You expand the quadratic expression yourself, i.e., \((K+x+y)^2 = K^2 + ...
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Silke Horn commented,
Yes, I assume the terms with the 0 coefficient at the beginning are there to preserve the variable order. But then Gurobi should repeat all with the non-zero coefficient, not just some. Is this the...
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Silke Horn commented,
First of all, if a coefficient in the LP file is 0 when it should be 1, then there is something wrong. How did you set the objective? Secondly, there are a lot of variables with coefficient 0 in th...
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Silke Horn commented,
Yes, you can do that (as long as the model is for non-production use of course). With the size-limited license you can solve models up to 2000 variables, 2000 linear constraints, and 200 variables ...
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Silke Horn commented,
Yes, the code looks correct. The LinExpr constructor should be the fastest way to build these expressions. However, you will only see a noticeable difference for very large expressions (hundreds of...
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Silke Horn commented,
I am not sure I understand your question. You could use getConstrByName to access the constraint by its name. However, we usually discourage using this function since it is not very efficient. Stor...
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Silke Horn commented,
If you have a constraint object, you need to use the getRow method on the model to get the left-hand-side expression. This will then be a LinExpr object. One question: Did you need the names to acc...