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The following diagrams provide aggregated statistics on sources and characteristics of the instances in QPLIB. You can download the raw data in csv format. The data fields are defined in the documentation.
For a definition of the three letter problem classification see the documentation.
Continuous Instances /
- The density in left scatter plot is defined as (#nonzeros) / (#vars * (#cons + 1)).
- The density in right scatter plot is defined as (#nonlinear nonzeros) / (#nonlinear vars * (#quadratic cons + 1 if objective is nonlinear)).
- Densities below 0.05 are shown as 0.05.
The diagram below shows the instances with a quadratic objective function sorted according to the density of the quadratic objective function coefficient matrix.