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The Steiner tree problem is a well-known combinatorial optimization problem which asks a minimum spanning subtree containing a given subset of vertices (terminals). However, in many practical applications nodes and edges have an additional numerical value which represents their significance. That is where the Prize-Collecting Steiner Tree problem arises: the goal is to find a subgraph connecting all the terminals with the most expensive nodes and least expensive edges. Since this problem is proven to be NP-hard, exact and efficient algorithm does not exist. Loopy belief propagation can be utilised to obtain an approximate solution to this problem [1,2].
To get the latest version of the package and install it from CRAN run the following command:
install.packages("pcSteiner")These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
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