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The LP Procedure

Input Data Sets

In addition to the DATA= input data set, PROC LP recognizes the ACTIVEIN= and the PRIMALIN= data sets.

ACTIVEIN= Data Set

The ACTIVEIN= data set contains a representation of the current active tree. The format is identical to that of the ACTIVEOUT= data set.

PRIMALIN= Data Set

The format of the PRIMALIN= data set is identical to the PRIMALOUT= data set. PROC LP uses the PRIMALIN= data set to identify variables at their upper bounds in the current solution and variables that are basic in the current solution.

You can add observations to the end of the problem data set if they define cost (right-hand-side) sensitivity change vectors and have TYPE=PRICESEN (RHSSEN). This enables you to solve a problem, save the solution in a SAS data set, and perform sensitivity analysis later. You can also use the PRIMALIN= data set to restart problems that have not been completely solved or to which new variables have been added.

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