Macro Variable _ORLP

The LP Procedure

Macro Variable _ORLP_

The LP procedure defines a macro variable named _ORLP_. This variable contains a character string that indicates the status of the procedure. It is set whenever the user gets control, at break points, and at procedure termination. The form of the _ORLP_ character string is STATUS= PHASE= OBJECTIVE= P_FEAS= D_FEAS= INT_ITER= INT_FEAS= ACTIVE= INT_BEST= PHASE1_ITER= PHASE2_ITER= PHASE3_ITER=. The terms are interpreted as follows:

STATUS=: the status of the current solution
PHASE=: the phase the procedure is in (1, 2, or 3)
OBJECTIVE=: the current objective value
P_FEAS=: whether the current solution is primal feasible
D_FEAS=: whether the current solution is dual feasible
INT_ITER=: the number of integer iterations performed
INT_FEAS=: the number of integer feasible solutions found
ACTIVE=: the number of active nodes in the current branch and bound tree
INT_BEST=: the best integer objective value found
PHASE1_ITER=: the number of iterations performed in phase 1
PHASE2_ITER=: the number of iterations performed in phase 2
PHASE3_ITER=: the number of iterations performed in phase 3

Table 3.5 shows the possible values for the nonnumeric terms in the string.

Table 3.5: Possible Values for Nonnumeric Terms

STATUS	P_FEASIBLE	D_FEASIBLE
SUCCESSFUL	YES	YES
UNBOUNDED	NO	NO
INFEASIBLE
MAX_TIME
MAX_ITER
PIVOT
BREAK
INT_FEASIBLE
INT_INFEASIBLE
INT_MAX_ITER
PAUSE
FEASIBLEPAUSE
IPAUSE
PROXIMITYPAUSE
ACTIVE
RELAXED
FATHOMED
IPIVOT
UNSTABLE
SINGULAR
MEMORY_ERROR
IO_ERROR
SYNTAX_ERROR
SEMANTIC_ERROR
BADDATA_ERROR
UNKNOWN_ERROR

This information can be used when PROC LP is one step in a larger program that needs to identify how the LP procedure terminated. Because _ORLP_ is a standard SAS macro variable, it can be used in the ways that all macro variables can be used (see the SAS Guide to Macro Processing).

Chapter Contents
Previous
Next
Top