| 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 breakpoints, 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_FEAS= | D_FEAS= |
| 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).
Copyright © 2008 by SAS Institute Inc., Cary, NC, USA. All rights reserved.