XSLPgetcolinfo, XPRSslpgetcolinfo
Purpose
Get current column information.
Topic areas
Synopsis
int XSLP_CC XSLPgetcolinfo(XSLPprob prob, int type, int col, XPRSalltype *p_info);
Arguments
|
prob
|
The current SLP problem
|
|
type
|
Type of information (see below)
|
|
col
|
Index of the column whose information is to be handled
|
|
p_info
|
Pointer to a variable to receive the information
|
Example
The following example prints the current value of variable 3:
XPRSalltype alltype;
XSLPgetcolinfo(prob, XSLP_COLINFO_VALUE, 3, &alltype);
printf("value[3]=%f\n", alltype.value.real);
Further information
1. If the data is not available, the type of the returned p_info is set to
XPRStype_undefined.
2. Please refer to the header file
xprs.h for the definition of XPRSalltype.
3. The following constants are provided for column information handling:
- XSLP_COLINFO_VALUE
- Get the current value of the column
- XSLP_COLINFO_RDJ
- Get the current reduced cost of the column
- XSLP_COLINFO_DELTAINDEX
- Get the delta variable index associated to the column
- XSLP_COLINFO_DELTA
- Get the delta value (change since previous value) of the column
- XSLP_COLINFO_DELTADJ
- Get the delta variables reduced cost
- XSLP_COLINFO_UPDATEROW
- Get the index of the update (or step bound) row associated to the column
- XSLP_COLINFO_SB
- Get the step bound on the variable
- XSLP_COLINFO_SBDUAL
- Get the dual multiplier of the step bound row for the variable
- XSLP_COLINFO_DETROW
- The determining row for the variable (or -1 if it is not determined)
- XSLP_COLINFO_CONVERGENCESTATUS
- The convergence status of the variable (0 if unconverged, 1-based index of the convergencetolerance that applied otherwise)
4. This function can be used to get the current SLP iteration solution in the case where this is not available using
XSLPgetslpsol due to solution filtering via
XSLP_FILTER.
5. The convergence status will be an item from the following list:
| convergencestatus | Tolerance |
|---|---|
| 0 | unconverged |
| 1 | Closure tolerance (TC) |
| 2 | Absolute delta tolerance (TA) |
| 3 | Relative delta tolerance (RA) |
| 4 | Absolute coefficient tolerance (TM) |
| 5 | Relative coefficient tolerance (RM) |
| 6 | Absolute impact tolerance (TI) |
| 7 | Relative impact tolerance (RI) |
| 8 | Absolute slack tolerance (TS) |
| 9 | Relative slack tolerance (RS) |
| other | user convergence |
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