Purpose
This function is deprecated, and will be removed in future releases. Perform
goal programming.
Synopsis
int XPRS_CC XPRSgoal(XPRSprob prob, const char *filename, const char *flags);
GOAL [filename] [-flags]
Arguments
|
prob
|
The current problem.
|
|
filename
|
A string of up to
MAXPROBNAMELENGTH characters containing the file name from which the directives are to be read (a
.gol extension will be added).
|
|
flags
|
Flags to pass to
XPRSgoal (
GOAL):
|
o
|
optimization process logs to be displayed;
|
|
l
|
treat integer variables as linear;
|
|
f
|
write output into a file
filename.grp.
|
|
Example 1 (Library)
In the following example, goal programming is carried out on a problem,
goalex, taking instructions from the file
gb1.gol:
XPRSreadprob(prob,"goalex","");
XPRSgoal(prob,"gb1","fo");
Example 2 (Console)
Suppose we have a problem where the weight for objective function
OBJ1 is unknown and we wish to perform goal programming, maximizing this row and relaxing the resulting constraint by 5% of the optimal value, then the following sequence will solve this problem:
READPROB
GOAL
P
O
OBJ1
MAX
P
5
<empty line>
Further information
1. The command
XPRSgoal (
GOAL) used with objective functions allows the user to find solutions of problems with more than one objective function.
XPRSgoal (
GOAL) used with constraints enables the user to find solutions to infeasible problems. The goals are the constraints relaxed at the beginning to make the problem feasible. Then one can see how many of these relaxed constraints can be met, knowing the penalty of making the problem feasible (in the Archimedean case) or knowing which relaxed constraints will never be met (in the pre-emptive case).
2. (
Console) If the optional
filename is specified when
GOAL is used, the responses to the prompts are read from
filename.gol. If there is an invalid answer to a prompt, goal programming will stop and control will be returned to the Optimizer.
3. It is not always possible to use the output of one of the goal problems as an input for further study because the coefficients for the objective function, the right hand side and the row type may all have changed.
4. In the Archimedean/objective function option, the fixed value of the resulting objective function will be the linear combination of the right hand sides of the objective functions involved.
Related topics
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