Initializing help system before first use

getprimalray

Purpose
Get a primal ray for an unbounded problem.
Synopsis
function getprimalray(ray:array(set of mpvar) of real):boolean
Argument
ray 
An array of reals over all constraints in the problem (as loaded) in which the primal ray is returned.
Return value
This procedure returns the primal ray found for the problem if the problem is found to be primal unbounded (thus dual infeasible) and one is available.
Example 
declarations
 all_variables : set of mpvar
 primal_ray : array(all_variables) of real
end-declarations
if getprobstat <> XPRS_UNB then
  writeln("Problem is not unbounded.")
else
  HasRay := getprimalray(primal_ray)
  if HasRay then
   writeln("Primal ray:")
   forall (c in all_variables)
     writeln(getname(c), " ", primal_ray(c))
  else
   writeln("No primal ray was found")
  end-if
end-if
Further information
1. The return value of the function is true if a primal ray is available, and false otherwise.
2. The dimension and base set of the ray argument will be set up by the function.
Related topics
getdualray
Module
mmxprs

Parent Topic Procedures and functions

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