Viewing the solution

Always check the solution status of the problem before accessing any solution values.

if (getprobstat=XPRS_OPT) then
  writeln('optimal!')
else
  writeln('not optimal!')
  exit(1)
end-if

Alternatively, testing all problem states:

case getprobstat of
  XPRS_OPT: writeln('optimal')
  XPRS_INF: writeln('infeasible')
  XPRS_UNB: writeln('unbounded')
  XPRS_UNF: writeln('unfinished')
else
  writeln('unexpected problem status!')
end-case

Accessing the solution values within the model:

writeln('Maximum revenue: $', getobjval)
writeln('x(1) = ', getsol(x(1)), '  x(2) = ', x(2).sol)

Solution values of constraints: activity value + slack value = RHS

 

MaxCap := 10*x + 20*y <= 30

Activity value:

getsol(10*x + 20*y)
getact(MaxCap)

Slack value:

getsol(30 - (10*x + 20*y))
getslack(MaxCap)

Xpress Workbench: assuming that the model runs successfully, the logging pane at the bottom of the workspace reports that the run is complete. If a model has been run through the debugger, you can browse solution values of decision variables and constraints in the Debugger tab on the right side of the workspace.