# log file for model "gtc-w08-lectures.dat" from co370 classes of January 2008
# sensitivity analysis
# the log file has been edited and some comments have been added

ampl: option cplex_options 'sensitivity';
ampl: option presolve 0;
ampl: model resconstr.mod;
ampl: data gtc-w08-lectures.dat;
ampl: expand;
maximize totprofit:
	200*x['PLIERS'] + 300*x['HAMMERS'];

subject to budget['assembly']:
	x['PLIERS'] + 2*x['HAMMERS'] <= 20;

subject to budget['steel']:
	5*x['PLIERS'] + 5*x['HAMMERS'] <= 60;

ampl: solve;
ILOG CPLEX 10.100, licensed to "university-waterloo, canada", options: e m b q use=20 
CPLEX 10.1.0: sensitivity
CPLEX 10.1.0: optimal solution; objective 3200
2 dual simplex iterations (1 in phase I)

suffix up OUT;
suffix down OUT;
suffix current OUT;
ampl: display x;
x [*] :=
HAMMERS  8
 PLIERS  4
;

ampl: display x.rc, x.down,  x.current,  x.up;
:       x.rc x.down x.current  x.up    :=
HAMMERS   0    200      300     400
PLIERS    0    150      200     300
;


# ---------- comments added into log file ----------
# x.rc gives the reduced costs of variables x
# x.down and x.up give respectively the lower and upper endpoints of the 
# range of the objective-function coefficients of the variables x for which
# the current basis remains optimal
# x.current gives the current values of the objective-function coefficients
# which one could also have obtained by typing "display profit;"
# ---------- end of comments added into log file ----------



ampl: display budget,  budget.down,  budget.current,  budget.up,  budget.slack;
:        budget budget.down budget.current budget.up budget.slack    :=
assembly   100       12            20           24         0
steel       20       50            60          100         0
;


# ---------- comments added into log file ----------
# budget gives the shadow price of the budget constraints
# budget.down and budget.up give respectively the lower and upper endpoints
# of the RHS of the budget constraints for whih the current basis remains 
# feasible, and hence optimal
# budget.current gives the current values of the RHS of the budget constraints
# which one could also have obtained by typing "display avail;"
# budget.slack gives the slack (=RHS-LHS) in the budget constraints 
# ---------- end of comments added into log file ----------

ampl: quit;