Description

Test that we handle QCP models with the power(*,2) function.
This is really a formulation test, not a solver test.

Contributor: Steven Dirkse, February 2011

Small Model of Type : QCP

Category : GAMS Test library

Main file : qcp08.gms

$title Test correctness for QCP with power(*,2) function (QCP08,SEQ=512)

$ontext
Test that we handle QCP models with the power(*,2) function.
This is really a formulation test, not a solver test.

Contributor: Steven Dirkse, February 2011

$offtext

variables x, y, z;
equations f, fp, g;

f..  z =E= sqr(x)     - x   + sqr(y)     + y ;
fp.. z =E= power(x,2) - x   + power(y,2) + y ;
g..  x + y =G= 4;

model m  / f,  g /;
model mp / fp, g /;
* these bounds should never be active but they help the global solvers
x.lo = 0;
x.up = 5;
y.lo = 0;
y.up = 5;

$if not set TESTTOL $set TESTTOL 1e-5
scalars
  mchecks / 0 /
  tol / %TESTTOL% /
  z_l / 7.5 /
  x_l / 2.5 /
  y_l / 1.5 /
  f_l / 0 /
  f_m / 1 /
  g_l / 4 /
  g_m / 4 /
  ;
$if not %QPMCHECKS% == 0 mchecks = 1;

* first solve the model that uses sqr
solve m using qcp min z;

abort$[abs(z.l-z_l) > tol]  'bad z.l';
abort$[abs(x.l-x_l) > tol]  'bad x.l';
abort$[abs(y.l-y_l) > tol]  'bad y.l';
abort$[abs(f.l-f_l) > tol]  'bad f.l';
abort$[abs(g.l-g_l) > tol]  'bad g.l';

if {mchecks,
  abort$[abs(z.m)     > tol]  'bad z.m';
  abort$[abs(x.m)     > tol]  'bad x.m';
  abort$[abs(y.m)     > tol]  'bad y.m';
  abort$[abs(f.m-f_m) > tol]  'bad f.m';
  abort$[abs(g.m-g_m) > tol]  'bad g.m';
};

* now solve the model that uses the poly function
solve mp using qcp min z;

abort$[abs(z.l-z_l) > tol]  'bad z.l';
abort$[abs(x.l-x_l) > tol]  'bad x.l';
abort$[abs(y.l-y_l) > tol]  'bad y.l';
abort$[abs(f.l-f_l) > tol]  'bad f.l';
abort$[abs(g.l-g_l) > tol]  'bad g.l';

if {mchecks,
  abort$[abs(z.m)     > tol]  'bad z.m';
  abort$[abs(x.m)     > tol]  'bad x.m';
  abort$[abs(y.m)     > tol]  'bad y.m';
  abort$[abs(f.m-f_m) > tol]  'bad f.m';
  abort$[abs(g.m-g_m) > tol]  'bad g.m';
};