Description

Small Model of Type : QCP

Category : GAMS Test library

Main file : qcp03.gms

$title Test case for cancellation in quadratic terms (QCP03,SEQ=86)

$if not set MTYPE   $set MTYPE qcp
$if not set TESTTOL $set TESTTOL 1e-6
scalar mchecks / 0 /;
$if not %QPMCHECKS% == 0 mchecks = 1;

variables z, x;
x.lo = 1;  x.up = 2;
equation f;

f..      sqr(x+1) - sqr(x) =e= z;

model m / f /;
solve m using %MTYPE% min z;

scalars
    tol     /    %TESTTOL% /;

abort$( m.solvestat <> %solveStat.normalCompletion% or (m.modelstat > %modelStat.locallyOptimal% and m.modelstat <> %modelStat.feasibleSolution%)) 'wrong status codes';

abort$( abs(z.l-3) > tol )                  'bad z.l';
abort$( abs(f.l) > tol)                     'bad f.l';
abort$( abs(x.l-1) > tol)                   'bad x.l';

if {mchecks,
  abort$( abs(z.m) > tol )                  'bad z.m';
  abort$( abs(f.m+1) > tol)                 'bad f.m';
  abort$( abs(x.m-2) > tol)                 'bad x.m';
};