CLIFF.SIF

***************************
* SET UP THE INITIAL DATA *
***************************

NAME          CLIFF

*   Problem :
*   *********

*   The "cliff problem" in 2 variables

*   Source:  problem 206 (p. 46) in
*   A.R. Buckley,
*   "Test functions for unconstrained minimization",
*   TR 1989CS-3, Mathematics, statistics and computing centre,
*   Dalhousie University, Halifax (CDN), 1989.

*   SIF input: Ph. Toint, Dec 1989.

*   classification OUR2-AN-2-0

VARIABLES

    X1
    X2

GROUPS

 N  G1        X1        0.01
 N  G2        X1        -1.0           X2        1.0
 N  G3        X1        1.0            X2        -1.0

CONSTANTS

    CLIFF     G1        0.03

BOUNDS

 FR CLIFF     'DEFAULT'

START POINT

    CLIFF     X1        0.0
    CLIFF     X2        -1.0

GROUP TYPE

 GV L2        GVAR
 GV 20EXP     GVAR

GROUP USES

 T  G1        L2
 T  G3        20EXP

OBJECT BOUND

 LO CLIFF               0.0

*   Solution

 LO SOLTN               0.199786613

ENDATA

*********************
* SET UP THE GROUPS *
* ROUTINE           *
*********************

GROUPS        CLIFF

TEMPORARIES

 R  EXPA
 M  EXP

INDIVIDUALS

 T  L2
 F                      GVAR * GVAR
 G                      GVAR + GVAR
 H                      2.0

 T  20EXP
 A  EXPA                EXP( 20.0 * GVAR )
 F                      EXPA
 G                      20.0 * EXPA
 H                      400.0 * EXPA

ENDATA