GOFFIN.SIF

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* SET UP THE INITIAL DATA *
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NAME          GOFFIN

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

*   A linear minmax problem in 50 variables.

*   Source: 
*   M.M. Makela,
*   "Nonsmooth optimization",
*   Ph.D. thesis, Jyvaskyla University, 1990

*   SIF input: Ph. Toint, Nov 1993
*              comments updated Feb 2001.

*   classification  LLR2-AN-51-50

 IE 1                   1
 IE 50                  50

VARIABLES

 DO I         1                        50
 X  X(I)
 OD I
    U

GROUPS

 XN OBJ       U         1.0

 DO I         1                        50
 XL F(I)      U         -1.0           X(I)      50.0
 DO J         1                        50
 XL F(I)      X(J)      -1.0
 OD J
 OD I

BOUNDS

*   All variables are free

 FR GOFFIN    'DEFAULT'

START POINT

 DO I         1                        50
 RI RI        I
 RA T         RI        -25.5
 Z  GOFFIN    X(I)                     T
 OD I

OBJECT BOUND

*   Solution

*LO SOLTN               0.0

ENDATA