DEGDIAG.SIF

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* SET UP THE INITIAL DATA *
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NAME          DEGDIAG

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

*   A degenerate bound constrained convex quadratic program
*   with a tri-diagonal Hessian

*   SIF input: Nick Gould, August 2011

*   classification QBR2-AN-V-0

*   The number of variables - 1

*IE N                   10
*IE N                   50
*IE N                   100
*IE N                   1000
 IE N                   10000
 IE N                   100000

*  Other useful values.

 IE 0                   0

VARIABLES

 DO I         0                        N
 X  X(I)
 ND

GROUPS

BOUNDS

 RI RN        I
 RA RN        RN        1.0
 DO I         0                        N
 RI RI        I
 R/ LOWER     RI                       RN
 ZL DEGDIAG   X(I)                     LOWER
 ND

START POINT

 XV DEGDIAG   'DEFAULT' 2.0

QUADRATIC

 DO I         0                        N
 X  X(I)      X(I)      1.0
 ND

OBJECT BOUND

*   Solution

ENDATA