Re: [Help-glpk] problem with dual

[name name]

I printt model ans solution how shoud I understund that?


glp_print_sol give a this file


Problem:    
Rows:       5
Columns:    5
Non-zeros:  5
Status:     UNDEFINED
Objective:  objective = 0 (MINimum)

   No.   Row name   St   Activity     Lower bound   Upper bound    Marginal
------ ------------ -- ------------- ------------- ------------- -------------
     1 constraint1  B              0            48               

     2 constraint2  B              0            35               
     3 constraint3  B              0            24               
     4 constraint4  B              0            10               
     5 constraint5  B              0             8               

   No. Column name  St   Activity     Lower bound   Upper bound    Marginal
------ ------------ -- ------------- ------------- ------------- -------------
     1              NL             0             0                       < eps

     2              NL             0             0                       < eps
     3              NL             0             0                       < eps
     4              NL             0             0                       < eps

     5              NL             0             0                       < eps

Karush-Kuhn-Tucker optimality conditions:

KKT.PE: max.abs.err = 0.00e+00 on row 0
        max.rel.err = 0.00e+00 on row 0
        High quality

KKT.PB: max.abs.err = 4.80e+01 on row 1
        max.rel.err = 9.80e-01 on row 1
        PRIMAL SOLUTION IS INFEASIBLE

KKT.DE: max.abs.err = 1.00e+00 on column 1

        max.rel.err = 5.00e-01 on column 1
        DUAL SOLUTION IS WRONG

KKT.DB: max.abs.err = 0.00e+00 on row 0
        max.rel.err = 0.00e+00 on row 0
        High quality

End of output



glp_write_lp give this:

\* Problem: Unknown *\

Minimize
 objective: + x_1 + x_2 + x_3 + x_4 + x_5

Subject To
 constraint1: + 5 x_1 >= 48
 constraint2: + 2 x_2 >= 35
 constraint3: + 2 x_3 >= 24

 constraint4: + 2 x_4 >= 10
 constraint5: + x_5 >= 8

End