Re: [Help-glpk] implementing constraints in Scala

[name name]

My probleme is

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

Optimal basic solution to my lpi s obtained with glpsol is the
following:

Rows:       5
Columns:    5
Non-zeros:  5

Status:     OPTIMAL
Objective:  objective = 52.1 (MINimum)

  No.   Row name   St Activity  Lower bound Upper bound Marginal
------ ------------ -- --------- ----------- ----------- --------

    1 constraint1  NL        48          48                  0.2
    2 constraint2  NL        35          35                  0.5
    3 constraint3  NL        24          24                  0.5
    4 constraint4  NL        10          10                  0.5
    5 constraint5  NL         8           8                    1

  No. Column name  St Activity  Lower bound Upper bound Marginal
------ ------------ -- --------- ----------- ----------- --------

     1 x_1          B        9.6           0
     2 x_2          B       17.5           0
     3 x_3          B         12           0
     4 x_4          B          5           0
     5 x_5          B          8           0


From here I wont to get the dual for all rows I should have 
0.2
0.5
0.5
0.5
1

but I got 0 for all rows
I use  GLPK.glp_get_row_dual(lp,

rowId+1)

Can you tell me where the problem is?

Thank you