[SCIP] Problem with integer variables getting not integer solution

[Luciana Garcia Richter]

Hi,

I have defined a problem with integer variables (it is an instance of
a knapsack problem).
I have included the print for the original problem, the transformed
problem and the solution.
As you can see, all variables are defined as integer, but the solution
I get is far away from an integer value (e.g. 2.6 for x1 or 0.4 for
x3)
Is there something I'm missing?


#########################  SCIPprintOrigProblem  ############################
STATISTICS
  Problem name     : Knapsack
  Variables        : 6 (0 binary, 6 integer, 0 implicit integer, 0 continuous)
  Constraints      : 1 initial, 1 maximal
OBJECTIVE
  Sense            : maximize
VARIABLES
  [integer] <x0>: obj=575.555555555556, original bounds=[0,10000000000]
  [integer] <x1>: obj=1280.55555555556, original bounds=[0,10000000000]
  [integer] <x2>: obj=1295, original bounds=[0,10000000000]
  [integer] <x3>: obj=1295, original bounds=[0,10000000000]
  [integer] <x4>: obj=1295, original bounds=[0,10000000000]
  [integer] <x5>: obj=1295, original bounds=[0,10000000000]
CONSTRAINTS
  [linear] <R>: -10000000000 <=  +520<x0>[I] +1000<x1>[I] +1066<x2>[I]
+1120<x3>[I] +1150<x4>[I] +1250<x5>[I] <= 5180;
END
#########################  SCIPprintTransProblem  ############################
STATISTICS
  Problem name     : t_Knapsack
  Variables        : 6 (0 binary, 6 integer, 0 implicit integer, 0 continuous)
  Constraints      : 1 initial, 1 maximal
OBJECTIVE
  Sense            : minimize
  Scale            : 0.555555555555556
VARIABLES
  [integer] <t_x0>: obj=-1036, global bounds=[1,2], local bounds=[1,2]
  [integer] <t_x1>: obj=-2305, global bounds=[3,3], local bounds=[3,3]
  [integer] <t_x2>: obj=-2331, global bounds=[2,2], local bounds=[2,2]
  [integer] <t_x3>: obj=-2331, global bounds=[-0,0], local bounds=[-0,0]
  [integer] <t_x4>: obj=-2331, global bounds=[-0,0], local bounds=[-0,0]
  [integer] <t_x5>: obj=-2331, global bounds=[-0,0], local bounds=[-0,0]
CONSTRAINTS
  [linear] <R>:  +625<t_x5>[I] +500<t_x1>[I] +533<t_x2>[I]
+560<t_x3>[I] +575<t_x4>[I] +260<t_x0>[I] <= 2590;
END
#########################  SCIPprintSol  ############################
objective value:                            -infinity
x0                               -1.00125783520231e-015
(obj:575.555555555556)
x1                                                2.6   (obj:1280.55555555556)
x2                                                  2   (obj:1295)
x3                                  0.400000000000001   (obj:1295)
x4                                                 -0   (obj:1295)
x5                                                  0   (obj:1295)

Thanks in advance,
Luciana