Number_of_elements =  4
Number_of_nodes =  5
Element_incidences =

   1   2
   2   3
   3   4
   4   5

Local_stiffness_matrix =

   100
   100
   100
   100

Load_matrix =

    0
    0
  -20
  -30
   30

Global_stiffness_matrix =

   100  -100     0     0     0
  -100   200  -100     0     0
     0  -100   200  -100     0
     0     0  -100   200  -100
     0     0     0  -100   100

Load_matrix =

    0
    0
  -20
  -30
   30