(Mass test truss in 1D.
 The force is 1 on the right node.
 The lumped mass is 1 on the right node.
 The velocity of the right node should become 1 after a timestep of 0.1,
 so that the acceleration of 0.1/0.1=1 makes equilibrium with the force.)

echo -no
number_of_space_dimensions 1
materi_velocity
materi_velocity_integrated
end_initia

node 1  0
node 2  1
element 1  -truss 1 2

group_type 0  -truss
group_truss_area 0  1.0
group_truss_density 0  2.0

bounda_unknown 0  1 -velx
bounda_time    0  0. 0. 100. 0.
bounda_force   1  2 -velx
bounda_time    1  0. 1. 100. 1.

control_timestep 0  1.e-1 1.e-1
(
control_print    0  -time_current -node_dof
)

target_item    0  -node_dof 2 -velx
target_value   0  1.e-1 1.e-8
end_data
