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Thanks fb1966, I am using OSN and figured out the problem late this night :) Finally I should assign 3 DOFs to zerolength via the menu "assign---->`node...". I do not know if it is correcte, I will see. Thanks again for your reply, for sure I will read the entire informations in the link y...

hi fmk,
if node 1 is 6 dofs and 111 3 dofs, then
the
equalDOF 111 1 1 2 3
2 translations (x and y) and 1 rotation (z)
rigth ?

thanks

Hello, I am trying to have absolute and relative accelaerations. The following are the recorders : recorder Node -file $dataDir/ARelFree.out -time -node 1 7 14 27 34 47 54 -dof 1 accel; recorder Node -file $dataDir/AAbsFree.out -timeSeries 20000 -time -node 1 7 14 27 34 47 54 -dof 1 accel; My proble...