*HEADING
: EIGENVALUE ANALYSIS OF AN UNCONSTRAINED 1-ELEMENT MESH  [PIPE32]
*NODE,NSET=NALL
1,0.
2,1.,2.,3,
3,0.5,1.,1.5
*ELEMENT,TYPE=PIPE32, ELSET=EALL
1,1,3,2
*BEAM SECTION,SECTION=PIPE,MATERIAL=A1, ELSET=EALL
10.,1.
*MATERIAL,NAME=A1
*ELASTIC
30.E6, 
*DENSITY
7.5E-4, 
*STEP
*FREQUENCY, eigensolver=lanczos, SIM=NO
11, , ,-1.0E4 
*OUTPUT,HISTORY,FREQUENCY=1
*MODAL OUTPUT
*END STEP