*HEADING
: EIGENVALUE ANALYSIS OF AN UNCONSTRAINED 1-ELEMENT MESH  [CPE4E]
*PREPRINT,ECHO=YES,HISTORY=NO,MODEL=NO
*NODE,NSET=NALL
 1,0.,0.
 3,7.,0.
 7,0.,7.
 9,7.,7.
*ELEMENT,TYPE=CPE4E, ELSET=EALL
 1,1,3,9,7
*SOLID SECTION,MATERIAL=A1, ELSET=EALL
*MATERIAL,NAME=A1
*ELASTIC
 3.E6,.3
*PIEZOELECTRIC,TYPE=S
15.08,-5.207,-5.207,0.,0.,0.,0.,0.
0.,12.710,0.,0.,0.,0.,0.,0.,
0.,0.
*DIELECTRIC,TYPE=ISO
5.872E-9, 
*DENSITY
7.5E-4, 
*STEP,PERTURBATION
FIRST STEP RESTRAINS ALL EPOT, COMPARE WITH CPE411 RESULTS
*FREQUENCY, eigensolver=lanczos, SIM=NO
5, , ,-1.E7 
*BOUNDARY
1,9
3,9
7,9
9,9
*MODAL FILE
*END STEP
*STEP,PERTURBATION
SECOND STEP RELEASES ALL BUT ONE EPOT
*FREQUENCY, eigensolver=lanczos, SIM=NO
5, , ,-1.E7 
*BOUNDARY
1,9
*MODAL FILE
*EL FILE
S,E,EFLX
*EL FILE,MODE=5
EPG, 
*NODE FILE
U,
*NSET,NSET=NOUT
3,9
*NODE FILE,NSET=NOUT,MODE=5
EPOT,
*END STEP