*HEADING
 SUBSTRUCTURE GENERATION FILE
*NODE,NSET="ALL NODES"
  1, 0.0, 0.0
 11, 1.0, 0.0
*NGEN,NSET="ALL NODES"
 1,11,1
** ----------------------- Element
*ELEMENT,TYPE=B21,ELSET="BEAM ELEMENTS"
 1,1,2
*ELGEN,ELSET="BEAM ELEMENTS"
 1,10,1,1
*BEAMSECTION,ELSET="BEAM ELEMENTS",SECT=RECT,MAT=STEEL
 0.1,0.1
*MATERIAL,NAME=STEEL
*ELASTIC
 2.1E11,0.3
*DENSITY
 7800., 
**
*NSET,NSET=RETNODES
3, 6, 11
**
**
*STEP
*FREQUENCY,EIGENSOLVER=LANCZOS
 6,,
*BOUNDARY
  1,1,2	
  1,6,6
  RETNODES, 1, 2
*NODE PRINT,NSET="ALL NODES"
U, 
*NODE FILE,NSET="ALL NODES"
U, 
*END STEP
**
**
**
*step
*SUBSTRUCTURE GENERATE,TYPE=Z1,RECOVERYMATRIX=YES,MASSMATRIX=YES,OVERWRITE
*RETAINED NODAL DOFS
 RETNODES,1,2
*SELECT EIGENMODES,GENERATE
1,6
*BOUNDARY
  1,1,2	
  1,6,6
** 
*SUBSTRUCTURE MATRIX OUTPUT,STIFFNESS=YES,MASS=YES,SLOAD=YES,
RECOVERYMATRIX=YES,FILENAME=MATRIXNEW
*END STEP