Export diffrential or stress stiffness matrix in buckling

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Export diffrential or stress stiffness matrix in buckling

hesamkhann
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Hi
I need export diffrential(stress or geometric) stiffness matrix in linear buckling for use in matlab program, i find method export  of usual stiffness matrix, but i cant any data about export stress stiffness matrix in abaqus script,
Can some one help me about it?