Hello everyone,

I'm trying to run a input file by import a matrix file defining mass and stiffness. Abaqus prompts the following error which makes no sense to me (I'm running an implicit dynamic simulation):

*ERROR: ONLY STATIC, FREQUENCY EXTRACTION, MODAL DYNAMIC, MODE-BASED

STEADY-STATE DYNAMICS, COMPLEX EIGENVALUE EXTRACTION, AND

SUBSPACE-BASED STEADY-STATE DYNAMICS THAT USES THE SIM ARCHITECTURE

ARE ALLOWED IN A MODEL WITH SPARSE MATRIX INPUT (*MATRIX INPUT AND

*MATRIX ASSEMBLE)

When output a generated matrix, aren't they indeed sparse matrices? What is the exact problem here?