Question - Load matrices from OP2

[Gustav Graves]

Hello. I'm quite new to pyNastran and would appreciate little help. I've got OP2 file with results from modal analysis in which are stored modal mass matrices(EFMASS,EFMFACS etc.) My question is, how can I load these matrices into numpy array/matrix? I've got into the point where I've created the .matrix/Matrix "variable" but I am unable to load actual values. Here is copy from python console:

matrices:

  Matrix['EFMASSS'];  shape=(6, 6);     type=scipy.sparse.coo.coo_matrix;      dtype=float64;   desc=square

  Matrix['EFMFACS'];  shape=(1, 2);     type=scipy.sparse.coo.coo_matrix;      dtype=float64;   desc=rectangular

  Matrix['EFMFSMS'];  shape=(1, 1);     type=scipy.sparse.coo.coo_matrix;      dtype=float64;   desc=symmetric

  Matrix['MEFMASS'];  shape=(6, 2);     type=scipy.sparse.coo.coo_matrix;      dtype=float64;   desc=rectangular

  Matrix['MEFWTS'];   shape=(6, 2);     type=scipy.sparse.coo.coo_matrix;      dtype=float64;   desc=rectangular

  Matrix['MPFACS'];   shape=(6, 2);     type=scipy.sparse.coo.coo_matrix;      dtype=float64;   desc=rectangular

  Matrix['RBMASSS'];  shape=(6, 6);     type=scipy.sparse.coo.coo_matrix;      dtype=float64;   desc=square

model.matrices['EFMASSS']

Out[101]: Matrix['EFMASSS'];  shape=(6, 6);     type=scipy.sparse.coo.coo_matrix;      dtype=float64;   desc=square

[Steven Doyle]

Ohh...those really should use numpy arrays vs. sparse matrices.  Close enough ;)

I think you’re getting confused due to the print.  It’s just meant to be a quick overview.  You just need:

    data = model.matrices[‘EFMASSS’].data

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