get_mck¶

opstool.pre.get_mck(matrix_type, constraints_args, system_args=('FullGeneral',), numberer_args=('Plain',))[source]¶

Get the mass, stiffness, or damping matrix from the OpenSees model. Added in v0.1.15.

Return type:: DataArray

Parameters:¶

matrix_typestr: Type of matrix to extract, must be one of ‘m’, ‘k’, ‘ki’, or ‘c’.
constraints_argsUnion[list, tuple]: Arguments for the constraints type, e.g., (“Penalty”, 1e10, 1e10).
system_argsUnion[list, tuple], optional: Arguments for the system type, default is (“FullGeneral”,).
numberer_argsUnion[list, tuple], optional: Arguments for numberer to use, default is (“Plain”,).

Returns:¶

matrixxarray.DataArray: The extracted matrix, either mass, stiffness, or damping. The coordinates of the DataArray will be the node tags and degrees of freedom–“{ntag}-{dof}”.

Examples:¶

>>> K = get_mck("k", ["Penalty", 1e10, 1e10], ["FullGeneral"], ["Plain"])
>>> print(K.to_numpy())
[[1.0 0.0 0.0]
 [0.0 1.0 0.0]
 [0.0 0.0 1.0]]