make_afr

compas_cra.equilibrium.make_afr(total_vcount, fcon_number=8, mu=0.8, penalty=False, friction_net=False)

Create friction matrix Afr and Afr@B.

Parameters:

total_vcountint

The total number of vertices

fcon_numberint, optional

N-sided of linearised friction cone.

mufloat, optional

Friction coefficient.

penaltybool, optional

Return penalty matrix if True.

friction_netbool, optional

Friction net formulation if True for the penalty formulation, friction plus formulation if True.

Returns:

csr_matrix

the basis matrix # Nx3