text: import sympy as sp
  from seaman_symbols import *
  from surge_hull_equations import *
  
  X_h_function = sp.lambdify((v_w,r_w,X_vv,X_vr,X_rr,X_res,volume,rho,L,g),
                             sp.solve(surge_hull_equation_SI,X_h)[0],
                             modules='numpy',
                             )