qpsd_dw.tilde_zigzag_cpp_expedited function

Evaluation of normalized time-varying spectral density function (for MCMC algorithm)

qpsd_dw.tilde_zigzag_cpp_expedited(
  tilde.v,
  tilde.w1,
  tilde.w2,
  k1,
  k2,
  beta_basis_1_k,
  beta_basis_2_k
)