code: def marche(
      a: float, b: float, p: float, n: int, x: float
  ) -> np.ndarray:
      l = np.zeros(n, dtype=np.complex_)  # noqa
      m = np.zeros(n, dtype=np.complex_)
      tmp = (
          1
          / (2 * np.pi * np.arange(1, n))
          * (np.exp(-2 * 1j * np.pi * p * np.arange(1, n)) - 1)
          * np.exp(-2 * 1j * np.pi * np.arange(1, n) * x)
      )
      l[1:n] = 1j * (a - b) * tmp
      l[0] = p * a + (1 - p) * b
      m[0] = l[0]
      m[1:n] = 1j * (b - a) * np.conj(tmp)
      T = toeplitz(l, m)
      return T
  
file_path: nevergrad/nevergrad/functions/photonics/photonics.py
imports: import typing
  from pathlib import Path
  import numpy
  from scipy.linalg import toeplitz
label_desc: Use image node_id 5 for calling a global function with example usage: marche(a, b, p, n, x) and returns: T