code: def rfftfreq(n, d=1.0):
      """Return the FFT sample frequencies for real input.
  
      Args:
          n (int): Window length.
          d (scalar): Sample spacing.
  
      Returns:
          cupy.ndarray:
              Array of length ``n//2+1`` containing the sample frequencies.
  
      .. seealso:: :func:`numpy.fft.rfftfreq`
      """
      return cupy.arange(0, n // 2 + 1, dtype=np.float64) / (n * d)
  
imports: import functools
  import math
  import numpy
  import cupy
  from cupy.fft import config
  from cupy.fft._cache import get_plan_cache
label_desc: Use image node_id 32 for calling a global function with example usage: rfftfreq(n, d) and returns: unknown