code: def rfft(a, n=None, axis=-1, norm=None):
      if norm is None:
          norm = "backward"
      a = ivy.array(a, dtype=ivy.float64)
      return ivy.dft(
          a,
          axis=axis,
          inverse=False,
          onesided=True,
          dft_length=n,
          norm=norm,
      )
  
file_path: ivy/ivy/functional/frontends/numpy/fft/discrete_fourier_transform.py
imports: import ivy
  from ivy.functional.frontends.numpy.func_wrapper import to_ivy_arrays_and_back
  from ivy.func_wrapper import with_unsupported_dtypes
label_desc: Use image node_id 10 for calling a global function with example usage: rfft(a, n, axis, norm) and returns: ivy