parameters: (c)
return_statement: return zs + zs[::-1]
docstring: Covert Chebyshev series to z-series.
  
      Covert a Chebyshev series to the equivalent z-series. The result is
      never an empty array. The dtype of the return is the same as that of
      the input. No checks are run on the arguments as this routine is for
      internal use.
  
      Parameters
      ----------
      c : 1-D ndarray
          Chebyshev coefficients, ordered from low to high
  
      Returns
      -------
      zs : 1-D ndarray
          Odd length symmetric z-series, ordered from  low to high.
docstring_summary: Covert Chebyshev series to z-series.
docstring_tokens: Covert Chebyshev series to z - series .
function: def _cseries_to_zseries(c):
      """Covert Chebyshev series to z-series.
  
      Covert a Chebyshev series to the equivalent z-series. The result is
      never an empty array. The dtype of the return is the same as that of
      the input. No checks are run on the arguments as this routine is for
      internal use.
  
      Parameters
      ----------
      c : 1-D ndarray
          Chebyshev coefficients, ordered from low to high
  
      Returns
      -------
      zs : 1-D ndarray
          Odd length symmetric z-series, ordered from  low to high.
  
      """
      n = c.size
      zs = np.zeros(2*n-1, dtype=c.dtype)
      zs[n-1:] = c/2
      return zs + zs[::-1]
function_tokens: def _cseries_to_zseries ( c ) : n = c . size zs = np . zeros ( 2 * n - 1 , dtype = c . dtype ) zs [ n - 1 : ] = c / 2 return zs + zs [ : : - 1 ]