code: def lagroots(c):
      """
      Compute the roots of a Laguerre series.
  
      Return the roots (a.k.a. "zeros") of the polynomial
  
      .. math:: p(x) = \\sum_i c[i] * L_i(x).
  
      Parameters
      ----------
      c : 1-D array_like
          1-D array of coefficients.
  
      Returns
      -------
      out : ndarray
          Array of the roots of the series. If all the roots are real,
          then `out` is also real, otherwise it is complex.
  
      See Also
      --------
      polyroots, legroots, chebroots, hermroots, hermeroots
  
      Notes
      -----
      The root estimates are obtained as the eigenvalues of the companion
      matrix, Roots far from the origin of the complex plane may have large
      errors due to the numerical instability of the series for such
      values. Roots with multiplicity greater than 1 will also show larger
      errors as the value of the series near such points is relatively
      insensitive to errors in the roots. Isolated roots near the origin can
      be improved by a few iterations of Newton's method.
  
      The Laguerre series basis polynomials aren't powers of `x` so the
      results of this function may seem unintuitive.
  
      Examples
      --------
      >>> from numpy.polynomial.laguerre import lagroots, lagfromroots
      >>> coef = lagfromroots([0, 1, 2])
      >>> coef
      array([  2.,  -8.,  12.,  -6.])
      >>> lagroots(coef)
      array([ -4.44089210e-16,   1.00000000e+00,   2.00000000e+00])
  
      """
      # c is a trimmed copy
      [c] = pu.as_series([c])
      if len(c) <= 1:
          return np.array([], dtype=c.dtype)
      if len(c) == 2:
          return np.array([1 + c[0] / c[1]])
  
      m = lagcompanion(c)
      r = la.eigvals(m)
      r.sort()
      return r
  
imports: from __future__ import division, absolute_import, print_function
  import warnings
  import numpy
  import numpy.linalg
  from numpy.core.multiarray import normalize_axis_index
  from .None import polyutils
  from ._polybase import ABCPolyBase
label_desc: Use image node_id 23 for calling a global function with example usage: lagroots(c) and returns: r, np, np