code: def poly2leg(pol):
      """
      Convert a polynomial to a Legendre series.
  
      Convert an array representing the coefficients of a polynomial (relative
      to the "standard" basis) ordered from lowest degree to highest, to an
      array of the coefficients of the equivalent Legendre series, ordered
      from lowest to highest degree.
  
      Parameters
      ----------
      pol : array_like
          1-D array containing the polynomial coefficients
  
      Returns
      -------
      c : ndarray
          1-D array containing the coefficients of the equivalent Legendre
          series.
  
      See Also
      --------
      leg2poly
  
      Notes
      -----
      The easy way to do conversions between polynomial basis sets
      is to use the convert method of a class instance.
  
      Examples
      --------
      >>> from numpy import polynomial as P
      >>> p = P.Polynomial(np.arange(4))
      >>> p
      Polynomial([0.,  1.,  2.,  3.], domain=[-1,  1], window=[-1,  1])
      >>> c = P.Legendre(P.legendre.poly2leg(p.coef))
      >>> c
      Legendre([ 1.  ,  3.25,  1.  ,  0.75], domain=[-1,  1], window=[-1,  1]) # may vary
  
      """
      [pol] = pu.as_series([pol])
      deg = len(pol) - 1
      res = 0
      for i in range(deg, -1, -1):
          res = legadd(legmulx(res), pol[i])
      return res
  
imports: 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 1 for calling a global function with example usage: poly2leg(pol) and returns: res