code: def legsub(c1, c2):
      """
      Subtract one Legendre series from another.
  
      Returns the difference of two Legendre series `c1` - `c2`.  The
      sequences of coefficients are from lowest order term to highest, i.e.,
      [1,2,3] represents the series ``P_0 + 2*P_1 + 3*P_2``.
  
      Parameters
      ----------
      c1, c2 : array_like
          1-D arrays of Legendre series coefficients ordered from low to
          high.
  
      Returns
      -------
      out : ndarray
          Of Legendre series coefficients representing their difference.
  
      See Also
      --------
      legadd, legmulx, legmul, legdiv, legpow
  
      Notes
      -----
      Unlike multiplication, division, etc., the difference of two Legendre
      series is a Legendre series (without having to "reproject" the result
      onto the basis set) so subtraction, just like that of "standard"
      polynomials, is simply "component-wise."
  
      Examples
      --------
      >>> from numpy.polynomial import legendre as L
      >>> c1 = (1,2,3)
      >>> c2 = (3,2,1)
      >>> L.legsub(c1,c2)
      array([-2.,  0.,  2.])
      >>> L.legsub(c2,c1) # -C.legsub(c1,c2)
      array([ 2.,  0., -2.])
  
      """
      return pu._sub(c1, c2)
  
imports: import numpy
  import numpy.linalg
  from numpy.lib.array_utils import normalize_axis_index
  from .None import polyutils
  from ._polybase import ABCPolyBase
label_desc: Use image node_id 6 for calling a global function with example usage: legsub(c1, c2) and returns: pu