def poly2leg(pol):
[pol] = pu.as_series([pol])<EOL>deg = len(pol) - <NUM_LIT:1><EOL>res = <NUM_LIT:0><EOL>for i in range(deg, -<NUM_LIT:1>, -<NUM_LIT:1>):<EOL><INDENT>res = legadd(legmulx(res), pol[i])<EOL><DEDENT>return res<EOL>
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.], [-1.,  1.])
>>> c = P.Legendre(P.poly2leg(p.coef))
>>> c
Legendre([ 1.  ,  3.25,  1.  ,  0.75], [-1.,  1.])