Computing basis of Riemann Roch space

[chandra chowdhury]

I am trying to find the basis of Riemann Roch space. 

But I am getting following error. 

1
33
(x, y - 1) + (x, y + 1) + (x - 2, y - 21) + (x - 3, y - 17) + (x - 3, y
+ 17) + (x - 20, y + 18) + (x + 17, y + 4) + (x + 14, y - 9) + (x + 11,
y + 11) + (x + 8, y + 13) + (x + 7, y + 9)
Traceback (click to the left of this block for traceback)
...
   ? expected intvec-expression. type 'help intvec;'

My code: 

x,y = PolynomialRing(GF(43), 2, 'xy').gens()

X = Curve(x^3 + x+1-y^2)

print X.genus()

pts = X.rational_points(algorithm="bn")

print len(pts)

inds =[0,1,2,4,5,11,15,18,23,27,29]

ninds = [i for i in range(33) if not(i in inds)]

orbit = [pts[i] for i in inds]; 

supp = [ (1, pts[i]) for i in inds]

D = X.divisor(supp)

print D

basis = X.riemann_roch_basis(D)

[Kwankyu]

Hi,

You may want to look into

https://trac.sagemath.org/ticket/22982

Cheers.