cost() function in simplify.py

[BenoitDaviet]

cost() function doesn't output the correct number of points.
Here is an example : res should countain 21 elements whose type isn't "None", but instead there are 23 of them

`from cereals.src.openalea.cereals.simplification import cost
import openalea.plantgl.all as pgl

xn, yn, sn, rn = (np.linspace(0, 0.7, 155),
np.linspace(0, 0.4, 155),
np.linspace(0, 1, 155),
np.ones(155))

nb_points = 21
points = [pgl.Vector3(*pt) for pt in zip(xn, rn, yn)]

res = cost(polyline=points, nb_points=nb_points)

print(len(res)) # 155, OK
print(len([r for r in res if r])) # 23, instead of 21`

[pradal]

During the simplification, I can not remove extremal points (first and last point).
nb_point expresses only the nuber of internal point we want to keep in the polyline.

[BenoitDaviet]

Ok thanks, I understand for this example.
But the problem is that for a same value of nb_point (21), the number of points I obtained is not always the same : for some polylines I obtain 23 points (like in my code example), but sometimes I also obtain 22 or 21 points.

[pradal]

OK. I will look at it. Stay tuned.

[BenoitDaviet]

Thanks !