Python Basics. Lists in GH to Python? and advice on a recursive function?

Hi,
this is my first post. I've reached the point of grasshopper knowledge where I need to build a recursive function and decided to go with Python as my language.

I understand the basic principals of recursive functions, but I get stuck on the basics of python in grasshopper.

First, how do I manage a GH list input as a list in Python?

I would believe x[0] would retrive the first item in the list, not the first position/letter of the last item in the GH list..

Studied atlv.org, code.algorithmicdesign.net, designalyze.com without success.

(Copy&paste-GH-functions, HoopSnake nor Loop won't solve my recursive problem)

Last... My end goal is in the form below:

α₀x = ξ₀

(l_j-ξ_i-1)α_i + ξ_i-1= ξ_i

Where α is a GH list of floats (Galapagos intervalls of 0.00-1.00),

the size α of will govern my end condition.

x is one value, integer.

l_jis a GH tree with 4 levels {0,0,0,0} but only one value in the perimeter branch.

To the more experianced out there, do you foresee obstacles with the above? Any inital tip? or a complete solution? ;)

Replies to This Discussion

Permalink Reply by Peter Fajers on February 5, 2015 at 9:10am

Found in debugging an error.. Corrected version:

from Grasshopper import DataTree

pylist = [list(i) for i in alpha.Branches]
outputList = []

for j in range(pylist.Count):
for k in range(len(pylist[j])):
if k == 0:
p = pylist[j][k]*X
outputList.append(p)
if k != 0:
p = (lj[j]-outputList[len(outputList)-1])*pylist[j][k]+outputList[len(outputList)-1]
outputList.append(p)

a = outputList
print a

Permalink Reply by Cesar Requejo on February 19, 2019 at 7:40am