sum components of a list

The problem is as follows:

I have a list of 12 items and want a new list whose elements are sums of three of the elements of the original list. elements are vectors.

conseptual attached an image and code in Python

any help would be very useful!

thanks

Attachments:

Replies to This Discussion

Permalink Reply by David Rutten on April 29, 2012 at 10:09am

Hi Fernando,

you can use the PathMapper to group your long list of vectors into sublists of 3.

David Rutten

david@mcneel.com

Poprad, Slovakia

Attachments:

SumInThrees.gh, 2 KB

Permalink Reply by fernando molas garcia on April 29, 2012 at 5:41pm

thanks david for your reply

I fail to see your raise. Anyway, my intention is to this purpose in the Python code. Ivastaria an example for how to adapt to my code. If you look at the attachment I am not far to do!

Attachments:

orbit3.gh, 5 KB
orbit3.3dm, 33 KB

Permalink Reply by David Rutten on April 30, 2012 at 1:02am

Ah, I don't do python support (I suck at it), but in C# it would be something like this:

List<Vector3d> vectors = ......;

List<Vector3d> result = new List<Vector3d>();

for (int i = 0; i < vectors.Count-2; i += 3)

{

result.Add((vectors[i] + vectors[i+1] + vectors[i+2]) / 3.0);

}

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Giulio Piacentino on April 30, 2012 at 2:51am

Hi again Fernando,

what David wrote would be:

# choose list access for "vectors", and type hint it as Vector3d result = [] for i in range(0, len(vectors) - 2, 3): result.append((vectors[i]+vectors[i+1]+vectors[i+2]) / 3.0)

Thanks,

- Giulio
________________
giulio@mcneel.com

Permalink Reply by fernando molas garcia on April 30, 2012 at 10:11am

David, all this stuff with the sum of the list is to solve this problem ...

http://www.grasshopper3d.com/forum/topics/vector-forces

Permalink Reply by fernando molas garcia on April 30, 2012 at 10:05am

If that's what guys look!
I complicate the issue with the function "range ()" until I realized it works!