Proposal of alternative solution for Cross Reference

Replies to This Discussion

Permalink Reply by Andrew Heumann on February 3, 2017 at 6:48am

I had some help from this blog. Here's a script that should do what you're asking:

private void RunScript(DataTree<object> data, ref object A)
{
var cp = CartesianProduct<object>(data.Branches);
DataTree<object> results = new DataTree<object>();
int counter = 0;
foreach(IEnumerable<object> branch in cp){
results.AddRange(branch, new GH_Path(new[]{0,counter}));
counter++;
}
A = results;
}
// <Custom additional code>
static IEnumerable<IEnumerable<T>> CartesianProduct<T>
(IEnumerable<IEnumerable<T>> sequences)
{
IEnumerable<IEnumerable<T>> emptyProduct =
new[] { Enumerable.Empty<T>() };
return sequences.Aggregate(
emptyProduct,
(accumulator, sequence) =>
from accseq in accumulator
from item in sequence
select accseq.Concat(new[] {item}));
}

Attachments:

• CartesianProduct.gh, 5 KB

Permalink Reply by Jaeman PARK on February 28, 2017 at 2:21am

Hello Andrew,

Sorry for my late reply, and thanks for your script!

I'm not good at making VB or C# component in GH. So your attached file helps me a lot.

I have another question. Now I want to make some combinations as upper strict or lower strict.

http://www.grasshopper3d.com/forum/topics/cross-reference-what-is-i...

Let's say that I have 20 lotto balls. And I'll choose 5 balls from them. How can I make all different combinations which have 5 items?

Really thanks for your work again.

Regards,

Permalink Reply by Mohamed Naeim on February 28, 2017 at 6:31pm

Hi, 

I did few experiments with combinations and permutations, 

https://naeimdesigntechnologies.wordpress.com/2016/12/23/permutatio...

you will find few examples (with files) in my discussions 

regarding The cross reference thing, can you add the file 

Permalink Reply by Mohamed Naeim on February 28, 2017 at 8:03pm

http://www.grasshopper3d.com/forum/topics/permutations-vs-combinations

Permalink Reply by Mohamed Naeim on February 28, 2017 at 8:04pm

http://www.grasshopper3d.com/forum/topics/every-possible-combinatio...