Excluding values from the list? How?

I have a list with some numbers.

Now, I want to exclude the first and the last value in the list.

Or exclude the first two and the last two values in the list. How can I do that?

Thank you.

Replies to This Discussion

Permalink Reply by Michael Pryor on August 2, 2011 at 12:54pm

cull

Permalink Reply by djordje on August 2, 2011 at 1:12pm

thank you for the reply. I am still a Grasshopper beginner. Here is what I got from the "Cull" help:

As far as I understood this means I need to edit my Boolean value manager each time I change my list.

List that has 10 values in it, does not satisfies with the same "true, false" order as a list that has 9 values in it.

An example of a Cull Pattern operation. Input:

List = {A, B, C, D, E, F, G, H, I, J, K, L, M, N}
Pattern = {True, True, False, False}

Output:

List = {A, B, E, F, I, J, M, N}

So either I did not understand this "cull" component, or this is not a way to solve this problem.

I am looking for universal solution, that will allow me changing my input lists, but that will always result with excluding the first and last values from the list; or first two, and last two; or first three and last three... and so on.

Permalink Reply by Michael Pryor on August 2, 2011 at 1:54pm

sorry for the brief response, I am at work and saw your inquiry and wanted to give some hint of what to do in the few seconds I had. You are correct cull pattern is a Boolean operation. I meant to use cull index. Again it was a very brief suggestion "not thought out". Dimitri's suggestion seems accurate for more complex situations. Here is what I was talking about. Only good I think for the first and last of lists.