Switch between lists if.

Hello, I have two lists of points, say 1 and 2. I want to use alternatively one list or the other depending on the occurrence of an event.

I start taking points consecutively from list 1; then, when point n+1 has higher x than point n, I switch to list 2. I use points on list 2 unless point n+m has lower x than point n+m-1; at this time I come back to list 1. And again as before , when point n+m+p is higher than point n+m+p-1 I go to list 2. I do so until the end of one list of points.

i saw I can get a list of 'true -false values' from the 'if minus' function, but how to switch , possibly automatically, between lists?

Thank you all!

Replies to This Discussion

Permalink Reply by David Rutten on April 19, 2015 at 6:10am

I doubt this is possible without custom scripting. The algorithm you describe requires customized looping and conditionals which is not typically possible using 'straight-up' Grasshopper components.

If you can post the two point lists and maybe a (partially) hand-drawn solution, I can try and come up with a script that does it automatically.

Permalink Reply by Vale on April 19, 2015 at 6:48am

Hello, I attach a simplified file. if you look at the solution, maybe I need something simple because actually I have just to merge the true values of a list.

Thanks!

Permalink Reply by Vale on April 19, 2015 at 6:54am

Here are the files

Attachments:

paths v1.gh, 13 KB
paths v1.png, 66 KB

Permalink Reply by David Rutten on April 19, 2015 at 12:22pm

Hi Valentina,

I must be very confused, the file you posted simply collects from two equally long lists the smallest value. But what I understood from your initial question was that you wish to extract consecutive values until the next value is less than the previous one. These are two very different problems.

You can use the Min component to find the lowest of two numbers: