Pick the last element of a list

RE: Pick the last element of a list

Mueller — Tue, 14 Aug 2018 20:18:01 GMT

For lists, there are a few methods which are available through auto-completion. In this case, List.First() and List.Last() are methods to retrieve the first and last items of a list, respectively. They can also take an integer number as an argument which then indicates how many "first" or "last" members of the list are returned by the expression.

RE: Pick the last element of a list

Ingo — Fri, 03 Aug 2018 15:30:28 GMT

Here is probably something you might want to achieve - but there are problems with the graphics.

Ingo

RE: Pick the last element of a list

Heiko Hornef — Fri, 03 Aug 2018 09:29:45 GMT

I want to build walls on the outer lines. I think something like a Polyline would work, that connects all outer lines.

With my expression I already selected the lines but I need to know how I can use the output of the expression o make it a polyline.

If I put a node "polyline" behind the expression, how do I heave to define the inputs for it? I first thought it would work with the input definition "Polyline.byElement but If I choose this definition, the node doesnt work.

Heiko

RE: Pick the last element of a list

Ingo — Thu, 02 Aug 2018 16:01:13 GMT

I think if you somehow sketch the goal you're heading for it would be easier to give you a hint.

Do you want to...

... get a polygon on your outer lines?

... some points with offset to the outer lines?

...

RE: Pick the last element of a list

Heiko Hornef — Thu, 02 Aug 2018 14:18:30 GMT

I made an Expression with the following script now:

{
LinesGridX.Last(1),
LinesGridX.First(1),
LinesGridY.Last(1),
LinesGridY.First(1)
}

These are all the surrounding lines. My Problem is, that they are now values of an Expression and I dont know how to make lines out of them. Right now the Output of my Expression-node doesnt fit.

Do you know what I mean?

RE: Pick the last element of a list

Ingo — Thu, 02 Aug 2018 13:51:03 GMT

.... so in your case LinesGridX[NumberGridLinesX]

RE: Pick the last element of a list

Ingo — Thu, 02 Aug 2018 13:49:55 GMT

Why don't you use your NumberGridLinesX / Y sliders / values?

There you already have you maximum value (maybe minus 1)