Data-List

Hallo dear all,

I creat a station-roof as foto below.

As you see on the edge of roof there are a top chord which above the bottom chord.

Now I try to creat web member between top and bottom chord.

Generelly I can connect the the points along the both chords in oder to made lines as web member.

Therefore there are 2 ways to do this:

First way:

I take the 2 curves(top and bottom chord) and divide it into the same number(green points).

Now we can see the problem, that the green points dosent match the red points. Coz the red points are made through ''Divide Domain'' and the green points are divided through 'divide curve'.

Second way:

I try to manage the data list using 'cull', 'sort list' and 'Decompose'..etc. to define the right series points points i want to take.(as foto below, blue mark)

I sort the list using 'Decompose' in X-Coordination in oder to get the first column points.

But seems it is possible to define 'only' one point at the same time.

How can I manage the data list in oder to get the first column points as foto 2 present?