Exclude equal Cordinates from a LIST

Lists-Logic
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1

Hello! I have a list of lines with coordinates, I want to compare all X coordinates with X check which are the same and delete leaving only one!

Lista%20Cooerdenadas
Lista Cooerdenadas.JPG1313×660 134 KB

The problem is that I am trying to create “grids” from the axis of the walls, and when I have a wall cut in two, at the same X coordinate for example, it ends up creating 2 “gridlines” one over the other, hence the attempt to list the coordinates except for repetitions.
I’ve tried it in various ways, with list get at index and others, but I didn’t get results, the closest I could get this was to list groups in equal X coordinates “but some equals end up going to another list”.
I hope someone can help me! Thank you in advance.

2

It looks like you should be able to just use a List.GetItemAtIndex node, with 0 as the index, using proper list levels.

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3

I tried that, but it’s more complex, because the list keeps returning equal X coordinates, like the ones in the image.

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image.png1304×831 78.8 KB

4

The lines are grouped by the X coordinate of their start points, right? Theoretically, this should work then. Could you post the .dyn?

5

Yes, it follows attached …
Eixos_centros de paredes.dyn (8.4 KB)

At the end of the list I have to apply Grid.Byline and everything has to work without creating overlapping lines as it happens in the attached image

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image.png229×745 2.54 KB

6

You could also try to extend the lines untill they intersect, filter the lines that do and make a new line from start point of the first line and the end point (or most far away) of the second line.

7

ok, but I have no idea how to do that, because it’s pretty much my second attempt with Dynamo
and what I have at the moment is a list with all the line coordinates, I think it would be more complex to do that than just filtering the coordinates that have the corresponding “x” and “y” coordinates, don’t you think? … I’m seeing if I can get any results with pythoncorrespondentes não acha?

8

This looks to be an issue with the floating point accuracy of the X-coordinates. For example, one number might be 15.00000000000 and one might be 15.000000000001. In the watch node, it only shows 3 decimal places, so this isn’t immediately apparent.

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image.png1573×677 129 KB

If you round the numbers to a certain number of digits, it should work.

Eixos_centros de paredes_atualizado.dyn (25.9 KB)

3 Likes
9

Is rounding before comparing an option? Doubles are instable from nature.

2 Likes
10

yes i think you are right, its more complex to do it like i suggested to solve this, but its more challenging.
make it a game that you can enjoy
:slight_smile:

12

Can always make it an integer. Multiply it by 10^# of decimal digits for accuracy and turn it into an int.

13

Even though this code has something wrong, I finished it all, I generated the lists for the x and y start and end points, but now it doesn’t generate lines on all walls anymore, it skips several, I don’t know what’s wrong … I tried to change rounding the coordinates multiplying, but it didn’t work either …
Eixos_centros_paredes_v02.dyn (29.0 KB)
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Maybe the way is wrong? I’m trying a new alternative using this topic Join walls in intersecting / touching, which starts selecting walls and identifying their python intersections, but then I get a list with true and false, and I couldn’t filter it to display only true … What do you think? Should I keep trying in the previous method or start selecting and filtering the intersecting walls would be the best way?