# Comparing XYZ of Points

So I have a single point and then a list of several points. I want to compare the first point to see if it matches any points in the list. If I run a simple ‘==’ function it runs true on all outcomes as it reads the fact they are all points not their XYZ location. I could extract individually the X, Y, and Z of the point and the points in the list and then run a compare on each. Problem is then how do I feed this information back in where X may be true in every case and then Y true in 2 cases and Z true in only case. I need a method that picks out the index where it reads true, true, true across each axis.

This got me thinking of ways of comparing the whole XYZ location at once. So I converted the numbers to string which allows me to compare the whole number across the numbers in the list. This works perfectly for what I need however I have come unstuck again. If I have a situation where im feeding in more than one point and want to cross check them all, if I convert to string it will obviously combine the all the numbers in the list into one. How can I run a compare on several points without having to call them out individually? The string remove is just removing the { } from the string. Maybe the initial way I started was a better method. Any ideas…?

My mistake… If I run the compare through the list.map node it works how I want

Okay stuck again! If I have a nested set of lists, with true and false values. How can I go through the list and pull out the index number of all the items that are true. I have tried the ‘If Equal Return Index’ custom node but it seems to return an empty list every time? The code block on the right shows the outcome I wish to achieve.

Is this what you’re aiming for?

Hi Dimitar - no not quite. I wish for it to list the index number of every instance where it says true. In your example the end list I would expect to see is the one below.

I’m not sure how this could be used exactly, but hopefully it solves your problem:

Drat now you got me really interested . Do you mind sharing what your process and end goal are?

Dimitar you beauty! That’s exactly what I needed. Wonder if you could elaborate on the latter part and explain what is happening? Here is my example mixing it around to check it still functions…and it does! I will show you my end goal once I have reached it. This is a very useful tool though

Dimitar,

Below shows what I wanted to achieve. In a nutshell:

• ``````     Extracting XYZ of analytical nodes
``````
• ``````     Extract Revit ID of analytical nodes
``````
• ``````     Push this information back into Revit for scheduling
``````
• ``````     Extract start and end points from the curve used to create structural framing
``````
• ``````     Compare this to the node points finding instances which match
``````
• ``````     Plug in the Revit ID for the nodes into a parameter in the framing family
``````
• ``````     Finished article: Have two schedules one for analytical nodes and one for structural framing members that can reference each other
``````

With the help of the Map node, the Count node gets the total length of each sub list.

That number is reduced by one because lists in dynamo start from 0 and then it is fed into a number sequence (which again starts from 0) to match the list indices.

Finally because you’ve already defined a conditional statement, we can reuse that conditional statement to filter only the list indices that match your predetermined conditions.

Good job with mapping the analytical nodes to the beams. I guess this can be used to insert the forces from a structural analysis directly into the nodes?