filter into a dynamo script

[Anonymous]

Hi all
i always stayed away from Dynamo as it looked very deep and dificult to me.
Last week i gave it a chance and now I really like to creat script .

on my HVAC plans, I managed to create a script to number automaticly my Ducts and Ducts fittings.
My script catch the system abbreviation and mix it with numbers.

To make my script better, I would like to start the numer at 0 for each system.

To explain myself: actually on a plan with two systems (supply air / Exhaust air), my script create me a duct number SA-01/SA-02/SA-03… but also a EA-05/EA-06
Actualy, the number follow the last one doesn’t matter on witch system it is.

I would like to have a duct number SA-01 but also a EA-01
Do you understand me?

I tryed to select the elements but this node allows me to do it nly with selection not with the system (with TAB)
a filter node could be an option but I don’t really understand them,

Does anyone could help me please?

Thanks
Baptiste

[L.Maas · Accepted solution]

Good that you make th effort. You will not be sorry.

Something like this might do the trick to get you further

So what I do is:

-Extract the system abbrevation from the elements.

-Use those to group all elements with the same system abbrevation

-Use a count node to count all elements in a group
-Use the count to create a sequency (1 to count)

-Then create the string and store them in a parameter (I used comments)

Script attached

Note: When posting a question about Dynamo, it helps if you can also attach the script, saves recreating the script

[Anonymous]

thanks Louis,

I finaly get where I wanted to go with the help of 2 colleagues.

We also used your strategy .

Here is the script for 4 different systems

[MuirEng]

try also researching / posting Dynamo questions at https://forum.dynamobim.com/