I dont understand why the if-node outputs a wrong result, when running through chosen one of two data inputs. I can manage to do it in python, but would like the dynamo node to work correctly, as the next person looking at this script might not be familiar with python. Seems like the list len is b…

Try searching the forums for similar scenarios first next time. This question comes up quite frequently. This issue is with how the If node handles list structure with its inputs. The inputs must match in structure and length. In order to pass an entire list as an output option, you have to use a De…

Not the false, the shortest list…irrespective if its plugged into the true or false [image] If statement wrong output Revit Hello, I have a problem with 2 lists. List A has 4 items en list B has 6. If “true” I expect to get list A and if “false” list B. Somehow in both…

Thanks for the quick answer and sorry for not being thorough enough searching the forums. Any idea why the behavior works like this and what would is the use for the if statement node then?

As I mentioned, it expects matching list structure and length. So every true/false option should have a condition (test) to determine which respective output it returns. [image]

[image] Nick_Boyts: it expects matching list structure and length I was recently doing something similar and I just realized a way around this limitation of equal list length requirement. I wanted the if node to be a sort of switch toggled by the user inputting a single bool. My idea is to fe…

This is actually the standard workaround for filtering lists with uneven lengths. Typically it’s written in shorthand like this: i = test?0:1; [returnTrue,returnFalse][i]; or [returnTrue,returnFalse][test?0:1];

If-statement gives wrong result

Lists-Logic

RDAOU October 8, 2021, 1:15pm 3

Not the false, the shortest list…irrespective if its plugged into the true or false

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If-statement gives wrong result

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