Forums >> Revit Building >> Technical Support >> If/Then & Yes/No Parameter Condition

mjm223

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Joined: Mon, Feb 10, 2014
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I'm trying to create a condition in a family where a dimension changes depending on which Yes/No parameter is checked. Here's an example of what I want to do:

Let's say I have a wall-based family of a wall-mounted panel. I have a length type parameter that measures how far the panel projects from the face of the wall it's hosted to. Let's call this parameter "Depth". I then have three Yes/No parameters called "A", "B", and "C". 

I want to make a formula for the "Depth" parameter that creates the following condition:

If only "A" is checked, then "Depth" = 2". If only "B" is checked, then "Depth" = 4.5". If only "C" is checked, then "Depth" = 8". In any other condition (meaning if none are checked or if more than one are checked), then "Depth" = 1".

Is it possible to create this condition in Revit?

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ronmalit

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Joined: Thu, Mar 29, 2012
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hi  =)

try and derive from this:

if(and(A, B), 1 mm, if(and(A, C), 1 mm, if(and(B, C), 1 mm, if(A, 2 mm, if(B, 4.5 mm, if(C, 8 mm, 1 mm))))))

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mjm223

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Joined: Mon, Feb 10, 2014
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Beautiful!! That worked!!! Thank you very much!!!

I've been having such a hard time getting used to the syntax of formulas, especially when I'm trying to get multiple values like in this situation.

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mjm223

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Joined: Mon, Feb 10, 2014
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*BONUS QUESTION!!!*

Is there a formula I can apply to the three Yes/No parameters so that when I check one of the three, the other two automatically uncheck?

Ideally, I want it so that only one Yes/No parameter can be checked at a time. For example, if "A", "B", and "C" are Yes/No parameters and "A" is checked, then "B" and "C" should automatically be unchecked. If I check "B", the "A" and "C" should automatically be unchecked, etc.

I can get this to work when there are only two Yes/No parameters. For instance, if there's only "A" and "B", I can apply the formula "A" = not("B"). But I can't seem to apply this same logic when there's more than 2 Yes?No parameters.

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zsmith3

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Joined: Mon, Mar 28, 2011
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I have attempted the procedure you describe in the bonus question, but have never found a way to get it to truly work. I would be interested if someone else could enlighten us both.

My work-around at the time was to nest my individual A, B, and C's into a parent family, and control them with a family type parameter.

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