Forums >> Revit Building >> Technical Support >> PARAMETER FORMULA HELP!!

cryanbrandon

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**Revit 2012**

We are trying to figure out how to write an IF/THEN formula any help would be greatly appreciated.

On a titleblock we are looking at having parameters to switch text out quickly, we have heading A - D and Blank

I would like it if Heading A is checked then B,C,D, AND BLANK, ARE OFF (UNCHECKED)

This goes for each heading and if Blank is checked then all other heading versions are OFF(UNCHECKED).

Thanks in advance!

Ryan

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teafoe5

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I think  Heading - A=not(Heading - B)not(Heading -C)not(Heading -D)

            Heading - B=not(Heading -A)not(Haeding -C)not(Heading -D)

etc..

Make sure you spell everything exactly the same as you have it in you parameter names. 

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cryanbrandon

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I tried it but it doesnt like using multiple NOT's, it wouldnt work, am i missing another annotation to seperate them?

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teafoe5

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I would have to do a little more research but I was thinking:

Heading - A=not(Heading - B,Heading -C,Heading -D)

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cryanbrandon

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That sounds like it should work but when we enter it in it gives the below error,

"Incorrect arguments to function"

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TKennedy

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I don't think you're going to be able to do what you want, you're going to end up with circular references. For instance, as soon as you enter the formula for Heading A, you won't have any control over Heading A. It will be controlled by the other parameters.

Having said that, if you want to play with it yourself this formula should work:

Heading A =not(or(Heading B, or(Heading C, Heading D)))

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cryanbrandon

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Yup thats what we were thinking we got it to work but started giving the circular ref error.  Thanks a lot for the help!!

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TKennedy

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Does the blank parameter control the visibility of anything, or was it just there to control other parameters?

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cryanbrandon

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The blank was there so that if we selected it THEN all others would be OFF.  It didnt actually have anything associated to it

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