Forums >> Revit Building >> Technical Support >> Min Height formula not working :(

muffles

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Joined: Fri, Apr 3, 2009
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I've been searching the forum and can't find anything on this, so maybe someone out there has an answer inside their head for me -

I'm kind of new to using formulas (so it could be something obvious I'm missing), although I've made bunches of basic families.  Right now I'm attempting to add a Min Height parameter to a family.  This is the formula I'm using:

if(or(and(Min Height<10", Min Height >100'), or(Min Height=10", Min Height=100')), Min Height, if(Min Height<100', 100', 10")

I get an error message saying I have a circular chain of references.  Any thoughts on how to fix this?  

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tim123

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Joined: Tue, Apr 12, 2005
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Can you explain what you trying to achieve?  It would appear that for a Min Height parameter you would just need:

if (Min Height<10", 10", Min Height)

You receive that error message if you are including the same parameter in the formula as the parameter itself, eg

Min Height = Min Height + 10, or

Min Height =if (Min Height<10, 10, Min Height) 

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coreed

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Joined: Fri, Feb 10, 2006
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your formula contradicts itself. if you can state how you want this formula to function in terms of Min Height we can come up with something a lot cleaner i think.

it looks like you want Min Height set to 10" if someone enters a value less than 10" or greater than 100'. anything that equals 10" to 100' will be accepted as Min Height ? if that is the case, then this formula should work.

 If ( or( Min Height <10", Min Height > 100'), 10", Min Height)

hth

-----------------------------------

best regards,

coreed,aia

bmpArchitects,Inc.

"Revit has to be implemented, Not installed." 

Long Live Revit

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muffles

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Thanks guys.  This is starting to make sense.  My family is a hanging canopy, and I want it to have a minimum height of 10" below the ceiling, and a max of 100' below.  

Sorry for the errant smiley in my previous post.  That was not supposed to be there. 

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tim123

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Joined: Tue, Apr 12, 2005
1310 Posts

Try this one:

=if(Length < 10", 10", if(Length > 100', 100', Length))

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coreed

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Joined: Fri, Feb 10, 2006
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ditto

=if (Min Height < 10", 10", if (Min Height > 100', 100', Min Height))

-----------------------------------

best regards,

coreed,aia

bmpArchitects,Inc.

"Revit has to be implemented, Not installed." 

Long Live Revit

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muffles

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