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Forums >> Revit Building >> Technical Support >> Formula to not exceed value in family
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Joined: Tue, Oct 30, 2007
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I am looking to see if there is a formula that will not allow a object to exceed a certail length or depth. I don't want people to be able to design over the specified values, but can still insert any value up to that point.
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if(paramName>maxValue, paramName=maxValue) if(paramName<minValue, paramName=minValue) replace paramName with the name of the parameter the formula is in. My suggestion would be to actually make parameters called maxValue and minValue so that the max and min values can be adjusted in future use.
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Carl - rkitecsure[at]gmail.com
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stolen from revit help I think what you want is NOT(a>b) sort of thing Syntax for Conditional StatementsA conditional statement uses this structure: IF (<condition>, <result-if-true>, <result-if-false> This means that the values entered for the parameter depend on whether the condition is satisfied (true) or not satisfied (false). If the condition is true, the software returns the true value. If the condition is false, it returns the false value. Conditional statements can contain numeric values, numeric parameter names, and Yes/No parameters. You can use the following comparisons in a condition: <, >, =. You can also use Boolean operators with a conditional statement: AND, OR, NOT. Currently, <= and >= are not implemented. To express such a comparison, you can use a logical NOT. For example, a<=b can be entered as NOT(a>b). The following are sample formulas that use conditional statements. Simple IF: =IF (Length < 3000mm, 200mm, 300mm)IF with a text parameter: =IF (Length > 35', “String1”, “String2&rdquoIF with logical AND: =IF ( AND (x = 1 , y = 2), 8 , 3 ) IF with logical OR: =IF ( OR ( A = 1 , B = 3 ) , 8 , 3 )Embedded IF statements: =IF ( Length < 35' , 2' 6" , IF ( Length < 45' , 3' , IF ( Length < 55' , 5' , 8' ) ) )IF with Yes/No condition: =Length > 40 (Note that both the condition and the results are implied.)
Edited on: Tue, May 20, 2008 at 9:57:46 AM
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replace smiley faces with )
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to do this, create an extra parameter for each value you want to control. These will be "input" values. In your actual parameter (the one that controls some dimension, or value in the family) you will compare he "input" value to your MAX and/or MIN value, if the value is in range, then you will let it be the value, otherwise you will set the value, Below is an example: Input - a parameter of type length Value - a parameter of type length which controls the length of a sofa. I want to constrain the sofa to not less than 3' and no greater than 10', so as follows in the = area of the value parameter: if(or(and(Input<10', Input >3'), or(Input=10', Input=3')), Input, if(Input<3', 3', 10')) the above does the following, it tests to see if the Input is within the range of 3' or 10', if it is in that range, then we let Value equal Input, otherwise, it tests to see if Input is at the lower or higher extreme, and then sets the sofa's length to be either 3' or 10'. If a user put in 11, the above if statement would be false, so we'd then be testing to see if input is less than 3', which it isn't, so Value will be set to 10. Feel free to ask further questions about this, as I'm sure I didn't explain it perfectly, but hope this helps.
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Thanks for all the help i will try these out and report back
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Sorry, my syntax is incorrect as pointed out by Lunch. Instead of "paramName=maxValue" it would just be "maxValue" for that conditional statement value.
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Carl - rkitecsure[at]gmail.com
Need help? I'm probably in my chat room!
You fell victim to one of the classic blunders. The most famous is never get involved in a land war in asia, but only slightly less well known is this! Never go in against a Sicilian when death is on the line! |
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