Parametric Family- Formula

[shoubhikm_cess1]

I'm trying to use 'ABS' syntax in one of my duct fitting parameter where multiple value is needed. In this case when I put First value, its work fine. But for others value it didn't work. Even when I write the Formula, It shows invalid Function.

My value is - 7 3/4", 9 1/4", 10 1/2", 11 1/4". 

So! How can I write the whole Formula with the using of 'ABS' ?

[iainsavage]

Could you provide more detail of what you want the formula to achieve? Write it in words for someone to translate into Revit syntax e.g if (condition) then (do this) otherwise (do something else), etc.

[ChitnisPrateek]

There is a link below where you can see the examples, and I agree with @iainsavage can you please provide a more detailed explanation of the formula you are trying to create? 

1. https://gtu.ge/Arch/Faculty/Multimedia/Resources/Revit/Help/filesUsersGuide/WS1a9193826455f5ff-4f6d1...

[miranNDQ9Y]

This is one of duct fittings which are Oval Duct to Round Duct transition. In this case Im unable to justify how the "ABS" formula works.

[iainsavage]

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@miranNDQ9Y :

This is one of duct fittings which are Oval Duct to Round Duct transition. In this case Im unable to justify how the "ABS" formula works.

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Is that a question?

It is saying "if the absolute value of height minus diameter is greater than the absolute value of width minus diameter then make Length 1 equal to the absolute value of height minus diameter, but if that condition is not true then make Length 1 equal to the absolute value of width minus diameter."