How to state "check if condition is true, true then.., false leave as it is"

[Anonymous]

Hello again. 

Today I am here with a very basic newbie question 🙂

I am trying to write and if formula.

All these parameters are dimensions.

It should be like " Parameter 1 = IF(Parameter 1 > Parameter 2, Parameter 2 - 200, Parameter 1)

And now you saw where the error is, for false condition, I am referring to the parameter itself. What I need to do is just the thing I wrote, but it creates a circular chain of references so revit does not accept it.

What is this very basic thing that I am missing here? Probably I will be ashamed after i realize what was going on 🙂

Thank you in advance.

[Anonymous]

Btw I am aware that I can make another parameter for checking and it will not give any errors then, the only thing I am curious is is there anything can be done for a statement like " check the condition, if it is not like that, leave my parameter as it is?" 

[Anonymous · Accepted solution]

Show us your actual formula.

I attach a screen shot of a basic IF statement:

[martijn_pater · Accepted solution]

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@Anonymous wrote:

All these parameters are dimensions.

It should be like " Parameter 1 = IF(Parameter 1 > Parameter 2, Parameter 2 - 200, Parameter 1)

And now you saw where the error is, for false condition, I am referring to the parameter itself. What I need to do is just the thing I wrote, but it creates a circular chain of references so revit does not accept it.

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It is how @Anonymous says, but I think you need to associate a calculated parameter to the dimension instead of the Parameter 1, as below:

(input) Parameter 1 = x
(input) Parameter 2 = y
(associated to dimension) Parameter 1_calculated = if (Parameter 1 > Parameter 2, Parameter 2 -200, Parameter 1)

Could you elaborate on 'All these parameters are dimensions', what dimensions where? As to provide an answer to the circular chain of references issue.

[Anonymous]

Thank you for your replies. I figured out as you explained with multiple parameters supporting each other.