topic Re: Numerical parameter formulas - is there a [this] variable? in Revit Architecture Forum

Numerical parameter formulas - is there a [this] variable?

Tupaia — Sun, 31 Mar 2019 12:02:57 GMT

Hi!
Quick question: is there a way to refer to the existing parameter in a formula? Like:

=[this]*2

=[this]+5

'this', of course, means the exising value.

I'd need this because I want to change multiple parameters (topo point Elevation in this case) at once.

Thanks a lot!

Best regards

Re: Numerical parameter formulas - is there a [this] variable?

barthbradley — Sun, 31 Mar 2019 15:31:11 GMT

The way you have it written is exactly right. =Parameter Name *2 or =Parameter Name +5. You can even put brackets around Parameter Name like you are you showing, which needs to be done in instances where Parameter Name contains certain characters.

Here's some other information and rules that may help you in writing formulas:

https://www.revitforum.org/tutorials-tips-tricks/1046-revit-formulas-everyday-usage.html

Re: Numerical parameter formulas - is there a [this] variable?

Tupaia — Sun, 31 Mar 2019 17:48:10 GMT

Thank you very much!
I still cannot get it to work, though.

Example: 2 walls with different height, both are selected. What's the exact formula to multiply the parameter 'Unconnected Height' by 2?

= (Unconnected Height) * 2

does not work - error message "the following string is not recognized: Unconnected Height"...

What's the 'magic symbol' for the variable itself?

Thanks!

Re: Numerical parameter formulas - is there a [this] variable?

barthbradley — Sun, 31 Mar 2019 17:55:24 GMT

I'm confused. Where you are writing this formula?

Re: Numerical parameter formulas - is there a [this] variable?

ToanDN — Sun, 31 Mar 2019 18:06:04 GMT

You can only do it for one wall or walls with identical 'Unconnected Height' value, by select the walls and enter "=2 * [the actual existing value, not this text]" in the 'Unconnected Height" box.

Re: Numerical parameter formulas - is there a [this] variable?

Tupaia — Sun, 31 Mar 2019 18:09:52 GMT

I guess you know what I mean - using the variable/parameter itself in the formula.

Not possible?

Thanks!

Re: Numerical parameter formulas - is there a [this] variable?

barthbradley — Sun, 31 Mar 2019 18:14:40 GMT

Wow, I totally missed your point. No, that's not possible.

Re: Numerical parameter formulas - is there a [this] variable?

Tupaia — Sun, 31 Mar 2019 18:30:55 GMT

Ok, thanks!

Unfortunate... I guess I will post that in the idea forum. Would be a super nice and quick way to adjust multiple object's parameters.

Best regards

Re: Numerical parameter formulas - is there a [this] variable?

ToanDN — Sun, 31 Mar 2019 18:43:58 GMT

@Tupaia wrote:

I guess you know what I mean - using the variable/parameter itself in the formula.

Not possible?

Thanks!

As I said, it is only possible when the value is exposed, meaning one wall or wall with identical Unconnected height. You could create a wall schedule, sort by Unconnected height, un-itemize rows to group them, and do it for each one.

Re: Numerical parameter formulas - is there a [this] variable?

Tupaia — Sun, 31 Mar 2019 18:55:52 GMT

Ok, but that's beside the point - being able to edit quickly.

I came across the idea because I wanted to lift a selection of 1000s of topo points by a value, without chaning to front view and moving them. Topo points have the parameter 'Elevation'. I thought I could just enter something like

=*+10

and be done.

The concept would be useful in many other cases, too, I think.

Thanks!