Stretch another parameter / chaining two linear parameters

[Anonymous]

I am trying to make a dynamic block of a flexible duct through a wall. I have two linear parameters, thickness of the wall and the extension of the duct. I've got most of the actions figured out, but I ran into some problems when I added an array action. Basically I want the array to fill the entire duct as I stretch it to length. When I try to stretch using the wall thickness parameter first, the array doesn't function properly. But when I stretch using the other parameter, the array works fine.

I think the problem is with stretching or chaining the two parameters, hence the title.

[Libbya · Accepted solution]

I think the following screencast will show what you are looking for.  

[j.palmeL29YX]

So?

see attachment.

cadder

[EDIT]: It's not yet perfect. The right grip doesn't move correctly. @Libbya posted a better one solution.

[Anonymous]

Thanks heaps @Libbya! I replicated it on my block and finally got it to work. I have a couple of questions, if you don't mind. Why was there a need to make the second parameter for the array action?Also, how did you figure out that the right parameter was included on the left stretch? That must have been the reason why the second right grip doesn't move with the stretch.

[Libbya]

The two arrays need to be activated by both the wall thickness and overall length parameters.  Therefore, both array parameters need to be chained.  It would be possible to do that without the added parameter but it was mentally simpler to use the second chained parameter and have each of the main parameters unchained and act on the chained parameters.