Unable to use equations / global values in linear patterns definitions

Hi ya,


I am creating front panel plates for my modular synth. The design I am creating uses 'panel width' and 'panel height' global values  and I wish to have it take a two equations that define the number of holes vertically and horizontally based on the width and height.

I understand this it possible from this video: https://www.youtube.com/watch?v=SIj39Glvi9E&t=310s

I also tried the fix mentioned in this reponse, without luck:  

 

Is it possible to use equations / global variables with linear patterns as shown in the video demonsrtation?  Any help would be greatly appreciated.