using getvar for calculations

I'm back with another simple question. How do you use a system variable in a calculation to set another variable? I'll use the DIMSCALE variable for an example. Let's say I want to write an equation using the DIMSCALE variable to help set another variable. What's the proper format? I've tried several variations of:



(getvar "dimscale")/2



but no dice yet.


TIA



MechMan

 

(/ (Getvar "DIMSCALE") 2.0)

 

Another example:

(setvar "dimscale" (/ r1 2.0))

to set dimscale (or other var) to a value.

Bill

 

Thanks!



MechMan

 

Ok, here's a continuation of this subject. What was offered above works great for some commands but now I want to scale my limits based on the DIMSCALE variable but the LIMITS command doesn't seem to like it. I've tried different variations of:



LIMITS;0,0;(*12 (getvar "dimscale")),(*9 (getvar "dimscale"));



Note: this is a button macro I'm creating. I don't know LISP.



What I'm trying to do is to set the max limits to be "DIMSCALE" x initial value given (x=12,y=9) in a template file.



Yes it's probably crude but it's all I know.



Any ideas on how I can get this to work?



MechMan