drill pattern

[jimtoner]

Is it possible to insert an IF THEN ELSE statement in a rectangular array? 

say I have a typical cabinet side, if the side is 17" or less it would require 3 screws but if it is greater than 17"  but less than 28" it would require 4 using my formula for spacing.  I'm new  to this so please be patient thanks in advance..

[Kent1Cooper · Accepted solution]

This is a job for (cond) rather than (if).  Read about how it works in the AutoLisp Reference.  You could have more size categories than below, but let's say if the length is more than 28" it should be 5 screws, and it would never be long enough to require more than that:

(setq NumberOfScrews

  (cond

    ((<= edgelength 17) 3)

    ((<= edgelength 28) 4)

    (5)

  )

)

[jimtoner · Accepted solution]

Thank you, I look forward to learning this, your help is greatly appreciated.