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CAD tip CAD tip # 1366:

Question CAD 
 %  platform  category 
Q - question

How to generate a random number using AutoLISP?

A - answer Use the following function for a LISP generator of pseudo-random numbers:
(defun rnd (/ modulus multiplier increment random)
  (if (not seed)
    (setq seed (getvar "DATE"))
  )
  (setq modulus    65536
        multiplier 25173
        increment  13849
        seed  (rem (+ (* multiplier seed) increment) modulus)
        random     (/ seed modulus)
  )
)
Each call of the function (rnd) then returns a pseudo-random number in the range (0,1). E.g. to get random integers from 0 to 20, use (fix(* 20 (rnd))).
ACAD
100% *  CAD 
1.6.2001    12124x  
Comments   Tell a friend
applies to: AutoCAD ·

See also:
Tip 11354:Animate dyn.block parameters and dim.constraints in AutoCAD DWGs.
Tip 11295:Iterative Move, Scale and Rotate - till boundary touch.
Tip 11289:Adding, multiplying and rounding numbers inside DWG drawing texts.
Tip 11252:Applying STRETCH to 3D objects in AutoCAD.
Tip 11246:Easier hatching between two polylines - Hatch2L.


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