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CAD tip CAD tip # 1366:

   
Question CAD 
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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    18841×  
Prices - CAD eShop:
applies to: AutoCAD ·

See also:
Tip 14048:List of disks, CD-ROM drives, USBs and other disk functions for LISP.
Tip 14027:3D heart from the heart.
Tip 14017:Voronoi diagrams in AutoCAD.
Tip 14007:Workaround for the missing (vlax-create-object) in AutoCAD LT (voice, clipboard, etc.)
Tip 14006:Universal MsgBox in AutoLISP.


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