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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    11840x  
Comments   Tell a friend
applies to: AutoCAD ·

See also:
Tip 11179:Select objects in negative elevation or in a given 3D octant.
Tip 11171:Total number of layouts as a field.
Tip 11076:Reading 3D point matrix from a CSV file.
Tip 11054:Difference volume (3D solid) between two TIN surfaces (sets of coordinates)
Tip 11025:How to create an axis of two curves? (average curve)


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