CAD Forum - tips, tricks, discussion and utilities for AutoCAD, Inventor, Revit and other Autodesk products [www.cadforum.cz]
Cesky English Deutsch
Login/Register:
 Visitors: 3601 

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    12465×  
Comments   Tell a friend
applies to: AutoCAD ·

See also:
Tip 11511:Assigning elevations to 2D contours (isolines).
Tip 11505:Get name of the original Revit BIM model from DWG files in AutoCAD.
Tip 11502:How to detect DWG files created as an export from Autodesk Revit?
Tip 11492:Adding selected numbers in drawing texts - counting numbers (GrSelNum).
Tip 11409:Catalog of all available hatch patterns.


Back   All CAD Tips All CAD tips&tricks

How to make a PDF file from your drawing? « | » Where to find a library of traffic signs for AutoCAD?

Have we helped you? If you want to support the CAD Forum web service, consider buying one of our CAD applications, or our custom software development offerings, or donating via PayPal (see above). You may also add a link to your web - like this "fan" link: CAD Forum - tips, utilities, blocks for Autodesk products
CAD:    OS:    Categ: 
Text:  FAQ glossary   



Featuring:
Save your floating licenses (NLS) consumed by inactive users - free unused licenses with
LogOff 2006 More info


Please use these tips at your own risk.
CAD Studio (Xanadu) is not responsible for possible problems that may occur as a result of using any of these tips.
TOPlist