Re: Non-repeating Random Numbers

This WebDNA talk-list message is from

2002


It keeps the original formatting.
numero = 43039
interpreted = N
texte = John,> >That's not random, though. A true random number sequence >can contain a very large run of identical values. >Point taken :)Ok, this appears to work:[!] --- Generate 6 unique numbers between 1 and 54 --- [/!] [text show=f]unique_numbers= [/text] [math show=f]found=0[/math] [loop start=1&end=20] [text show=f]random_number=[math]ceil([RANDOM format=float]*(54))[/math][/text] [showif [unique_numbers]! [random_number] ] [text show=f]unique_numbers=[unique_numbers][random_number] [/text] [math show=f]found=[found]+1[/math] [/showif] [showif [found]=5][break][/showif] [/loop] [unique_numbers]I changed a few thing so I could understand the logic better, namely:1) I renamed the variables to something more literal that I could wrap my mind around, and2) I used (The actual space bar) as a delimiter instead of '+' because '+' was confusing me into thinking I was doing math at first and also the display of the final numbers is cleaner with . Seems to work ok for the time being, but if I want to manhandle the [unique_numbers] variable later (with [grep] or whatever) I'll probably have to use a more tangible delimiter...don't really know yet and I'm just rambling..One question: regarding [loop start=1&end=20]: Theoretically, the process could loop 20 times in a row and not generate unique numbers (basically, end=20 could occur before [found]=5) and if this happened then the loop would stop without generating 6 numbers, right? Should I increase this limit to, oh, say 1000 or something to avoid this (unlikely) scenario?Thanks John!-Dan ------------------------------------------- http://www.StrongGraphicDesign.com (208) 319-0137 | Toll-free p/f 877-561-1656------------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list . To unsubscribe, E-mail to: To switch to the DIGEST mode, E-mail to Web Archive of this list is at: http://search.smithmicro.com/ Associated Messages, from the most recent to the oldest:

    
  1. Re: Non-repeating Random Numbers - CORRECTION (Dan Strong 2002)
  2. Re: Non-repeating Random Numbers - CORRECTION (Brian Fries 2002)
  3. Re: Non-repeating Random Numbers - CORRECTION (Stuart Tremain 2002)
  4. Re: Non-repeating Random Numbers - CORRECTION (Dan Strong 2002)
  5. Re: Non-repeating Random Numbers - CORRECTION (Stuart Tremain 2002)
  6. Re: Non-repeating Random Numbers - CORRECTION (Andrew Simpson 2002)
  7. Re: Non-repeating Random Numbers - CORRECTION (Andrew Simpson 2002)
  8. Re: Non-repeating Random Numbers (Andrew Simpson 2002)
  9. Re: Non-repeating Random Numbers - CORRECTION (Dan Strong 2002)
  10. Re: Non-repeating Random Numbers - CORRECTION (Dan Strong 2002)
  11. Re: Non-repeating Random Numbers (Dan Strong 2002)
  12. Re: Non-repeating Random Numbers (John Peacock 2002)
  13. Non-repeating Random Numbers (Dan Strong 2002)
John,> >That's not random, though. A true random number sequence >can contain a very large run of identical values. >Point taken :)Ok, this appears to work:[!] --- Generate 6 unique numbers between 1 and 54 --- [/!] [text show=f]unique_numbers= [/text] [math show=f]found=0[/math] [loop start=1&end=20] [text show=f]random_number=[math]ceil([RANDOM format=float]*(54))[/math][/text] [showif [unique_numbers]! [random_number] ] [text show=f]unique_numbers=[unique_numbers][random_number] [/text] [math show=f]found=[found]+1[/math] [/showif] [showif [found]=5][break][/showif] [/loop] [unique_numbers]I changed a few thing so I could understand the logic better, namely:1) I renamed the variables to something more literal that I could wrap my mind around, and2) I used (The actual space bar) as a delimiter instead of '+' because '+' was confusing me into thinking I was doing math at first and also the display of the final numbers is cleaner with . Seems to work ok for the time being, but if I want to manhandle the [unique_numbers] variable later (with [grep] or whatever) I'll probably have to use a more tangible delimiter...don't really know yet and I'm just rambling..One question: regarding [loop start=1&end=20]: Theoretically, the process could loop 20 times in a row and not generate unique numbers (basically, end=20 could occur before [found]=5) and if this happened then the loop would stop without generating 6 numbers, right? Should I increase this limit to, oh, say 1000 or something to avoid this (unlikely) scenario?Thanks John!-Dan ------------------------------------------- http://www.StrongGraphicDesign.com (208) 319-0137 | Toll-free p/f 877-561-1656------------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list . To unsubscribe, E-mail to: To switch to the DIGEST mode, E-mail to Web Archive of this list is at: http://search.smithmicro.com/ Dan Strong

DOWNLOAD WEBDNA NOW!

Top Articles:

Talk List

The WebDNA community talk-list is the best place to get some help: several hundred extremely proficient programmers with an excellent knowledge of WebDNA and an excellent spirit will deliver all the tips and tricks you can imagine...

Related Readings:

Catch MySQL Connection error (2005) The USArea® Network web site ... (1997) Checking Webdna is running (2007) Quickie question on the email templates (1997) time and welcome (1999) my price won't move (1997) RE: [WebDNA] WebDNA & VPS (2009) using showpage and showcart commands (1996) [WebDNA] Searching for multiple bits of data in one field or use multiple (2016) [LOOKUP] (1997) Images in WebCat (2000) More on the email templates (1997) [REPLACE] inside [FOUNDITEMS] (1998) [listfiles] nested in a [loop] (1998) Newbie search question (between two dates) (2001) Is this possible in simple search? question? (1998) Other then credit cards-how? (1997) Getting store builder store name (2005) E-Mail Preferences in Admin Folder (1997) WebCat2b13MacPlugIn - More limits on [include] (1997)