Re: Non-repeating Random Numbers - CORRECTION
This WebDNA talk-list message is from 2002
It keeps the original formatting.
numero = 43067
interpreted = N
texte = Dan -There's one important item you removed from John's proposal, and it will cause poor random number distribution if you don't fix it...You need to include delimiters surrounding each number you stick into your unique_numbers text variable, and include those delimiters in your contains test. The way your code is written below, the numbers 1 and 4 will be rejected if the number 41 has already been chosen, because 41 contains 1 and 4. Statistically, you will have a significant shortage of 1-digit numbers.Your code uses a space as a delimiter, which is fine, but you need to initialize unique_numbers with a leading space. John used + as his delimiter, my preference is usually to use _ or |, but it's really up to you.Simply, to fix this problem in your code and continue using the space delimiter, I would change two lines:[text show=f]unique_numbers= [/text] ^ note the space characterand[hideif [unique_numbers]^ [random_number] ] ^ ^ note the space characters- brian At 3:57 PM 9/1/02, Dan Strong wrote: >Andrew, > >I don't really want to search a .db that's why I went the route I >did...but I'm sure your code works fine... > >Seems I spoke too soon..previous code was showing duplicate #s >(read: not working as intended) so I altered the code slightly from >before, and it appears to work. For anyone who's interested here is >working code (Andrew (and any 'grown-ups')can ignore this... ;) > >[!] -- Randomly 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] >[hideif [unique_numbers]^[random_number]] >[text show=f]unique_numbers=[unique_numbers][random_number] [/text] >[math show=f]found=[found]+1[/math] >[/hideif] >[showif [found]=6][break][/showif] >[/loop] >[unique_numbers] > >-Dan >------------------------------------------- >http://www.StrongGraphicDesign.com >(208) 319-0137 | Toll-free p/f 877-561-1656 > > > >On Mon, 2 Sep 2002 11:08:32 > Andrew Simpson
wrote: >>whats wrong with : >> >>[search >>db=/db/54numbersfrom1-54.db&neNUMBERdatarq=[BLANK]&raNUMBERsort=1&NUMBERtype >>=NUM&max=6] >> [founditems][number]
[/founditems] >>[/search] >> >> >>----- Original Message ----- >>From: Dan Strong >>To: WebCatalog Talk >>Sent: Monday, September 02, 2002 10:46 AM >>Subject: Re: Non-repeating Random Numbers - CORRECTION >> >>>whoops... >>>[showif [found]=5][break][/showif] >>>should say 6, not 5... corrected code below: >>> >>>[!] --- 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]=6][break][/showif] >>>[/loop] >>>[unique_numbers] >>> >>>-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/ >> >> >>------------------------------------------------------------- >>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/ > > >------------------------------------------------------------- >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/ ------------------------------------------------------------- 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:
Dan -There's one important item you removed from John's proposal, and it will cause poor random number distribution if you don't fix it...You need to include delimiters surrounding each number you stick into your unique_numbers text variable, and include those delimiters in your contains test. The way your code is written below, the numbers 1 and 4 will be rejected if the number 41 has already been chosen, because 41 contains 1 and 4. Statistically, you will have a significant shortage of 1-digit numbers.Your code uses a space as a delimiter, which is fine, but you need to initialize unique_numbers with a leading space. John used + as his delimiter, my preference is usually to use _ or |, but it's really up to you.Simply, to fix this problem in your code and continue using the space delimiter, I would change two lines:[text show=f]unique_numbers= [/text] ^ note the space characterand[hideif [unique_numbers]^ [random_number] ] ^ ^ note the space characters- brian At 3:57 PM 9/1/02, Dan Strong wrote: >Andrew, > >I don't really want to search a .db that's why I went the route I >did...but I'm sure your code works fine... > >Seems I spoke too soon..previous code was showing duplicate #s >(read: not working as intended) so I altered the code slightly from >before, and it appears to work. For anyone who's interested here is >working code (Andrew (and any 'grown-ups')can ignore this... ;) > >[!] -- Randomly 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] >[hideif [unique_numbers]^[random_number]] >[text show=f]unique_numbers=[unique_numbers][random_number] [/text] >[math show=f]found=[found]+1[/math] >[/hideif] >[showif [found]=6][break][/showif] >[/loop] >[unique_numbers] > >-Dan >------------------------------------------- >http://www.StrongGraphicDesign.com >(208) 319-0137 | Toll-free p/f 877-561-1656 > > > >On Mon, 2 Sep 2002 11:08:32 > Andrew Simpson wrote: >>whats wrong with : >> >>[search >>db=/db/54numbersfrom1-54.db&neNUMBERdatarq=[BLANK]&raNUMBERsort=1&NUMBERtype >>=NUM&max=6] >> [founditems][number]
[/founditems] >>[/search] >> >> >>----- Original Message ----- >>From: Dan Strong >>To: WebCatalog Talk >>Sent: Monday, September 02, 2002 10:46 AM >>Subject: Re: Non-repeating Random Numbers - CORRECTION >> >>>whoops... >>>[showif [found]=5][break][/showif] >>>should say 6, not 5... corrected code below: >>> >>>[!] --- 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]=6][break][/showif] >>>[/loop] >>>[unique_numbers] >>> >>>-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/ >> >> >>------------------------------------------------------------- >>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/ > > >------------------------------------------------------------- >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/ ------------------------------------------------------------- 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/
Brian Fries
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