Re: Non-repeating Random Numbers
This WebDNA talk-list message is from 2002
It keeps the original formatting.
numero = 43036
interpreted = N
texte = Dan Strong wrote: > Generate 6 random numbers between 1 and 54: > > How do I simply and elegantly ensure that all six numbers are different? > By simply and elegantly I mean without resorting to any temp .dbs or > anything like that. >
That's not random, though. A true random number sequence can contain a very large run of identical values. What I think you want is to chose 6 unique values from between 1 and 54. Why don't you store the result in a text variable and check to see if the value you are looking for is already there? Remember to use a delimeter around each value so you don't match substrings. Something like this (NOT TESTED):[text]numbers=+[text] [math]found=0[/math] [loop start=1&end=20] [text]number=[math]ceil([RANDOM format=float]*(54))[/math][/text] [showif [numbers]!+[number]+] [text]numbers=[numbers]+[number]+[/text] [math]found=[found]+1[/math] [/showif] [showif [found]=6][break][/showif] [/loop]then your [numbers] text variable contains all 6 unique values. Be aware that PRND's for most computers are really lousy.John-- John Peacock Director of Information Research and Technology Rowman & Littlefield Publishing Group 4720 Boston Way Lanham, MD 20706 301-459-3366 x.5010 fax 301-429-5747 ------------------------------------------------------------- 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 Strong wrote: > Generate 6 random numbers between 1 and 54: > > How do I simply and elegantly ensure that all six numbers are different? > By simply and elegantly I mean without resorting to any temp .dbs or > anything like that. > That's not random, though. A true random number sequence can contain a very large run of identical values. What I think you want is to chose 6 unique values from between 1 and 54. Why don't you store the result in a text variable and check to see if the value you are looking for is already there? Remember to use a delimeter around each value so you don't match substrings. Something like this (NOT TESTED):[text]numbers=+[text] [math]found=0[/math] [loop start=1&end=20] [text]number=[math]ceil([RANDOM format=float]*(54))[/math][/text] [showif [numbers]!+[number]+] [text]numbers=[numbers]+[number]+[/text] [math]found=[found]+1[/math] [/showif] [showif [found]=6][break][/showif] [/loop]then your [numbers] text variable contains all 6 unique values. Be aware that PRND's for most computers are really lousy.John-- John Peacock Director of Information Research and Technology Rowman & Littlefield Publishing Group 4720 Boston Way Lanham, MD 20706 301-459-3366 x.5010 fax 301-429-5747 ------------------------------------------------------------- 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/
John Peacock
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:
Signal Raised (1997)
ADMIN ACCESS (1999)
Anyone using [sendmail] for HTML encoded mail? (2000)
NT 2.1b10 (1998)
Sku numbers (1997)
Multiple fields on 1 input (1997)
Serving images from databases (1998)
image attachments using [sendmail] - does it require v4.5? (2002)
taxrate - off by 1 cent (1997)
WebTV (1998)
limitation found on group searching (1997)
Comments in db? (1997)
[WebDNA] New list (2008)
PCS Emailer's role ? (1997)
AppleScript question (1997)
WebCatalog Technical Reference (1997)
experts! - [foundItems] context problem (2000)
JS Help (2004)
[object] Tag & WebDNA Support (2005)
Resume Catalog ? (1997)