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:
Where's Cart Created ? (1997)
Post size Limit? (1998)
OT: Just for a waste of time (2003)
change the number format (1997)
Sort Order on a page search (1997)
[OT] (waaaay OT) my photo (2004)
FYI-WebCat Mac or NT (1997)
WebCatalog for Dummies p.1 (2000)
A few questions about server configuration (2000)
Banners (1997)
reversing the effects of [url] (1997)
Error Lob.db records error message not name (1997)
counting characters and/or words (1997)
Add a field to the error log? (1997)
Just Testing (1997)
Now you see it now you donīt (1997)
Searchable Archives? (2000)
PSC recommends what date format yr 2000??? (1997)
Applying discounts as more items are added... (1997)
View order not right (1997)