<cfif bitAnd (yourVariable, 2^0) gt 0> ... </cfif> Replace 0 in 2^0 with whatever power you want to test for.
Marius ----- Original Message ----- From: "Richard Meredith-Hardy" <[EMAIL PROTECTED]> To: "CF-Talk" <[EMAIL PROTECTED]> Sent: Thursday, October 21, 2004 11:51 AM Subject: Re: what is it called..? > No relation, I'm afraid! > > Say I have a DB record with lots of attributes. Rather than have loads > of bit columns which each have to be individually evaluated yes/no, I > think you can achieve the same thing by having the single value 22 which > can be evaluated later to mean 2=yes, 4=yes, 8=no, 16=yes, 32=no Etc. > > > > Douglas Knudsen wrote: > > > > but you inherit a geat name in mathematics! Hardy! > > http://www.stetson.edu/~efriedma/periodictable/html/Ho.html > > > > So, what are you trying to do? looks like some sort of partitioning > > looking only at powers of 2.. Can you give another example? > > > > Doug > > > > On Thu, 21 Oct 2004 16:25:57 +0100, Richard Meredith-Hardy > > <[EMAIL PROTECTED]> wrote: > > > ...when you have a value eg 22 which is made up of 2+4+16 so you know of > > > all your options valued 2,4,8,16,32 Etc only 2 and 4 and 16 apply. > > > > > > I know there must be a mathematical name for this, but what? > > > > > > Does anyone have some example CF code to 'decrypt' such numbers? > > > > > > Are there other [simple] ways to do this to handle a large number of > > > options (>25, so I don't start having giant numbers?) Something to do > > > with prime numbers perhaps? > > > > > > You can tell I'm not a mathmatician can't you! > > > > > > THANKS! > > > > > > -- > > > Regards; > > > > > > Richard Meredith-Hardy > > > ------------------------------------------------------------- > > > r[dot]mh[at]flymicro[dot]com > > > Tel: + 44 (0)1462 834776 FAX: + 44 (0)1462 732668 > > > > > > > > > > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Get the mailserver that powers this list at http://www.houseoffusion.com/banners/view.cfm?bannerid=17 Message: http://www.houseoffusion.com/lists.cfm/link=i:4:182205 Archives: http://www.houseoffusion.com/cf_lists/threads.cfm/4 Subscription: http://www.houseoffusion.com/lists.cfm/link=s:4 Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=89.70.4 Donations & Support: http://www.houseoffusion.com/tiny.cfm/54
