Mailing List Archive: 49091 messages
  • Home
  • Script library
  • AltME Archive
  • Mailing list
  • Articles Index
  • Site search
 

[REBOL] Re: bit shifts

From: ryanc:iesco-dms at: 20-Sep-2001 10:19

Hallvard Ystad wrote:
> ">> stats rebol > You are not a member of list 'rebol' " > > ... strange, since I didn't unsubscribe... Anyway, I posted something > earlier today, here goes again: > > Gregg Irwin skrev (Tuesday 11.09.2001, kl. 23.31): > >If you're working with numeric values you can multiply or divide, by > >powers > >of two. > >For example (please correct any misinformation REBOLers!): > > > > shl: to-integer (value * (2 ** shift-count)) > > shr: to-integer (value / (2 ** shift-count)) > > Well, this mostly works, but wheras the integer value 1 right-shifted > becomes 0, the same value divided by 2 becomes 0,5. Even if one should > round the value (how do we do so in rebol, by the way?), it would become 1, > not 0. So I think it's better to shift " proprement dire".
Rebol has no rounding function. Here is routine that I have used forever, and it makes a nice rebol one liner. round-off: func [v [number!]][to-integer v + either v > 0 [.5][-.5]]
> > Your other routines seem to work, but only partially, I'm afraid. It seems > rebol has great problems with the debase function... But thanks anyway.
Wow! Your not kidding! It crashes on me bigtime. Has anybody done a feedback?
> ~H > > Praetera censeo Carthaginem esse delendam > > -- > To unsubscribe from this list, please send an email to > [rebol-request--rebol--com] with "unsubscribe" in the > subject, without the quotes.
-- Ryan Cole Programmer Analyst www.iesco-dms.com 707-468-5400