Hi Ernest, Thanks for doc reference. I just realized that Java also returns the same numbers.
I will use Wolfgang's tip. Regards. Ernest Friedman-Hill wrote: > > >> (- 1.1 0.9) ==> 0.20000000000000007 >> (- 1.1 0.7) ==> 0.40000000000000013 >> >> Any idea what the reason is or how can I fix it other than to round- >> off in >> the application. > > > This is a general property of the floating-point number system used > in Java (and many other languages); see, for example, http:// > docs.sun.com/source/806-3568/ncg_goldberg.html . The basic idea is > that some numbers which can bre represented exactly in decimal > notation are repeating fractions in binary, and therefore can only be > represented approximately. Unfortunately, this includes multiples of > 0.1 . > > You can use Jess's "format" function for converting a number into a > string in a particular format; i.e., > > (format nil "%.2f" (- 1.1 0.7)) => "0.40" > > > --------------------------------------------------------- > Ernest Friedman-Hill > Informatics & Decision Sciences Phone: (925) 294-2154 > Sandia National Labs FAX: (925) 294-2234 > PO Box 969, MS 9012 [EMAIL PROTECTED] > Livermore, CA 94550 http://www.jessrules.com > > -------------------------------------------------------------------- > To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' > in the BODY of a message to [EMAIL PROTECTED], NOT to the list > (use your own address!) List problems? Notify [EMAIL PROTECTED] > -------------------------------------------------------------------- > > > -- View this message in context: http://www.nabble.com/Floating-issue-tp14690249p14692164.html Sent from the Jess mailing list archive at Nabble.com. -------------------------------------------------------------------- To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED] --------------------------------------------------------------------
