i was also reading that article. but in that article, all the examples given involves multiplication and divisions and exponents. this has been noted before.
the bug have the same root cause, but none has given a simple addition and subtraction case example yet. it is just 4 numbers and 3 decimal places. the example test case is actual data from our ida application. fortunately, the 12th decimal place is not significant. but imagine the problem occurring in astrophysics or quantum mechanics, dealing with pie and prime numbers ! i wonder how is it handled in nuclear research and atomic super colliders ? small error - but wham ! bang ! good bye world ! http://software.krimnet.com/cpu-precision-bug-plus-minus-operation.htm On Sun, Sep 5, 2010 at 10:11 AM, Walter Heck - OlinData.com < [email protected]> wrote: > This is floating point rounding causing you hassles. Read this for > more info: http://docs.sun.com/source/806-3568/ncg_goldberg.html (that > gest very technical though :) ) > > On Sun, Sep 5, 2010 at 10:01, Raja Iskandar Shah > <[email protected]> wrote: > > guys, need some help testing this out > > > > taufiq has detected a bug involving a plus minus operations that should > > result in zero but does not ! > > > > try the following in openoffice calc, ms excel, javascript, google calc > > > > =161001.165-100000.009-60000.7-1000.456 // will not return zero > > > > =161001.165+(-100000.009-60000.7-1000.456) // this does > > > > =((161001.165-100000.009)-60000.7)-1000.456 // and this not > > > > read the test case : > > > http://software.krimnet.com/cpu-precision-bug-plus-minus-operation.htm#comment-491 > > > > so far we have tested on intel atom, intel core2, intel xeon > > > > need to see if the same problem happens on amd cpu > > > > > > -- > > Join Open Source Developers Club Malaysia http://www.osdc.my/ > > > > Facebook Fan page > > > > http://www.facebook.com/group.php?gid=98685301577 > > > > http://www.facebook.com/OSDC.my > > > > You received this message because you are subscribed to the Google > > > > Groups "OSDC.my Mailing List" group. > > To post to this group, send email to [email protected] > > To unsubscribe from this group, send email to > > [email protected]<osdcmy-list%[email protected]> > > For more options, visit this group at > > http://groups.google.com/group/osdcmy-list?hl=en > > > > -- > Walter Heck > Founder @ OlinData (http://olindata.com) > > -- > Join Open Source Developers Club Malaysia http://www.osdc.my/ > > Facebook Fan page > > http://www.facebook.com/group.php?gid=98685301577 > > http://www.facebook.com/OSDC.my > > You received this message because you are subscribed to the Google > > Groups "OSDC.my Mailing List" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected]<osdcmy-list%[email protected]> > For more options, visit this group at > http://groups.google.com/group/osdcmy-list?hl=en -- Join Open Source Developers Club Malaysia http://www.osdc.my/ Facebook Fan page http://www.facebook.com/group.php?gid=98685301577 http://www.facebook.com/OSDC.my You received this message because you are subscribed to the Google Groups "OSDC.my Mailing List" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/osdcmy-list?hl=en
