Berkeley CSUA MOTD:Entry 23479
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2025/05/25 [General] UID:1000 Activity:popular
5/25    

2002/1/7-8 [Science/Space, Computer/HW/CPU] UID:23479 Activity:low
1/7     In the spirit of the post below regarding 0.1 (IEEE floating point
        representation), how do I find out what the rounding rule is for
        a particular processor, and what DBL_EPSILON is? Would this pose a
        big problem for scientific applications (e.g. Mars Rover, satellite,
        atomic energy simulations, etc)?
        \_ DBL_EPSILON is defined in /usr/include/float.h.  I don't know if
           the value is only for C running on that processor or if it's good
           for any language running on that processor.
        \_ Go talk to Kahan.  Be prepared to be insulted for your stupidity.
           But hey, it's a small price to pay.
           \_ Apparently, Kahan can be neutralized if you talk to him in
              the Right Way.  For instance, a friend of mine would go ask
              him a small question about linear algebra, then he just sits
              back for the next hour and listen about linear algebra fairy
              tales with dragons of perturbation, maidens of symmetric
              forms, and knights of floating points.  He highly recommends
              it to anybody.  Unfortunately I think this Right Way involves
              being humble and perceptive, hence unsuitable for most of this
                    \_ Precisely. And I highly recommend the experience if
                       you have time to kill (having tried it
                       first-hand). -alexf
                                    \- prepare to be quizzed. also Kahan's
                                    insults/derision is pretty funny. it's
                                    always "sincere" rather than "mean-
                                    spirited" if you know what i mean.
                                        --partha "meromorphic" banerjee
              audience.  Too bad.
2025/05/25 [General] UID:1000 Activity:popular
5/25    

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