Re: strange bug?
- To: mathgroup at smc.vnet.net
- Subject: [mg79185] Re: strange bug?
- From: Steven Siew <siewsk at bp.com>
- Date: Fri, 20 Jul 2007 03:33:03 -0400 (EDT)
- References: <f7n4k9$24e$1@smc.vnet.net>
On Jul 19, 5:42 pm, "Jeremy Price" <cfga... at u.washington.edu> wrote: > I think I've found a bug in mathematica 5.2, > > In[418]:= > $Version > > Out[418]= > 5.2 for Microsoft Windows (June 20, 2005) > > When I run, eg, > > In[416]:= IntegerPart[10*5.1] > > Out[416]= 51 > > I get what I expect. But when I run the same thing in a loop, > > For[n = 1, n < 20, n = n + .1, > Print[n, " ", IntegerPart[10*n]] > ] > > I get output like: > > >From In[415]:= 4.2 42 > >From In[415]:=4.3 43 > >From In[415]:=4.4 44 > >From In[415]:=4.5 45 > >From In[415]:=4.6 46 > >From In[415]:=4.7 47 > >From In[415]:=4.8 48 > >From In[415]:=4.9 48 > >From In[415]:=5. 49 > >From In[415]:=5.1 50 > >From In[415]:=5.2 51 > > Any idea what's going on here or how to fix it? You can see the problem for yourself with this a = .1 b = a * 10^30 c = b - 10^(30-1) You would see that c is not zero as you would naively had expected