Re: using N function
- To: mathgroup at smc.vnet.net
- Subject: [mg76395] Re: using N function
- From: Szabolcs <szhorvat at gmail.com>
- Date: Mon, 21 May 2007 06:02:23 -0400 (EDT)
- Organization: University of Bergen
- References: <f2me6h$lu4$1@smc.vnet.net> <f2orbi$6vd$1@smc.vnet.net>
The OP probably uses Thunderbird, and he copied and pasted the expressions from his first message. Thunderbird has the stupid habit to display the 2 in x^2 as a superscript. When you copy it, it will be copied as x2, not x^2 (and unfortunately nobody cares to fix this bug). So 640320^3 got turned into 6403203. Pay attention to this if you use Thunderbird and you are copying Mathematica code from e-mail messages ... it bit me more than once. Szabolcs Jens-Peer Kuska wrote: > Hi, > > Mathematica 5.2 and 6.0 say > > 2.625374126343655*10^17 > > and so I don't know what you mean .. > > Regards > Jens > > kkwweett wrote: >> Good morning Mathematica users, >> >> >> Can anyone tell me, please, which of a),b) or c) is wrong : >> >> a) >> <MathematicaHelp> >> <quote> >> >> N[expr] is equivalent to N[expr, MachinePrecision]. >> >> </quote> >> </MathematicaHelp> >> >> b) >> In[1]:=N[Exp[Sqrt[163 ]Pi] - 6403203] >> Out[1]=256. >> >> >> c) >> In[2]:=N[Exp[Sqrt[163 ]Pi] - 6403203,$MachinePrecision] >> Out[2]=743.9999999999993 >> >> ? >> >> Thank you >> >
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