Re: Re: could someone explain Mathematica's protests about division by zero here?
- To: mathgroup at smc.vnet.net
- Subject: [mg69743] Re: [mg69686] Re: could someone explain Mathematica's protests about division by zero here?
- From: "Chris Chiasson" <chris at chiasson.name>
- Date: Fri, 22 Sep 2006 01:04:11 -0400 (EDT)
- References: <firstname.lastname@example.org> <200609211129.HAA07605@smc.vnet.net>
N got in there because I had a rule: MakeBoxes[Newton,_]="N"
When I cut and pasted the code, it interpreted the box structures to
contain the symbol N. However, the behavior was exactly the same, so I
didn't bother to change it to something more innocuous.
I guess I was expecting some kind of error like: "too little
precision, you numskull" and not, "division by zero".
On 9/21/06, Jens-Peer Kuska <kuska at informatik.uni-leipzig.de> wrote:
> do you think it is a good idea to use the symbol N
> ?? Remember that N[expr] convert everything to
> point numbers.
> What do you expect when you combine numbers with
> 1.8 digits precision ?? and -1/2 with 2,3 digits
> Assuming[n > 0,
> Refine at Min[829046.769691507*n,
> n*(1 - Sqrt[1 + (0.16*(-0.5*m*X + X^2))/m^2])]]
> work fine.
> "Chris Chiasson" <chris at chiasson.name> schrieb im
> Newsbeitrag news:eeqqvi$ot7$1 at smc.vnet.net...
> | Assuming[N>0,
> Refine at Min[829046.769691507`1.8176125240919663*N,
> | 1.75`1.7378880703663873*^8*
> | N*(1-Sqrt[
> | 3979400086720393*m*X+X^2))/m^2])]]
> | --
> | http://chris.chiasson.name/
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