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Re: could someone explain Mathematica's protests about division by zero here?

• To: mathgroup at smc.vnet.net
• Subject: [mg69686] Re: could someone explain Mathematica's protests about division by zero here?
• From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>
• Date: Thu, 21 Sep 2006 07:29:00 -0400 (EDT)
• Organization: Uni Leipzig
• References: <eeqqvi$ot7$1@smc.vnet.net>

Hi,

do you think it is a good idea to use the symbol N
?? Remember that N[expr] convert everything to 
floating
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,
1.75*
n*(1 - Sqrt[1 + (0.16*(-0.5*m*X + X^2))/m^2])]]

work fine.

Regards
  Jens

"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[
| 
1+(0.1600000000000000944`3.096910013008058*(-0.5`2.\
| 3979400086720393*m*X+X^2))/m^2])]]
|
| -- 
| http://chris.chiasson.name/
| 

• Follow-Ups:
  • Re: Re: could someone explain Mathematica's protests about division by zero here?
    • From: "Chris Chiasson" <chris@chiasson.name>