Mathematica 9 is now available
Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2003
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2003

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: differences in Solve with -1/2 and -0.5Re:

  • To: mathgroup at smc.vnet.net
  • Subject: [mg44401] Re: [mg44386] differences in Solve with -1/2 and -0.5Re:
  • From: "Kenneth Levasseur" <Kenneth_Levasseur at uml.edu>
  • Date: Sat, 8 Nov 2003 04:50:46 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

I'm using V4.2 on a Mac right now and I'm away from my office, so I 
can't check my V5.  At least one of my students who is using 
Mathematica for Students - V5, got the same "division by zero" 
message.

KL 

----- Original Message -----
From: Andrzej Kozlowski <akoz at mimuw.edu.pl>
To: mathgroup at smc.vnet.net
Subject: [mg44401] Re: [mg44386] differences in Solve with -1/2  and -0.5

> On 7 Nov 2003, at 19:16, Kenneth Levasseur wrote:
> 
> > Can anyone give a good reason why there is a difference in the
> > following?  Preferably one that my students will understand.
> >
> > In[1]:=
> > Solve[D[x E^(-x/2), x] == 0, x]
> > Out[1]=
> > {{x -> 2}}
> > In[2]:=
> > Solve[D[x E^(-0.5*x), x] == 0, x]
> > General::dbyz:Division by zero.
> > Out[2]=
> > {}
> >
> > Ken Levasseur
> > Math. Sciences
> > UMass Lowell
> >
> >
> >
> 
> What version of Mathematica? In 5.0 I get:
> 
> In[4]:=
> Solve[D[x E^(-x/2), x] == 0, x]
> 
> Out[4]=
> {{x->2}}
> 
> In[5]:=
> Solve[D[x E^(-0.5*x), x] == 0, x]
> 
> Out[5]=
> {{x->2.}}
> 
> 
> 
> 
> Andrzej Kozlowski
> Yokohama, Japan
> http://www.mimuw.edu.pl/~akoz/
> 
> 
> 
> E1-I: This message has been scanned for viruses and 
dangerous 
> content by UML's antivirus scanning services.
> 
> 
> 
> 


  • Prev by Date: Re: FourierTransform of Sinc Function
  • Next by Date: Re: Fluid dynamics
  • Previous by thread: Re: Putting NonLinear fit into a For[ ] Loop
  • Next by thread: Re: differences in Solve with -1/2 and -0.5Re: