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Re: non zero result after multiplying with zero.

• To: mathgroup at smc.vnet.net
• Subject: [mg36432] Re: non zero result after multiplying with zero.
• From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
• Date: Sat, 7 Sep 2002 02:53:38 -0400 (EDT)
• Organization: Universitaet Leipzig
• References: <al9l3l$b1d$1@smc.vnet.net>
• Reply-to: kuska at informatik.uni-leipzig.de
• Sender: owner-wri-mathgroup at wolfram.com

Hi,

Unprotect[Times]
Times[0., __] := 0
Protect[Times]

Regards
  Jens

Raj wrote:
> 
> Hi everybody,
> 
>   When I multiply an expression with 0 it is giving 0.expression which
> is creating problem in the further calculation.
> 
> eg.
> 
> In[1]:=func1[r_]:=Exp[-r/2]
> In[2]:coeff[[1,1]]=0.0;
> ;
> ;
> In[34]:=func1[r]coeff[[1,1]]
> 
> Out[34]:=0.Exp[-r/2]
> 
> I want anything to be multiply by zero must be zero.
> 
>    How can I do that?
> Your suggestion will be highly appreciated.
> 
>    Thanks in advance,
> 
>   Raj