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Re: non zero result after multiplying with zero.

• To: mathgroup at smc.vnet.net
• Subject: [mg36447] Re: non zero result after multiplying with zero.
• From: "David W. Cantrell" <DWCantrell at sigmaxi.org>
• Date: Sat, 7 Sep 2002 02:54:03 -0400 (EDT)
• Organization: NewsReader.Com Subscriber
• References: <al9l3l$b1d$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

rajgupta121 at rediffmail.com (Raj) wrote:
>   When I multiply an expression with 0 it is giving 0.expression which
> is creating problem in the further calculation.

No. Your trouble comes when you multiply an expression by the
floating-point number 0.0, rather than by the precise symbolic 0 (having no
decimal point). Merely make the coefficient 0 (rather than 0.0) and
everything should work as you wish.

David

> 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?

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