       RE: non zero result after multiplying with zero.

• To: mathgroup at smc.vnet.net
• Subject: [mg36442] RE: [mg36420] non zero result after multiplying with zero.
• From: "Wolf, Hartmut" <Hartmut.Wolf at t-systems.com>
• Date: Sat, 7 Sep 2002 02:53:53 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

```>-----Original Message-----
>From: rajgupta121 at rediffmail.com [mailto:rajgupta121 at rediffmail.com]
To: mathgroup at smc.vnet.net
>Sent: Friday, September 06, 2002 9:17 AM
>Subject: [mg36442] [mg36420] non zero result after multiplying with zero.
>
>
>Hi everybody,
>
>  When I multiply an expression with 0 it is giving 0.expression which
>is creating problem in the further calculation.
>
>eg.
>
>In:=func1[r_]:=Exp[-r/2]
>In:coeff[[1,1]]=0.0;
>;
>;
>In:=func1[r]coeff[[1,1]]
>
>Out:=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.
>
>
>  Raj
>

Raj,

this simply is, because 0. Exp[-r/2] is not always zero!

func1[-Infinity]coeff[[1, 1]]
>From In:=
Infinity::"indet": "Indeterminate expression 0. Infinity encountered."
Out= Indeterminate

--
Hartmut Wolf

```

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