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RE: non zero result after multiplying with zero.


>-----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[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
>

Raj,

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

func1[-Infinity]coeff[[1, 1]]
>From In[90]:=
Infinity::"indet": "Indeterminate expression 0. Infinity encountered."
Out[90]= Indeterminate

--
Hartmut Wolf



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