Re: Preserve natural number "e" using N or SetPrecision
- To: mathgroup at smc.vnet.net
- Subject: [mg30855] Re: [mg30781] Preserve natural number "e" using N or SetPrecision
- From: BobHanlon at aol.com
- Date: Thu, 20 Sep 2001 03:52:05 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
In a message dated 2001/9/19 12:45:20 AM, guillerm at aida.usal.es writes:
>When it is used N or SetPrecision in expresions involving the natural
>number "e" Mathematica gives the output showing "e" as a numeric value
>i.e:
>
>int[]:=N[0.19884 Exp[-2.0000000037 t], 5]
>
>out[]:=0.19884 2.71828^(-2. t)
>
>or
>
>int[]:=SetPrecision[0.19884 Exp[-2.0000000037 t],3]
>
>out[]:=0.199 2.72^(-2. t)
>
>But I wish see in the output the simbolic notation of "e" better than
>the numeric value. Any help?
>
0.19884 Exp[-2.0000000037 t] /.
x_?NumberQ :> N[x, 5]
0.19884 Exp[-2.0000000037 t] /.
x_?NumberQ :> SetPrecision[x, 3]
Bob Hanlon
Chantilly, VA USA