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RE: Number of digits

• To: mathgroup at smc.vnet.net
• Subject: [mg73942] RE: Number of digits
• From: Robert Pigeon <robert.pigeon at videotron.ca>
• Date: Sat, 3 Mar 2007 01:14:03 -0500 (EST)
• Reply-to: robert.pigeon at videotron.ca

Many thanks !!! Exactly what I was looking for.

Merci !

Robert

Robert Pigeon
TZ = -5



-----Message d'origine-----
De : Jean-Marc Gulliet [mailto:jeanmarc.gulliet at gmail.com]
Envoy=C3=A9 : Friday, March 02, 2007 07:55
=C3=80 : robert.pigeon at videotron.ca; mathgroup at smc.vnet.net
Objet : Re: Number of digits


Robert Pigeon wrote:
> Good afternoon,
> 	How can I force Mathematica to output an answer with a certain number 
of
> significant digits ? What I mean is I want the answer of, let say, 1.0 
/ 3
> to be output in Mathematica as 0.33 for example. The reason I want to 
do
> that is that I am making a table (using TableForm) of a list of 
answers to
> use in a report. I do not want to see 0.33333 in the table just 0.33 !
> 	I could use SetPrecision[1./3, 2], but I do not want to do that for 
every
> calculation. I have looked at $MachinePrecision and all other $.... , 
but I
> cannot make sense out of it.
> 	So what I am trying to do, in a nut shell, is do what can be done 
with a
> pocket calculator, set my "visible" answer with a certain number of 
digits!
>
> Thanks,
>
> Robert
>
> Robert Pigeon
> TZ = -5
>
>
>

Use NumberForm to control the display of numbers.

In[1]:=
NumberForm[x, {3, 2}, NumberPadding -> {"", "0"}] /.
   x -> 0.123456

Out[1]//NumberForm=
0.12

If you want this by default (rather that 6 decimal digits), you can set
the $Post variable as in

In[2]:=
$Post = NumberForm[#1, {3, 2}, NumberPadding -> {"", "0"}] &

Out[2]//NumberForm=
Slot[1.00]&

In[3]:=
12.1234

Out[3]//NumberForm=
12.10

Regards,
Jean-Marc