Services & Resources / Wolfram Forums / MathGroup Archive

MathGroup Archive 2010

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Precision of calculations

  • To: mathgroup at
  • Subject: [mg109462] Re: Precision of calculations
  • From: Bill Rowe <readnews at>
  • Date: Wed, 28 Apr 2010 01:59:23 -0400 (EDT)

On 4/27/10 at 4:04 AM, lambaugh at (Jim Lambaugh) wrote:

>When I write numbers in my code, I do it as (e.g.)

>1.0 1000.0 Pi //N etc...

>Is it correct to say that my calculations are done with machine-
>precision, i.e. with rougly 16 digit precision?

Yes. But note, you do not explicitly need to convert exact
numbers to machine numbers using N in most cases. For example
1000. Pi computes a machine precision number without explicitly
using N. The default for Mathematica is to use machine precision
if any portion of an expression is in machine precision and the
precision of other portions is not explicitly given.

  • Prev by Date: exporting graphics as PDF
  • Next by Date: Re: Precision of calculations
  • Previous by thread: Re: Precision of calculations
  • Next by thread: Re: Precision of calculations