Re: how to work with arbitrary precision and accuracy?

[Paul Kienzle]

With octave-forge loaded (http://octave.sf.net)

        octave:1> digits(50)
        ans = 50
        octave:2> Pi
        ans =

        3.141592653589793238462643383279502884197169399375105820975

>From google:


        cad.ucla.edu/repository/useful/PI.txt
        pi = 3, 14159 26535 89793 23846 26433 83279 50288 41971 69399 37510 
58209 74944
        59230 78164 06286 20899 86280 34825 34211 70679 82148 08651 32823 06647 
09384 

Paul Kienzle
address@hidden

On Mon, May 13, 2002 at 10:10:49AM -0400, Mark Esplin wrote:
>       As far as I know, the precision of octave is controlled by the double 
> precision floating point of the c library that octave is linked with?  
> Changing output-precision changes how many digits are printed, but doesn't 
> change the precision of calculations.
> 
>                              -Mark Esplin
> 
> On Monday 13 May 2002 09:21 am, William Kreamer wrote:
> > Octave only has pi and the calculations of its built-in functions
> > programmed to 16 digit accuracy. There is a work-around. You can obtain pi
> > or e to your desired accuracy from a mathematical reference book such as 
> > the CRC Standard Mathematical Tables.
> >
> > To obtain the values of the elementary functions to 32 digit accuracy,
> > Octave can be programmed to calculate the functions from the series. Just
> > be careful not to use arguments that diverge (or converge very slowly) in
> > the series.
> >
> > ----- Original Message -----
> > From: <address@hidden>
> > To: <address@hidden>
> > Sent: Sunday, May 12, 2002 12:36
> > Subject: how to work with arbitrary precision and accuracy?
> >
> > > Hello.
> > > I don't know if octave can do this. My question is about to work with an
> > > arbitrary precission and accuracy with octave.
> > > For example, if I do:
> > > output_precision = 32
> > > and next I do
> > > pi
> > > octave responses:
> > > 3.1415926535897931159979634685442e+00
> > > but this number only has 16 numbers correctly.
> > > What have to do if I work with 32 numbers?
> > >
> > > Thanks in advance,
> > >
> > > Arnau.
> > >
> 
> 
> 
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Octave is freely available under the terms of the GNU GPL.

Octave's home on the web:  http://www.octave.org
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