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precision of pi [message #6457]

Wed, 03 July 1996 00:00

Jorn Helbert
Messages: 4
Registered: July 1996

Junior Member

Hi,
a simple question:
Is there any way to enhance the precision of !pi or !dpi. 5 or 8
significant digits are really not much.

cheers
jorn

--
Joern Helbert

Space and atmospheric physics group
Imperial College - London
phone: 0171 594-7898

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Re: precision of pi [message #6550 is a reply to message #6457]

Wed, 03 July 1996 00:00

dan
Messages: 27
Registered: March 1993

Junior Member

In article <31DA5CAA.3D0D@ic.ac.uk>, Jorn Helbert <jorn@ic.ac.uk> writes:
|> Hi,
|> a simple question:
|> Is there any way to enhance the precision of !pi or !dpi. 5 or 8
|> significant digits are really not much.
|>
|> cheers
|> jorn
|>
|> --
|> Joern Helbert
|>
|> Space and atmospheric physics group
|> Imperial College - London
|> phone: 0171 594-7898

I type

IDL> print,!dpi,format='(f50.40)'
3.1415926535897931159979634685441851615906

Looks to me as though you've got 16 good digits.
--
************************************************************ ***
** Dan Bergmann dbergmann@llnl.gov **
** Atmospheric Science Division fax (510) 422-5844 **
** Lawrence Livermore National Lab human (510) 423-6765 **

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Re: precision of pi [message #6566 is a reply to message #6457]

Fri, 12 July 1996 00:00

djackson
Messages: 31
Registered: June 1993

Member

In article <31DA5CAA.3D0D@ic.ac.uk>, Jorn Helbert <jorn@ic.ac.uk> wrote:

> Hi,
> a simple question:
> Is there any way to enhance the precision of !pi or !dpi. 5 or 8
> significant digits are really not much.

I think the precision is there, but these examples will show how to display it:

IDL> print,!dpi
3.1415927

IDL> print,!dpi,format="(F20.18)"
3.141592653589793100

Cheers,
-Dick

Dick Jackson djackson@ibd.nrc.ca Institute for Biodiagnostics
Opinions are mine alone. National Research Council Canada, Winnipeg
"And I told him my dream was to live for all time
In some perfect refrain, like the man who wrote 'Danny Boy'."
- Joe Jackson, from the album _Night_Music_, 1994.

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