Computing PI:

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4 total messages Started by Eric Perkins Tue, 08 Sep 1992 17:44

#478

Author: Eric Perkins
Date: Tue, 08 Sep 1992 17:44

12 lines
892 bytes

There was an article posted a while back asking for an infinite 
PI program. Did anyone have such a program ? The sender said to
reply by mail, but if someone has such a program could they just
post it here?

Also, does someone have a way to verify that PI to x number of 
digits is correct. Lets say I have a file with a sequence of numbers
how can I prove that these are  indeed PI?

-- Eric Perkins
-- perkins@tallis.enet.dec.com

Re: Computing PI:

#498

Author: Wayne Lui
Date: Fri, 11 Sep 1992 03:54

28 lines
1062 bytes

In article <1708@sousa.ltn.dec.com> perkins@sousa.ltn.dec.com (Eric Perkins) 
writes:
>There was an article posted a while back asking for an infinite 
>PI program. Did anyone have such a program ?

Here goes:

	program pi
        implicit double precision (a-h,o-z)
c
        a=1.d0
        b=1.d0/dsqrt(2.d0)
        t=.25d0
        x=1.d0
c
        do 10 i=1,10
         y=a
         a=.5d0*(a+b)
         b=dsqrt(b*y)
         t=t-x*(y-a)*(y-a)
         x=2.d0*x
         p0=p1
         p1=.25d0*(a+b)*(a+b)/t
         write(6,*)i,p1
 10     continue
c
        stop
        end

Re: Computing PI:

#510

Author: Fredric A. Isaman
Date: Sat, 12 Sep 1992 19:27

3 lines
626 bytes

I know some have asked for programs to generate pi.  I was wondering
if anyone knows where I could get a file containing pi out a few thousand
places without having to compute them myself?  Many thanks.

Re: Computing PI:

#527

Author: T.R.Hopkins
Date: Mon, 14 Sep 1992 15:00

11 lines
863 bytes

In article <BuHCqL.AGC@acsu.buffalo.edu> isaman@acsu.buffalo.edu (Fredric A. Isaman) writes:
>I know some have asked for programs to generate pi.  I was wondering
>if anyone knows where I could get a file containing pi out a few thousand
>places without having to compute them myself?  Many thanks.

The first 100000 digits are ftp'able from unix.hensa.ac.uk the required file
is

pub/netlib/pub/misc/pi

Tim

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