Calculating Pi in Javascript!

[sdfx]

Please help! I found a script that uses the following method to calculate pi:

1/pi = sqrt(8)/9801 * infinite sum 0 to infinity ((4n)!*(1103 + 26390n)/((n!)^4*396^(4n))


Here's the code:

http://uoeinstein.hypermart.net/pi2.htm

I would appreciate it if someone could comment the code (it's not too long) so that I could learn how it works. Thank you for all the help.


-Mike

 

[AndrewGrabovsky]

Hi sdfx!
If you just need PI constant you don't even need to calculate anything:

pi = Math.PI;

Remember - PI should be uppercased!

 

[sdfx]

Yea...that will give you 12 digits. I need to calculate at least 1,000.

 

[tsdragon]

I don't believe that javascript will give you 1000 digits of precision.
Meddle not in the affairs of dragons,
For you are crunchy, and good with mustard.

 

[luciddream]

it will if its a string. luciddream@subdimension.com

 

[tsdragon]

"It will if its a string"???

How do you do calculations with a string?

If you need to calculate pi to 1000 decimal places, how do you do that with a string instead of a number?
Meddle not in the affairs of dragons,
For you are crunchy, and good with mustard.

 

[luciddream]

well, if your only point in calculating PI, is to calculate PI to 1000 digits... you can just append each digit to a string... and the string will hold as many digits as you like. luciddream@subdimension.com

 

[tsdragon]

That's assuming you can calculate each successive digit without exceeding the capacity of of the numbers you are using to do the calculations. I guess you'd have to use some sort of iterative calculations to do this.
Meddle not in the affairs of dragons,
For you are crunchy, and good with mustard.