Calculate pi decimals

Calculate pi decimals with Machin's formula pi = 16*acot(5) - 4*acot(239)

Description

MACHIN0 is the original and handsome code.

MACHIN is a faster version (at least a factor pi) but a less readable code. MACHIN gives you 100000 digits in a minute.

MACHIN is correct at least up to 10 million digits (~ 3 days). If you try 100 million digits you will get the wrong answer after one year.

Do you need more digits faster? Try
http://numbers.computation.free.fr/Constants/PiProgram/pifast.html

• MATLAB release: MATLAB 7.11 (2010b)

[John D'Errico]

A nice code. Well written. Simple, descriptive help. And its surprisingly fast, generating 4000 digits of pi in under a second on my slow CPU. I picked some random digits to verify, all were correct. Well done.

[Thomas]