Write a function madhavapi.m that takes N as input and returns an approximation for pi.

I am trying to write a function that takes N as an input and returns an approximation for pi by using the following equation that Madhava developed. Please help with step by step equation and/or code and/or explanation.

[Azzi Abdelmalek]

Following equation?

[KayLynn]

g series by transforming the original infinite series of π, obtaining the infinite series \pi = \sqrt{12}\left(1-{1\over 3\cdot3}+{1\over5\cdot 3^2}-{1\over7\cdot 3^3}+\cdots\right)

[KayLynn]

its the he original infinite series of π, obtaining the infinite series

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer