so far I have this

I keep running in to the problem that my y value is incorrect

It is well known that 4=arctan(1) Use the Taylor series for the arctan at the origin to write 4 as a series. Write a function that returns the error when 4 is evaluated truncating the series after n terms. For the exact value of use the builtin matlab variable pi. function y= pi4Error (n) \[ \begin{array}{l}\text { pi_real }=0 ; \\ \text { for } i=0: n \\ \text { pi_real }=\text { pi_real }+(-1)^{\wedge} i /(2 * i+1) \text {; } \\ \text { end } \\ \text { pi_real = pi_real } * 4 \\ y=\text { abs(pi_real-pi) }\end{array} \]