You want to plug a keyboard into the back of a computer. you know that you need to plug the keyboard cable into a ps/2 port. which style of port is the ps/2?

Least square fit to polynomial write a function leastsquarefit3pol that solves a linear system of equations to find a least squares fit of a third order polynomial to an experimental data set given as two row arrays. the function leastsquarefit3pol must explicitly solve a set of linear equations and cannot use polyfit. there should be no restriction on the size of the problem that can be solved.