What is an algorithm? an executable file that has been converted into machine language a set of markup instructions a set of instructions to meet a requirement of some kind programming instructions written in a programming language

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.