Chris Taylor
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 Dec 17 awarded Yearling Dec 6 revised Computational complexity of least square regression operation added 518 characters in body Dec 3 awarded Favorite Question Dec 3 awarded Nice Question Nov 26 awarded Enlightened Nov 26 awarded Nice Answer Oct 30 awarded Good Answer Oct 20 awarded Nice Answer Oct 4 revised Choice Problem: choose 5 days in a month, consecutive days are forbidden added 17 characters in body Oct 4 comment Choice Problem: choose 5 days in a month, consecutive days are forbidden Thanks, edited :) Oct 4 answered Choice Problem: choose 5 days in a month, consecutive days are forbidden Oct 1 awarded Good Question Sep 30 awarded Explainer Sep 28 revised How do you integrate imaginary numbers? added 15 characters in body Sep 26 comment Consider the problem minimize $f(x)= x^4 −1.$ The proof of quadratic convergence for Newton's method uses the fact that the first derivative of the function whose zero you are finding (i.e. $f''(x)$ in your case) does not vanish on some interval surrounding the root. But you have $f''(x) = 12x^2$ which is zero at the root $x=0$, so the proof of quadratic convergence fails. Sep 26 comment Solve linear system with matlab Also, your text specifies $m\geq n$ but your example has $m < n$ (although I don't think this is relevant - probably just a typo). Sep 26 comment Solve linear system with matlab You have more equations than unknowns; why do you expect to be able to find an exact solution? Sep 11 comment Pseudo Proofs that are intuitively reasonable @MJD Yes, good to mention the Andreas Blass paper too. I'm not sure whether I knew about it or not when I wrote this answer. If I did, then it was surely an oversight. Sep 11 awarded Nice Answer Sep 10 awarded Nice Answer