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yurenchu

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yurenchu received Quiz Master badge for Solution 10629015

on 7 Mar 2023

yurenchu submitted a Comment to Solution 1307481

Thanks for the link, David Verrelli. I seem to remember that the "Delete" button did work in the not-too-distant-past (a few months ago), but maybe I'm misremembering things. However, to be honest, I don't mind this bug as much because I think it's a good thing that a comment can't be deleted when it has already received replies; otherwise a thread of comments would become unreadable. It's only when an erroneous comment of mine hasn't received any replies yet and the "Delete" button turns out to be non-functional that I experience a slight "Aaargghh!" moment, because the presence of the "Delete" button created different expectations. :-) But I don't really mind leaving my erroneous comment up and correcting myself in a new comment, as I did above.

on 19 Nov 2017

yurenchu submitted a Comment to Problem 44364. Is this a valid Tic Tac Toe State?

@Jean-Marie Sainthillier: If we'd number the nine cells of the grid as [1,4,7; 2,5,8; 3,6,9], then a series of moves that would lead to x = [1,-1,-1; 0,1,-1; 1,0,1] without "insensible" moves for X (the commencing party) would be: X:5, O:7, X:3, O:8, X:9, O:4, X:1 ; in that case, X did not miss a win nor continue to play after a win.

on 19 Nov 2017

yurenchu submitted a Comment to Problem 44403. Goldbach's marginal conjecture - Write integer as sum of three primes

Hi David Verelli. Thanks a lot for your comments regarding my first created problem, I really appreciate it. Sorry for not replying any sooner, but my computer broke down a few days ago. Thanks for discovering the flaws and errors in the test suite. A few of the tests were indeed missing valid solution triplets, I've fixed them now. I've also fixed the spelling error in test #9 and a problem with the random integer selection. Your solution should pass now (I don't know how long rescoring will take)! Again, thanks a lot for your feedback, much appreciated!

on 18 Nov 2017

yurenchu submitted a Comment to Solution 1138264

Sorry, there's a small error in my previous comment: I wrote "until the sixth (= last) time", but that should be "until the seventh (= last) time".

on 13 Nov 2017

yurenchu submitted a Comment to Solution 1138264

@David Verelli: I've just looked into it and finally figured out why it works. According to the main description on the documentation pages, the function 'if Z' (and also 'while Z') proceeds into the conditional block when expression Z is "nonempty and contains only nonzero elements (logical or real numeric)". In other words, it doesn't consider only the first element, it actually considers all elements of Z; and when Z contains a zero, the if-block is exited/ignored. The reason why it works here in the case of test #6, is that the input matrix x = magic(10) is distributed "evenly enough" across the columns, so that every column contains at least one element greater than 63, and hence the row vector max(x) doesn't contain a 0 until the sixth (= last) time that the elements of x are reduced by the "fix(x/2)" step. So it works in this specific case, but to make this solution work generally for every case where x is a matrix, the line must be changed into "if max(x(:)),".

on 13 Nov 2017

yurenchu submitted a Comment to Solution 1328026

Thanks, Peng Liu! I would have expected that [] as an index of a cell variable would lead to an error, but apparently MATLAB accepts it and produces a comma-separated list of zero terms (which I now realize is apparently different from an empty matrix, otherwise it would have assigned "ans = [];"). Anyway, again, thanks for your comments, it really helped me understanding MATLAB better!

on 12 Nov 2017

yurenchu liked Solution 579855

on 12 Nov 2017

yurenchu received Sequences & Series III Master badge

on 12 Nov 2017
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