Cody

William

3
Rank
70
Badges
35835
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1 – 50 of 3,613

William submitted Solution 2108728 to Problem 45280. La derivada numérica

15 hours and 26 minutes ago

William submitted Solution 2106431 to Problem 45277. Orthogonal Circles

on 26 Jan 2020 at 19:34

William submitted Solution 2106345 to Problem 45278. Orthogonal lines

on 26 Jan 2020 at 16:36

William submitted Solution 2106342 to Problem 45276. No of squares in a grid

on 26 Jan 2020 at 16:28

William submitted Solution 2106338 to Problem 45276. No of squares in a grid

on 26 Jan 2020 at 16:27

William submitted Solution 2106340 to Problem 45276. No of squares in a grid

on 26 Jan 2020 at 16:26

William submitted a Comment to Problem 45275. Solve Sudoku puzzle step by

Hello BinBin, This is a good problem! But I am wondering: In the test suite, shouldn't the statement "tt = mat2cell(s,[3,3,3],[3,3,3]);" be inside the for-loop?

on 25 Jan 2020 at 14:18

William submitted Solution 2097749 to Problem 45270. Game of life - 02

on 18 Jan 2020 at 23:08

William submitted Solution 2097655 to Problem 45269. Game of life - 01

on 18 Jan 2020 at 21:28

William submitted Solution 2094947 to Problem 45267. Zero

on 16 Jan 2020 at 15:19

William submitted Solution 2092868 to Problem 225. Subdivide the Segment

on 14 Jan 2020 at 15:55

William submitted Solution 2092866 to Problem 225. Subdivide the Segment

on 14 Jan 2020 at 15:52

William submitted Solution 2091821 to Problem 45250. Be happy

on 13 Jan 2020 at 19:28

William submitted Solution 2090546 to Problem 45265. Restricted Addition v4

on 13 Jan 2020 at 1:36

William submitted a Comment to Problem 45250. Be happy

Asif, Yes, I looked at the information on non-trivial perfect digital invariants. Near the end of that reference, there is a short section entitled "Relation to happy numbers" that indicates that in order for a number to be happy, it needs to be a perfect digital invariant with the value of 1. In this case, the invariant is 8 (or 22 in base-3), so I interprete that as saying that it is a non-trivial PDI, but not happy.

on 10 Jan 2020 at 18:10

William submitted Solution 2088296 to Problem 45252. Restricted Addition v1

on 10 Jan 2020 at 17:38

William submitted Solution 2088294 to Problem 45252. Restricted Addition v1

on 10 Jan 2020 at 17:36

William liked Problem 45264. Restricted Addition v3

on 10 Jan 2020 at 17:28

William submitted Solution 2088276 to Problem 45264. Restricted Addition v3

on 10 Jan 2020 at 17:25

William submitted Solution 2088273 to Problem 45264. Restricted Addition v3

on 10 Jan 2020 at 17:21

William submitted Solution 2088272 to Problem 45264. Restricted Addition v3

on 10 Jan 2020 at 17:20

William submitted Solution 2084032 to Problem 45259. Query edges list

on 8 Jan 2020 at 20:03

William submitted Solution 2084028 to Problem 45259. Query edges list

on 8 Jan 2020 at 19:59

William submitted Solution 2083150 to Problem 45258. Restricted Addition v2

on 7 Jan 2020 at 23:59

William liked Problem 45250. Be happy

on 6 Jan 2020 at 20:46

William submitted a Comment to Problem 45250. Be happy

Well, it appears to me that the number 742356 is a pre-periodic point of the perfect digital invariant n=8 in base 3. However, since the perfect digital invariant is n=8 rather than n=1, this is not a happy number. At least, that is how I read it!

on 6 Jan 2020 at 19:30

William submitted a Comment to Problem 45250. Be happy

Asif: Yes, I am now seeing a discrepancy with problem 6, but all the others agree with my code.

on 6 Jan 2020 at 4:06

William liked Problem 45252. Restricted Addition v1

on 5 Jan 2020 at 15:52

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