William
Followers: 5
Semi-retired physicist with interests in numerical modeling and mathematics.
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MATLAB Central Community 20 Year Anniversary Treasure Hunt participant badge
Awarded to William on 20 Sep 2021
MATLAB Central Treasure Hunt finisher badge
Awarded to William on 03 Nov 2020
Accept 2 answers given by other contributors
Awarded to William on 15 Feb 2022
10 of your answers have been accepted
Awarded to William on 15 Feb 2022
Solve all the problems in Cody5:Hard
Awarded to William on 09 Jul 2024
Solve all the problems in Computer Games I
Awarded to William on 06 Aug 2022
Solve all the problems in R2016b Feature Challenge
Awarded to William on 01 May 2022
Contribute at least one answer each month for 6 consecutive months
Awarded to William on 02 May 2021
Solve all the problems in Logic problem group
Awarded to William on 12 Feb 2021
3 of your answers have been accepted
Awarded to William on 18 Jan 2021
Obtain 50 solvers for a problem you have created
Awarded to William on 30 Dec 2020
Solve a problem with a best solution
Awarded to William on 21 Dec 2020
Feeds
Solved
Convert integers from proper primary to base 10
The proper primary system of expressing numbers has three digits: m, x, and p, which correspond to -1, 0, and 1. The places in a...
1 day ago
Solved
Play Hocus Focus
The card game Hocus Focus starts by placing twelve cards with wizards face up on a table. The characteristics of the wizards tha...
5 days ago
Solved
Express integers in negabinary
Negabinary numbers are written in base -2. For example, the negabinary number 11010 is , or 6 in base 10. In a similar way, -3 i...
5 days ago
Solved
List the partitions of an integer
Several Cody problems deal with partitions of an integer, or the ways an integer can be written as the sum of positive numbers—...
15 days ago
Solved
Complete hydraulic geometry relations
Hydraulic geometry relations express the velocity , width , and depth of a river as a function of the discharge (or flow) , whi...
19 days ago
Solved
Condition number of Kronecker product
Given NxN matrix A and MxM matrix B, where M,N<=1000, write a routine to compute the condition number of kron(A,B).
1 month ago
Solved
Find an inscribed square on a closed curve
Here's an unproven conjecture from geometry: Every simple closed curve in a plane contains all four vertices of some square. ...
1 month ago
Solved
Determine whether a number is a Ludic prime
Ludic numbers are formed by a sieve. Start with a list of the positive integers. Skip 1 and start with 2. Then delete every seco...
1 month ago
Solved
Identify points inside a Reuleaux triangle
Write a function to identify points that lie in or on a Realeaux triangle, which is a curve of constant width. The input to the ...
1 month ago
Solved
REPMAT Enhancement - Faster for Large Row Replication of Vector
The Challenge is to modify repmat.m to maintain all of its normal functionality and enhance its performance for large row replic...
2 months ago
Solved
Find the closest canyon prime
My wife and I celebrated our honeymoon and most recent anniversary in Yellowstone and Grand Teton National Parks. After returnin...
2 months ago
Solved
List composite numbers that do not contain their prime factors as substrings
The number 63 has the prime factorization 3, 3, and 7, and it contains one of them (3) as a substring. In contrast, the number 4...
2 months ago
Solved
Sum along each diagonal of a matrix
Write a routine that returns the sums along the diagonals of a given matrix, A, where the first diagonal is the bottom left corn...
2 months ago
Solved
Extract diagonal of sparse quadratic form
Consider the matrix A and vector v given by, A=round(sprand(5e3,1e4,1/1e4*100)*100); v=randi(10,width(A),1); Write a rout...
2 months ago
Solved
Build a block Toeplitz matrix
A symmetric block Toeplitz matrix has the form, where the are compatibly-sized matrices. Write a routi...
2 months ago
Solved
TingTing
Output logical "true" if the input is the answer to luck and money$$$. Otherwise, output logical "false".
2 months ago
Solved
2x2 binning of a large sparse matrix
Consider the 20000 x 20000 sparse matrix, A=round(sprand(2e4,2e4,1/1e4*100)*1000); The task is to divide this matrix into 2x...
2 months ago
Solved
Compute the dispersion coefficient
A contaminant dumped or spilled into a river will move downstream with the flow, but it will also spread in the flow direction b...
2 months ago
Solved
List Ormiston prime pairs
The numbers 1913 and 1931 form the first Ormiston prime pair. The numbers are consecutive primes, and they are anagrams of each ...
2 months ago
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