ChrisR
I teach courses in water resources and environmental fluid mechanics.
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Matrix Patterns I Master
Awarded to ChrisR on 09 Oct 2021
Solve all the problems in Cody5:Easy
Awarded to ChrisR on 05 Jun 2021
Solve all the problems in Functions I
Awarded to ChrisR on 29 Apr 2021
Solve all the problems in Divisible by x
Awarded to ChrisR on 11 Apr 2021
Solve all the problems in Tiles Challenge
Awarded to ChrisR on 24 Mar 2021
Solve all the problems in Matrix Patterns III problem group
Awarded to ChrisR on 06 Dec 2020
Solve all the problems in Strings I
Awarded to ChrisR on 02 Oct 2020
Receive 25 likes on a problem you have created
Awarded to ChrisR on 28 Sep 2020
Solve all the problems in Cody Problems in Japanese problem group
Awarded to ChrisR on 26 Aug 2020
Like a problem or solution
Awarded to ChrisR on 12 Aug 2020
Solve all the problems in Magic Numbers II
Awarded to ChrisR on 02 Aug 2020
Solve all the problems in Sequences & Series I
Awarded to ChrisR on 25 Jul 2020
Content Feed
Solved
row-th maximum row elements
Input a is a square matrix of size n*n. Output vector v is of size 1*n. The ith element of output v is the ith largest element o...
8 days ago
Problem
Compute the largest number whose prime factors sum to n
This problem deals with a sequence whose tenth term is 36 because the prime factors of 36 (2, 2, 3, 3) sum to 10. The number 32 ...
8 days ago | 1 | 4 solvers
Solved
Kaggle: Reverse Game of Life - Single Move to One Cell Case
<http://www.kaggle.com/c/conway-s-reverse-game-of-life Kaggle's Conway's Reverse Game of Life> contest inspires this Single Reve...
11 days ago
Problem
List the cuban primes
The number 61 is a cuban prime because it is prime and the difference two cubes, 64 and 125. Write a function to list the cuba...
12 days ago | 1 | 4 solvers
Solved
Twist 'n' Match
Given n and m, construct an n-by-n matrix a such that a, when rotated 90 degrees and compared with itself, matches itself in exa...
13 days ago
Solved
Poly2mask, drawpolygon or patch
Recently, I tried to plot a polygon in matlab, and I found there is a lot of embedded function that can be used. However, some f...
17 days ago
Solved
Clock Solitaire
Many card players will be familiar with the game of <http://en.wikipedia.org/wiki/Clock_patience Clock Solitaire>. Briefly, th...
18 days ago
Solved
Poker Card Deal!
Anyone want to play a card game? Well this is making one deck of cards, with the option of using 2 jokers. The outputs are ...
19 days ago
Solved
Combine Cards to make 21
Given between two and six cards, e.g. A _ 3 _ 7 _ 6 _ 2 place one of the mathematical symbols (+,-,*,/) in the space betw...
21 days ago
Solved
Easy Sequences 31: N-N's Sequence
We define the N-N's Sequence, as the series of all positive integers in ascending order and with repetition, wherein a appears ...
23 days ago
Solved
Godfather or Goodfather
Recently, I watched the movie called the Godfather. In my opinoin, Vito Corleone is not just a godfather, he is also a good fat...
23 days ago
Solved
Easy Sequences 28: Sum of Radicals of Integers
The radical of a positive integer is defined as the product of the distinct prime numbers dividing . For example, the distinct ...
24 days ago
Solved
Binpack Contest: Retro
The <http://www.mathworks.com/matlabcentral/contest/contests/3/rules Full Binpack Rules and examples>. This Challenge is a re...
24 days ago
Solved
Coin distribution
Imagine, u r in a shop. ur bill is n(2200). u want to pay the bill with minimum no of coins u have. u've coins of - 2000,1000...
25 days ago
Solved
Plotting Practice
Plot cos(x) vs x as shown in the figure below. Include the appropriate title, x-label, and y-label. Note, it is case sensitive. ...
26 days ago
Solved
Easy Sequences 25: Product of Series
The function 'P(n)' is defined as the series product: where 'T(n)' is the triangular sum: ...
26 days ago
Solved
GJam 2017 Kickstart: Leader (Small)
This Challenge is derived from <http://code.google.com/codejam/contest/6304486/dashboard#s=p0 GJam 2017 Kickstart Leader>. This ...
27 days ago
Solved
Easy Sequences 23: Hat Guessing Game!
Consider the following Game Show: Hats, with numbers written on each, were placed on the heads of the participants. Participant...
27 days ago
Solved
Draw matrix 'Swiss flag'( Euro 2020)
Draw a x-by-x matrix 'Swiss flag' using '0' and '1'.(x is odd and bigger than 4) Example x=5 ...
28 days ago
Solved
Non-zero bits in 10^n.
Given an integer that is a power of 10, find the number of non-zero bits, k, in its binary representation. For example: * ...
1 month ago
Solved
Change on Spiral Matrix
n>=3, generate a matrix of nth such that n^2 is the max number, and max number must be in [1,1] or [end, end]. One example will ...
1 month ago
Solved
LIFO Validation
Write a function to check whether a LIFO (Last In First Out) restriction on inventory is violated. We have two input vectors ...
1 month ago
Solved
How to multiply?
* Imagine you are in 3012 Anno Domini, when everyone must learn how to multiply, * and competing for the highly prestigious pos...
1 month ago
Solved
Easy Sequences 18: Set Bits of Triple Summations
The function S(n) is defined by the following triple summations: The double brackets mean that th...
1 month ago
Solved
Create the flag of Ramumbia
The little known nation of Ramumbia has a very simple flag. It is made up of vertical stripes, Red, Green, Blue, that are equall...
1 month ago
Solved
Palindromic Prime
Palindromic Prime is a prime number that is also a palindromic number. (Wiki, OEIS) If given a monotonic series (increment=1) ...
1 month ago
Problem
Multiply binary numbers
Write a function to multiply two binary numbers input as strings. For example, input values of ‘1011’ and ‘101’ should give ’110...
1 month ago | 2 | 5 solvers
