# ChrisR

I teach courses in water resources and environmental fluid mechanics.

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**Content Feed**

Solved

GJam: 2013 China Event: Cannon Angle

This Challenge is derived from <http://code.google.com/codejam/contest/2933486/dashboard#s=p1 GJam 2013 China Captain Hammer>. T...

circa 14 ore ago

Solved

Is this group simply connected?

Given connectivity information about a graph, your job is to figure out if the graph is fully connected. You are given a list of...

circa 19 ore ago

Solved

Matrix Transposition

Given a matrix and an index, perform matrix transposition as follows - Replace non-corner value of ith ring from outside, with...

1 giorno ago

Solved

SLP Calculation

The SLP Calculation Challenge is to implement SLP sequences and output the result as a string. SLP, Straight Line Program, creat...

2 giorni ago

Problem

Determine whether a number is practical

A number is practical if all smaller numbers can be written as a sum of the proper divisors of . The number 24 is practical bec...

3 giorni ago | 1 | 2 solvers

Solved

Define an arithmetic sequence

Given three numbers n, a, and d, define an arithmetic sequence of n terms with a being the initial term of the sequence and d be...

3 giorni ago

Problem

Solve an ODE: precocious pair’s porcine pursuit

In our previous encounters with Matilda and Labrun, the scintillating siblings collected candy wrappers, amused others with card...

4 giorni ago | 0 | 1 solver

Solved

Latest Question On Cody

Get the problem number of the latest submitted Problem on Cody. Copying the test suite code might not help.

4 giorni ago

Solved

Find the slope of a line that passes through two vectors

Given two vectors p1 and p2, return the slope of a line that passes through p1 and p2. Examples: Input [p1,p2] = deal([0,1],[...

6 giorni ago

Problem

Generate the Figure-Figure sequence

After discussing Scott Kim’s FIGURE-FIGURE Figure (below) in Gödel, Escher, Bach, Douglas Hofstadter introduced an integer seque...

7 giorni ago | 1 | 3 solvers

Solved

Ramanujan's Number

About 1729 1729 is the first positive integer which can be expressed as the sum of two positive cubes in two different ways. ...

7 giorni ago

Solved

Factor Digits

Check if a given number in an array of numbers is - Equidigital Number - A number that has the same number of digits as the num...

9 giorni ago

Solved

Cellular Automaton | Rule X

Cellular Automata (CA) provide a convenient way to represent many kinds of systems in which the values of cells (either 0 or 1) ...

10 giorni ago

Solved

Decimal Fraction to binary conversion

Given an fraction decimal number n, convert it to its equivalent binary number. If it is an infinite binary fraction, keep it...

10 giorni ago

Solved

Check Digit - 02

Given a list of ISBN's, check whether they're valid or not. Prev Prob - <https://www.mathworks.com/matlabcentral/cody/problem...

10 giorni ago

Solved

Smallest distance between a point and a rectangle

Given two points *x* and *y* placed at opposite corners of a rectangle, find the minimal euclidean distance between another poin...

11 giorni ago

Solved

Create Combination

Motivation: In many problems, we need to create combinations with the function nchoosek. In some cases, however, choices are lim...

12 giorni ago

Solved

NCHOOSEK - Time Optimization

*Input* * *V* —— Set of all choices, a vector of N, 1 < N < 100 * *K* —— Number of selected choices, a scalar, 0 <= K <=...

12 giorni ago

Solved

Persistence will not help you solve this problem.

Create a function without inputs that adds one to the output every time it is called. A different possibility of solving this ha...

13 giorni ago

Solved

nanoseconds passed today

Calculate the amount of nanoseconds passed in the current day of a certain date string.

13 giorni ago

Solved

Persistence will help you solve almost any problem.

Create a function without inputs that adds one to the output every time it is called. a = counterfun; disp(a) >> 1 ...

15 giorni ago

Solved

Probabilities - Balls and urns - 02

The urn contains B blue balls and R red balls. Each trial consists of drawing one random ball from the urn and observing its col...

16 giorni ago

Solved

Probabilities - Balls and urns - 01

The urn contains B blue balls and R red balls. Each trial consists of drawing one random ball from the urn and observing its col...

16 giorni ago

Solved

String Logic 17

Examples: 'DIG' --> 'GDI' 'IMPORTANT' --> 'TANTIMPOR' 'DEAL' --> 'EALD' 'LIMB' --> 'IMBL' 'MOSTLY' --> 'YMOSTL'

16 giorni ago

Problem

Determine whether the input is an anagram number

In Cody Problem 44293, Mehmet OZC asks us to spell numbers as words. For example, 67 would be “sixty-seven” and 76 would be “sev...

17 giorni ago | 0 | 4 solvers

Solved

Exhaust all possible logical vectors

Input a length argument and list all possible logical vectors of that length. My solution is of size 29. Can you find an even s...

20 giorni ago

Problem

LIst the Euclid numbers

Euclid proved that the number of primes is infinite with the following argument. Suppose the primes form a finite set , , . Comp...

21 giorni ago | 0 | 5 solvers

Solved

String Logic 11

Examples: 'SUNDAY' --> 6 'MONDAY' --> 6 'TUESDAY' --> 7 'WEDNESDAY' --> 9 'THURSDAY' --> 8 'FRIDAY' --> 5 'SATURDAY' --...

21 giorni ago