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# ChrisR

Last seen: Today Active since 2015

I teach courses in water resources and environmental fluid mechanics.

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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...

ongeveer een uur ago | 0 | 0 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...

ongeveer 7 uur 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...

ongeveer 15 uur ago | 0 | 0 solvers

Solved

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

1 dag 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],[...

3 dagen 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...

4 dagen 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. ...

4 dagen 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...

6 dagen 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) ...

7 dagen 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...

7 dagen 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...

7 dagen 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...

8 dagen ago

Solved

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

9 dagen 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 <=...

9 dagen 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...

10 dagen ago

Solved

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

10 dagen 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 ...

12 dagen 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...

13 dagen 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...

13 dagen ago

Solved

String Logic 17
Examples: 'DIG' --> 'GDI' 'IMPORTANT' --> 'TANTIMPOR' 'DEAL' --> 'EALD' 'LIMB' --> 'IMBL' 'MOSTLY' --> 'YMOSTL'

13 dagen 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...

14 dagen 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...

16 dagen 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...

18 dagen ago | 0 | 5 solvers

Solved

Find Logic 29

18 dagen ago

Solved

Find Logic 30

18 dagen ago

Solved

String Logic 11
Examples: 'SUNDAY' --> 6 'MONDAY' --> 6 'TUESDAY' --> 7 'WEDNESDAY' --> 9 'THURSDAY' --> 8 'FRIDAY' --> 5 'SATURDAY' --...

18 dagen ago

Solved

String Logic 10
Examples: 'SUNDAY' --> 83 'MONDAY' --> 77 'TUESDAY' --> 84 'WEDNESDAY' --> 87 'THURSDAY' --> 84 'FRIDAY' --> 70 'SATURD...

18 dagen ago

Problem

Evaluate the Kelvin functions
The Kelvin functions ber, bei, ker, and kei are related to Bessel functions of order . When the order is not specified, the defa...

19 dagen ago | 1 | 3 solvers

Solved

String Logic 16
Examples: 'DIG' --> 'DIG' 'KIMBALL' --> 'ALLKIMB' 'DEAL' --> 'EALD' 'LIMB' --> 'IMBL' 'MADE' --> 'ADEM'

20 dagen ago

Solved

perfect square
Perfect square is amazing, so we have problems like 45183, 34482, 44683, and 44957. But how can we find a large number is a pe...

20 dagen ago