# ChrisR

I teach courses in water resources and environmental fluid mechanics.

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**Content Feed**

Solved

Latest Question On Cody

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

12 hours 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 days 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...

3 days 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. ...

3 days 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...

5 days 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) ...

6 days 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...

6 days 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...

6 days 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...

7 days ago

Solved

Create Combination

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

8 days 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 <=...

8 days 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...

9 days ago

Solved

nanoseconds passed today

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

10 days 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 ...

11 days 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...

12 days 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...

12 days ago

Solved

String Logic 17

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

12 days 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...

13 days 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 days 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...

17 days ago | 0 | 5 solvers

Solved

String Logic 11

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

17 days ago

Solved

String Logic 10

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

17 days 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...

18 days ago | 1 | 3 solvers

Solved

String Logic 16

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

19 days 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...

19 days ago

Solved

factorial

There are really some cody problems related to factorial of n, e.g., 42667, 45184, 46054, and etc. It is interesting to ask why ...

19 days ago

Solved

String Logic 18

Examples: 'DIG' --> 'DG' 'IMPORTANT' --> 'IPRAT' 'DEAL' --> 'DA' 'LIMB' --> 'LM' 'MOSTLY' --> 'MSL'

19 days ago

Solved

String Logic 19

Examples: 'DIG' --> 'I' 'IMPORTANT' --> 'MOTN' 'DEAL' --> 'EL' 'LIMB' --> 'IB' 'MOSTLY' --> 'OTY'

19 days ago