# ChrisR

I teach courses in water resources and environmental fluid mechanics.

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**Content Feed**

Solved

GJam 2017 Kickstart: Parentheses (Large)

This Challenge is derived from <http://code.google.com/codejam/contest/6304486/dashboard#s=p2 GJam 2017 Kickstart Parentheses>. ...

2 days ago

Solved

GJam 2017 Kickstart: Parentheses (Small)

This Challenge is derived from <http://code.google.com/codejam/contest/6304486/dashboard#s=p2 GJam 2017 Kickstart Parentheses>. ...

2 days ago

Solved

Make a function that returns its own character count

Write a function that returns a 128 element vector with an accurate inventory of the ASCII characters in its own function file. ...

6 days ago

Solved

Cricket - Average Partnership Contribution

The (infamous) Duckworth-Lewis method uses statistical models of how much each wicket partnership is worth to an innings (on ave...

6 days ago

Problem

Compute the unitary totient of a number

The totient function , the subject of Cody Problems 656 and 50182, gives the number of integers smaller than that are relativel...

7 days ago | 1 | 1 solver

Problem

Sum the unitary divisors of a number

Cody Problems 1933 and 46898 deal with , the sum of divisors function. This problem deals with , the sum of unitary divisors fun...

8 days ago | 1 | 6 solvers

Problem

Count the unitary divisors of a number

Cody Problem 56738 asks for a list of the unitary divisors of a number. For this problem, write a function to count the unitary ...

9 days ago | 0 | 6 solvers

Problem

List unitary divisors of a number

A unitary divisor of a number divides and satisfies gcd(,) = 1. For example, 9 is a unitary divisor of 18 because gcd(9,2) = ...

9 days ago | 0 | 6 solvers

Solved

Determine if a given input is even or odd?

Given an input, determine if even or odd.

10 days ago

Solved

Cumulative minimum of an array

Find the cumulative minimum of an array without using the built-in function <http://www.mathworks.com/help/matlab/ref/cummin.htm...

10 days ago

Solved

Cumulative maximum of an array

Find the cumulative maximum of an array without using the built-in function cummax (and a few others). Your function should act ...

10 days ago

Solved

Spectral Distance - Speed Scoring

Find quantity of pixels within a spectral distance from a given [r,g,b] spectra. *Spectral distance* = sqrt( (r0-ri)^2+(g0-gi...

10 days ago

Solved

Cricket - Career Batting Statistics

Given a vector s of strings representing a batter's individual innings scores, return their career statistics as a 4-element (nu...

11 days ago

Solved

IQpuzzler Preparation #2: Detect isolated zeros in a 2D matrix

Return true if any isolated single zeros are present in the input M-by-N matrix (zeros with all adjacent elements being non-zero...

12 days ago

Solved

Estimating Euler's (Oi-ler-z) Number

Euler's number is an irrational constant given by Starting with x=0, count the number of times you can add a uniformly distrib...

12 days ago

Solved

A Binary Search

One way to locate a target value in a sorted array, is to use a binary search algorithm. Here, you test if the midpoint in the a...

12 days ago

Solved

Generate Pascal's Triangle Matrix

Pascal's triangle is an arrangement of numbers where each value is the sum of the values adjacent to it in the previous row: ...

12 days ago

Solved

Where the Four Corners Am I? (Vectorized)

NOTE: this problem is intended to build on problem #55960 ("Where the Four Corners Am I?"). You may wish to solve that problem f...

13 days ago

Solved

Create block matrix of integers (j+k-1) - Part II

Given m, n, p, and q, create an m-by-n matrix made up of submatrices, each sized p-by-q (if possible - the last row and column o...

13 days ago

Solved

Possible Rugby Scores

Given a natural number s (> 4), representing a rugby team's score, return an n-by-3 matrix representing all n possible combinati...

13 days ago

Solved

Acid-Base Chemistry: Which side of the reaction is more favorable?

In an Acid-Base reaction, there is always going to be an acid, a base, a conjugate acid, and a conjugate base. When provided wit...

13 days ago

Solved

Euclidean distance from a point to a polynomial

A not uncommon problem in the area of computational geometry is to find the closest point to a straight line from a given point,...

16 days ago

Solved

Calculate Angle From Axis

Given coordinates x and y, an axis ("X" or "Y"), and a direction ("cw" or "ccw", meaning clockwise and counterclockwise, respect...

16 days ago

Solved

Interpolated Value Between Two Points

Given two points, and , a new location x, and a method "linear" or "cubic", return the value of a linear or cubic interpolant t...

16 days ago

Solved

Next Tribonacci Number

The "Tribonacci" sequence is an extension of the idea of the Fibonacci sequence: That is, each new term is the sum of the thr...

16 days ago

Solved

Angle Between Analog Clock Hands

Given a datetime variable t, return the angle (in degrees) between the hour and minute hands of an analog clock at the time repr...

17 days ago

Solved

Boustrophedon

Given a vector v and a positive integer n, return an m-by-n matrix containing the elements of v row-wise, alternating left-to-ri...

18 days ago