# ChrisR

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I teach courses in water resources and environmental fluid mechanics.

**Programming Languages:**

MATLAB

**Spoken Languages:**

English

**Pronouns:**

He/him

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**Feeds**

Solved

Find out if the given number is a square of natural number.

For example , Input =4,output =1 Input=1,output=1 Input=0,output=0 Input=8,output=0

3 dagar ago

Problem

Explore the twin prime Goldbach conjecture

The Goldbach conjecture says that every positive even integer greater than 2 can be expressed as the sum of two prime numbers in...

13 dagar ago | 2 | 5 solvers

Solved

The Prime Days of Christmas

On the first day of Christmas my true love sent to me partridges in a pear tree. On the second day of Christmas my true love s...

ungefär en månad ago

Solved

Conditional transpose II

As in problem 60734, you're given two vectors, x and y, which might be row or a column vectors. Your task is to ensure that y ha...

ungefär en månad ago

Solved

Conditional transpose

You're given two vectors of the same length, x and y, which might be row or a column vectors. Your task is to ensure that y has ...

ungefär en månad ago

Solved

Delete some elements in the natural set and find the sum of the first n terms

Delete the number (except 0，1) with a complete square number from the natural set of numbers, form a new set of numbers, find th...

ungefär en månad ago

Solved

Wheatstone bridge

Determine if a set of resistors maintain Wheatstone bridge equilibrium

ungefär en månad ago

Solved

Organic Chemistry

Determine the names of the organic component formed with carbon and hydrogen. For example, if n=1 the name is methane

ungefär en månad ago

Problem

Find the closest geyser prime

My wife and I celebrated our honeymoon and our recent anniversary in Yellowstone and Grand Teton National Parks. After returning...

ungefär en månad ago | 1 | 6 solvers

Problem

Remove the diagonal of a square matrix

Some Cody problems ask solvers to remove columns (e.g., 7), and others ask solvers to remove rows (e.g., 44033). Write a funct...

ungefär en månad ago | 0 | 8 solvers

Solved

Convert RGB to Grayscale

Convert a 3 element RGB array to its correspoding grayscale pixel (a scalar) *Hint: a formula exists!

ungefär 2 månader ago

Solved

Palindrome Checker

Check to see if a given string is a palindrome (a word, phrase, or sequence that reads the same backward as forward). Output sh...

ungefär 2 månader ago

Solved

Reverse a string

Return a string with the characters in reverse order from a given input string Ex: my_str = "Ciao" function should output "...

ungefär 2 månader ago

Solved

Sum All Positive Elements

Output a scalar that is equal to the sum of all positive elements in a given vector/matrix. For Example: The sum of all positi...

ungefär 2 månader ago

Solved

Diagonal Product of A Square Matrix

For a matrix A, calculate the product of its diagonal elements. * Assume all input matrices are square & corresponding element...

ungefär 2 månader ago

Problem

Sum the reciprocals of polygonal numbers

As explained in Cody Problem 60571, a polygonal number is the number of dots arranged in the shape of a regular polygon. For exa...

3 månader ago | 0 | 4 solvers

Solved

Determine which fields have been modified in a structure

Given two input structures (s1, s2), determine which field values have been modified in s2 compared to s1. Your output should be...

3 månader ago

Solved

ICFP2024 001: Lambdaman 6

The ICFP2024 contest was held June29 thru July 1. The contest consisted of five parts: ICFP Language, Lambdaman maze, Starship f...

3 månader ago

Solved

ZigZag - 04

Given a matrix, print all its elements in the spiral form (clockwise direction). For example, a=[16 2 3 13 ...

3 månader ago

Problem

List primes of the form xy+z

Consider three consecutive integers , , and . When is the number prime? For example, if or , then the results are 17 and 37, ...

3 månader ago | 0 | 7 solvers

Solved

Interval Compression

Given a set of integers, the task is to create a list of closed intervals where each interval includes its endpoints. For exampl...

3 månader ago

Solved

Perimeter of a Koch snowflake

A Koch snowflake is an iteratively generated (fractal) shape built out of successively smaller equilateral triangles by followin...

3 månader ago

Solved

AZPC Oddly Triangular: Small N Part 1 of 5

AZPC created the Oddly Triangular contest on 9/7/22. The challenge is to find the longest sequence of N odd digits such that sum...

3 månader ago

Problem

Find polygonal numbers that are Blum integers

A polygonal number is the number of dots arranged in the shape of a regular polygon. For example, 15 is a triangular number beca...

3 månader ago | 0 | 6 solvers

Solved

Given a Polyshape_01 (ps) Return its Perimeter, Area, and Centroid.

Return the perimeter (P) of a polyshape object, which is the sum of the lengths of its boundaries. Return the total area (A) of...

3 månader ago

Problem

Determine whether a number is a Blum integer

A Blum integer is a semiprime—that is, the product of two distinct primes—whose factors have the form for some integer . The nu...

3 månader ago | 0 | 7 solvers

Solved

Jigsaw 001: Intro 2x2 square. Pieces 128x128

This challenge is to re-assemble camerman.tif in grayscale from four 128x128 pieces into a 256x256 image. The pointer layou...

4 månader ago

Problem

Compute the number of squares a knight can reach after n moves

Several Cody problems involve knights from chess. They have asked players to find a knight’s tour in a matrix (CP 96), determine...

4 månader ago | 0 | 6 solvers

Solved

Write a MATLAB function that takes a positive integer ( n ) as input and returns the sum of all the even numbers from 1 to ( n ).

Write a MATLAB function that takes a positive integer ( n ) as input and returns the sum of all the even numbers from 1 to ( n )...

4 månader ago

Solved

Implement the signum function

The signum function is a common mathematical function, which has the following definition : If x => 0, its value is 1, if x < 0...

4 månader ago