# ChrisR

I teach courses in water resources and environmental fluid mechanics.

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**Content Feed**

Solved

Cyclotomic polynomial

Given a Natural number (N), return the corresponding Cyclotomic Polynomial.

3 dagar ago

Solved

Find the biggest empty box

You are given a matrix that contains only ones and zeros. Think of the ones as columns in an otherwise empty floor plan. You wan...

5 dagar ago

Solved

resistor ladder

* You have a bunch (an odd number N) of identical resistors (each R ohms), a good battery (V volts), and a high impedance voltme...

5 dagar ago

Problem

Count estrangements

Recently I made a puzzle for my wife that included a cryptogram, which involves an arrangement of the letters A through Z. I use...

6 dagar ago | 1 | 1 solver

Solved

Nth Order Polynomial Regression

Inputs: -two vectors x and y (row or column) -order of polynomial, p Outputs: -vector of coefficients [b0 b...

10 dagar ago

Solved

Parametric Array

Create a row vector, 1xN (Integer, >1), such that the mean of the vector is M (Real number) and the standard deviation of the ...

13 dagar ago

Problem

List the semiprimes

A semiprime number—or a 2-almost prime—is the product of two prime numbers. The numbers and are semiprimes, but and are not....

13 dagar ago | 0 | 4 solvers

Solved

Nodal Voltage of Resistor Ladder Network

* You have a bunch (an even number N) of identical resistors (each R ohms), a good battery (V volts) and a high impedance voltme...

27 dagar ago

Solved

How many palindromes?

* Given a set of letters, count all possible palindromes, using all of those letters. * For example, if the set is {'A' 'A' 'A'...

27 dagar ago

Solved

Oxidation State

* In some chemical compounds, the oxidation state of each atom of hydrogen H is +1. * In some chemical compounds, the oxidation...

28 dagar ago

Problem

Determine whether one vector is a subset of another

While bumbling through a pair of problems in the Number Theory group, I wrote code to determine whether a vector is a subset of ...

28 dagar ago | 2 | 6 solvers

Solved

Parcel Routing

Given a matrix that represent the distance along highways between major cities numbered 1 to _N_, provide the path and shortest ...

29 dagar ago

Solved

Fangs of pseudo-vampire number

given a number, find all the fangs of that number. A pseudo-vampire number can have multiple of fangs. The output should be a...

29 dagar ago

Solved

Find similar/related functions

The help function can be useful for getting quick assistance on a particular function. For most built-in MATLAB functions, a por...

30 dagar ago

Solved

Compute the intersect point of line and plan

Compute the intersect point of line and plan. eg. line AB, the coordinate of A is (1,2,3) the coordinate of B is (-4,-5,-6...

30 dagar ago

Solved

Scorer's Function

Evaluate the Scorer's function for a given input. The expected output is Gi(x). Note - The precision will vary for test cases...

30 dagar ago

Solved

Draw 'W'

For any given n, return a matrix of height n and width 4n-3 containing a W of ones. Example: n=2 ans= [1 0 1 0 1 0 1 0 1 0...

ungefär en månad ago

Solved

Create a fixed format text output

Given a short brief matrix, such as x = [1.2 2.4 3.6; 1.5 2.3 3.5; 1.35 2.35 3.65] and a label 13, create a fixed format text o...

ungefär en månad ago

Solved

Aerodynamic load on a vehicle

Determine the aerodynamic load on a vehicle having aerodynamic drag coefficient , frontal area , moving at speed in an environm...

ungefär en månad ago

Solved

Zigzag array

Given an vector of integers, rearrange the array so that the array looks like: [largest value, smallest value, 2nd largest valu...

ungefär en månad ago

Solved

Draw a triangle of ones

For any given n, return a matrix that includes a triangle of ones of height n: Example n = 3 output = [0,0,1,0,0 ...

ungefär en månad ago

Solved

encuentra el 'string', o serie, mas largo el un vector de 'strings'

Encuentra el 'string' mas largo. Si hay mas de uno del mismo tamano, elige el primero.

ungefär en månad ago

Solved

Minimum number of children to distribute unequal cookie portions

A cruel parent wants to distribute N cookies such that it is impossible for every child to receive the same number of cookies. W...

ungefär en månad ago

Solved

Momentum Calculation

A shopping cart of mass 'm1' is traveling with velocity 'u' and collides with a second shopping cart of mass 'm2.' The two shopp...

ungefär en månad ago

Solved

Ridge regularized linear regression

Given a predictor data matrix of size , target variable vector of size and a shrinkage factor (scalar) (ridge regularization...

ungefär en månad ago

Solved

Calculate Percentage

Given marks obtained and total marks, calculate the percentage.

ungefär en månad ago

Solved

Find all prime factors of the input

Given an input x, find its all prime factors. Return the vector with all factors in ascending order. Efficiency is the key here...

ungefär en månad ago