# ChrisR

I teach courses in water resources and environmental fluid mechanics.

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**Content Feed**

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...

9 hours 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...

10 hours 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...

1 day ago | 0 | 0 solvers

Solved

Nth Order Polynomial Regression

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

5 days 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 ...

8 days 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....

8 days 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...

22 days 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'...

23 days 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...

23 days 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 ...

23 days 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 ...

24 days 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...

24 days 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...

25 days 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...

25 days 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...

25 days 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...

27 days 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...

27 days 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...

27 days 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...

27 days 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 ...

27 days 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.

27 days 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...

27 days 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...

27 days 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...

27 days ago

Solved

Calculate Percentage

Given marks obtained and total marks, calculate the percentage.

27 days 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...

27 days ago

Solved

Sum of 2 numbers in array

Given an array and a target sum, return true if any 2 numbers in the array sum up to the given target sum. Both numbers cannot h...

27 days ago