# ChrisR

I teach courses in water resources and environmental fluid mechanics.

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**Content Feed**

Problem

Compute the effective conductivity of more heterogeneous aquifers

Cody Problem 52070 asked for a function to compute the effective hydraulic conductivity of a heterogeneous aquifer—or the single...

23 minutes ago | 0 | 0 solvers

Solved

Maintain shape of logical-index mask

When using logical indexing into an array, MATLAB returns a vector output. For example, if A = magic(3); mask = logi...

1 day ago

Solved

Initialize a varible with an integer value from a another variable which is assigned with a character value.

Initialize a varible with an integer value from a another variable which is assigned with a character value. ex: Test = 'c'...

1 day ago

Solved

chance in percent for minimum K heads when a good coin is tossed N times?

For example, chance is 100% for minimum 0 heads when a coin is tossed 7 times. Chance is 50% for minimum 2 heads when a coin is...

2 days ago

Solved

deconvolution

* Suppose there is a vector v like [1 0 0 -1], representing polynomial coefficients. * In this example, the polynimial is 1*x^3...

2 days ago

Solved

Acidity of vinegar and salts

Assuming: pH (potentia hydrogenii) = - log10(H+ ionic concentration in mol/Liter). For a buffer solution containing acetic acid ...

2 days ago

Solved

Aufbau principle

Given the order e=[1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p], find a vector x with these condi...

2 days ago

Solved

Monte-Carlo integration

Write a function that estimates a d-dimensional integral to at least 1% relative precision. Inputs: * d: positive integer....

4 days ago

Solved

Game of Nim

The Game of Nim is a famous studied 2 player strategy game. <http://en.wikipedia.org/wiki/Nim> There are 3 heaps, and you...

4 days ago

Solved

Throwing Dice - Will You Be Eaten By The Dragon?

You and a dragon have agreed to let dice rolls determine whether it eats you or not. The dragon will roll a single die, of x ...

5 days ago

Solved

Combine complex conjugates first when computing the product of vector

Analytically, the product of complex conjugates yields a real result. When numerically computing the product of a vector contai...

5 days ago

Solved

Time reverse indices

Time reverse the index values as follows IndexIn = [7 1 0] IndexOut = [7 6 0] Note that the indices are zero based and so...

6 days ago

Solved

Wordle

Wordle is an english game where you need to guess a 5 letter word. For each guess you'll receive a feedback for the placement of...

6 days ago

Solved

Pancakes for everyone!

Accordingly to the <http://nl.mathworks.com/matlabcentral/cody/problems/42460-the-cake-is-a-lie problem 42460>. All the children...

7 days ago

Solved

Scrabble Scores - 5

This problem is part of a set of problems that successively develop a more sophisticated Scrabble scoring routine. The point dis...

7 days ago

Solved

Scrabble Scores - 4

This problem is part of a set of problems that successively develop a more sophisticated Scrabble scoring routine. The point dis...

7 days ago

Solved

Calculate SNR in dB using original signal and quantized signal

origs: the original signal quants: the quantized signal *hint* : need to calculate the quantization error and plug into SN...

8 days ago

Solved

Sum of two number using (regexp, varargin) comand?

Sum two number a &b and get there result in c using the rexp and varargin comand.

8 days ago

Solved

summation of the reciprocals

Determine the summation of the reciprocals of numbers with length equal to N,in the meanwhile there is a digit K excluded from t...

8 days ago

Solved

A (wrong) place for everything, and everything in its (wrong) place

You have an equal number of cups and balls, each labelled from one to N. You randomly place one ball in each cup. Determine th...

9 days ago

Solved

String math

You will be given a string that describes a simple math equation. Your job is to determine if the value of the equation is equal...

9 days ago

Solved

Look and say Conway's sequence

In mathematics, the look-and-say sequence is the sequence of integers beginning as follows: 1, 11, 21, 1211, 111221, 312211, ...

9 days ago

Solved

Scrabble Scores - 6

This problem is part of a set of problems that successively develop a more sophisticated Scrabble scoring routine. The point dis...

10 days ago

Solved

Is this a valid Tic Tac Toe State?

For the game of <https://en.wikipedia.org/wiki/Tic-tac-toe Tic Tac Toe> we will be storing the state of the game in a matrix M. ...

10 days ago

Problem

List the dopey numbers

If vile numbers have binary representations that end with an even number of zeros (even vile), then numbers with binary represe...

10 days ago | 1 | 4 solvers

Solved

Find a Prime Number

Find a prime number from a vector Example: [2 51 8 65 19] a = 51

11 days ago

Solved

Unique dice configurations

Given a number of dice N and the number of sides on each die S, write a MATLAB function that will output how many unique permuta...

11 days ago