# David Young

### University of Sussex and University of Southampton

Professional Interests: Image Processing

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**Content Feed**

Solved

Create a row array using double colon operator

Create a row array from 9 to 1, using the double colon operator.

mer än 7 år ago

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Flip the bit

Given an input character string (e.g. '1001'), return a character string with the bits flipped ('0110').

mer än 7 år ago

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Number of Horns on a unicorn!

Calculate the number of horns on a *unicorn*! And I'm talking about a unicorn with not more than one horn on it!

ungefär 9 år ago

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Multiply 2 numbers

Very easy, you just have to multiply 2 numbers but you cannot use the following signs (*, /, - ,^) ,mtimes , times, cross, pro...

mer än 9 år ago

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Find the Kronecker Tensor Product without using KRON

The Kronecker Tensor Product is the result of multiplying all elements of a matrix with each of the elements of another matrix. ...

mer än 9 år ago

Solved

Back to basics 22 - Rotate a matrix

Covering some basic topics I haven't seen elsewhere on Cody. Rotate the input matrix 90 degrees counterclockwise (e.g. [1 2; ...

mer än 9 år 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. ...

mer än 9 år ago

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Is this group simply connected?

Given connectivity information about a graph, your job is to figure out if the graph is fully connected. You are given a list of...

mer än 9 år ago

Solved

Project Euler: Problem 7, Nth prime

By listing the first six prime numbers: 2, 3, 5, 7, 11, and 13, we can see that the 6th prime is 13. What is the Nth prime nu...

mer än 9 år ago

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Smallest distance between a point and a rectangle

Given two points *x* and *y* placed at opposite corners of a rectangle, find the minimal euclidean distance between another poin...

mer än 9 år ago

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Biggest Value in the (Neighbor)Hood

For this challenge you get two inputs: a matrix A and an integer value n. Your function should return a Matrix B of the same si...

mer än 9 år ago

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N-Dimensional Array Slice

Given an N-dimensional array, _A_, an index, _I_, and a dimension, _d_, return the _I_ th elements of _A_ in the _d_ dimension. ...

mer än 9 år ago

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count to vector

Return a matrix of numbers of dimension K by N, where K = prod(v), and N=length(v). The rows count from a vector of ones up to v...

mer än 9 år ago

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Chromatic Tuner

Given a frequency, return the number of cents difference between the given frequency and its nearest semitone (in 12-tone equal ...

mer än 9 år ago

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magic solver

Create a function that returns _true_ and has a cody <http://www.mathworks.com/matlabcentral/cody/problems/256-return-the-size-o...

mer än 9 år ago

Solved

Distance walked 2D

Suppose you go from x-y coordinates [3,4] to [0,0] to [0,1] to [1,1], then you walked 7 units of distance.

mer än 9 år ago

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Give the Shortest Path Through The Maze

*Description* The purpose of this problem is to give the shortest path through a maze. The maze will be provided in a codifie...

mer än 9 år ago

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First N Perfect Squares

*Description* Return the first N perfect squares *Example* input = 4; output = [ 1 4 9 16 ];

mer än 9 år ago

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Valid Chess Moves

Using <http://en.wikipedia.org/wiki/Algebraic_chess_notation standard Algebraic notation> ('' for a pawn), given previous move a...

mer än 9 år ago

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Sorting

Assume that x is an n-by-2 matrix. The aim is to return the first column of x, but sorted according to the second column. Exa...

mer än 9 år ago

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Mechanics 1

I thought I would make a mechanics problem for all those physics lovers out there. Imagine two solid, rigid spheres B1 and B...

mer än 9 år ago

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Find the sum of the elements in the "second" diagonal

Find the sum of the elements in the diagonal that starts at the top-right corner and ends at the bottom-left corner.

mer än 9 år ago

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...

mer än 9 år ago

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Half?

If you toss an even number (x) of coins, what is the probability (y) of 50% head and 50% tail?

mer än 9 år ago

Solved

Read a Soroban Abacus

*Description* The Soroban is the name of the modern Japanese abacus. Information on reading a Soroban can be found <http://we...

mer än 9 år ago

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Distance walked 1D

Suppose you go from position 7 to 10 to 6 to 4. Then you have walked 9 units of distance, since 7 to 10 is 3 units, 10 to 6 is 4...

mer än 9 år ago

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Weighted average

Given two lists of numbers, determine the weighted average. Example [1 2 3] and [10 15 20] should result in 33.333...

mer än 9 år ago

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Clockwise or Counterclockwise

Given a list of 2-d points defining the vertices of a polygon, determine whether these points are sorted clockwise. The input...

mer än 9 år ago

Solved

Who knows the last digit of pi?

There is only one man who knows the last digit of pi, who is that man? Give the name of that man, who, by popular believe, can ...

mer än 9 år ago