# Jonathan

Last seen: 3 years ago Active since 2011

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Matrix spiral
Make a spiral in a (n*n) matrix. The spiral has to start in the top left, and has to rotate clockwise to the center. The spiral ...

3 years ago

Solved

Twist 'n' Match
Given n and m, construct an n-by-n matrix a such that a, when rotated 90 degrees and compared with itself, matches itself in exa...

3 years ago

Solved

Plot Damped Sinusoid
Given two vectors |t| and |y|, make a plot containing a blue ( |b| ) dashed ( |--| ) line of |y| versus |t|. Mark the minimum...

4 years ago

Solved

Create Circular Perfect Square Sequence
A sequence v(1:N) made of values 1:N can be created for N>31 such that v(i)+v(i+1) is a perfect square. The sum of v(N)+v(1) mus...

4 years ago

Solved

Hamiltonian Cycle
This is related to the Travelling Salesman Problem <http://www.mathworks.com/matlabcentral/cody/problems/1339 1339> created by...

4 years ago

Problem

Find a Hamiltonian Cycle in a Graph
You are given a graph g and asked to find a Hamiltonian cycle of g. See <https://www.mathworks.com/help/matlab/ref/graph.html...

4 years ago | 0 | 2 solvers

Solved

Sudoku Solver - Standard 9x9
Solve a Standard 9x9 <http://en.wikipedia.org/wiki/Sudoku Sudoku>. Values 1 thru 9 occur in each row, column, and the nine non-o...

4 years ago

Solved

GJam 2014 China Rd B: Sudoku Checker
This Challenge is derived from <http://code.google.com/codejam/contest/2929486/dashboard#s=p0 GJam 2014 China Sudoku>. Large Cas...

4 years ago

Solved

The sliding puzzle: 15
If you are unfamiliar with the sliding puzzle, enter the command _fifteen_ in your MATLAB command window (or search online, of c...

4 years ago

Solved

The glass half full
Identical glasses are placed in a triangular tower structure, such that the top level (L = 1) comprises one glass, the next leve...

4 years ago

Solved

Sums of Multiple Pairs of Triangular Numbers
This is a follow-up to <https://www.mathworks.com/matlabcentral/cody/problems/44289 Problem 44289> - Find two triangular numbers...

4 years ago

Solved

Find two triangular numbers whose sum is input.
Find two triangular numbers whose sum is _input_. Note: The difference beetween the triangular numbers should be minimum.

4 years ago

Solved

MATLAB Counter
Write a function f = counter(x0,b) to construct a counter handle f that counts with an initial value x0 and a step size b. E...

4 years ago

Solved

Breaking Out of the Matrix
Do you want to take the Red Pill, or the Blue Pill? If you take the Blue Pill, you will simply pass along to the next problem...

4 years ago

Solved

The Top 5 Primes
This problem series invites you to solve two simple problems related to the integer NUMBER FIVE, in order to celebrate <https://...

4 years ago

Solved

Polarisation
You have n polarising filters stacked one on top of another, and you know each axis angle. How much light gets passed through th...

4 years ago

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ASCII Birthday Cake
Given an age and a name, give draw an ASCII birthday cake. For example, given the name "CODY" and the age 5, return a string wit...

4 years ago

Solved

Matlab Basics II - squares
Write a function that takes matrix A, and squares each element in the matrix example: A = [1 2 3] output = [1 4 9]

4 years ago

Solved

The sliding puzzle: 3D
This is an extension of <https://www.mathworks.com/matlabcentral/cody/problems/42842 problem 42842>. In this case, the puzzle is...

4 years ago

Problem

Restricted Multiplication v1

4 years ago | 1 | 7 solvers

Problem

Restricted Subtraction v1

4 years ago | 1 | 9 solvers

Solved

Divisible by n, Composite Divisors
Pursuant to <http://www.mathworks.com/matlabcentral/cody/problems/42453-divisible-by-n-prime-vs-composite-divisors Divisible by ...

4 years ago

Solved

Divisible by n, Truncated-number Divisors
Some divisors only require a few numbers at the end of the number in question to determine divisibility, no matter how long. Exa...

4 years ago

Solved

Divisible by n, prime divisors from 20 to 200
Pursuant to the previous problem (linked below), this problem requires a function that checks for divisibility of large numbers ...

4 years ago

Solved

Divisible by n, prime divisors - 11, 13, 17, & 19
Divisibility checks against prime numbers can all be accomplished with the same routine, applied recursively, consisting of add ...

4 years ago

Problem

4 years ago | 1 | 8 solvers

Solved

Find my secret number
I try to hide a secret number in the workspace amongst others variables. I am paranoid so I change his value and his name a...

4 years ago

Solved

Mirror, mirror on the wall, who is fairest of them all?
The Elo rating system was featured in the movie *The Social Network* during the <https://www.youtube.com/watch?v=BzZRr4KV59I/ al...

4 years ago

Problem