# Doug Hull

Formerly known as MATLABDoug during my 15 year tenure at MathWorks. Now I live in Vegas, write poker books and relieve tourists of their poker money.

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**29** Questions

**287** Answers

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VOTES RECEIVED**402**

RANK**51** of 18,457

REPUTATION**14,887**

AVERAGE RATING**4.50**

CONTRIBUTIONS**7** Files

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**Content Feed**

Problem

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. ...

5 years ago | 4 | 113 solvers

Problem

Is this is a Tic Tac Toe X Win?

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. ...

5 years ago | 2 | 495 solvers

Problem

2048 tile game

The popular 2048 game has been implemented here: http://gabrielecirulli.github.io/2048/ Given the board like this: [2...

9 years ago | 0 | 9 solvers

Solved

Get ranking of a combination looking for speed.

I have the numbers pulled without replacement from the set [1 2 3 4 5 6 7 8 9 10 11 12 13]; They are then ordered from least to...

9 years ago

Problem

Get ranking of a combination looking for speed.

I have the numbers pulled without replacement from the set [1 2 3 4 5 6 7 8 9 10 11 12 13]; They are then ordered from least to...

9 years ago | 3 | 46 solvers

Solved

Get ranking of a combination

I have the numbers pulled without replacement from the set [1 2 3 4 5 6 7 8 9 10 11 12 13]; They are then ordered from least to...

9 years ago

Problem

Get ranking of a combination

I have the numbers pulled without replacement from the set [1 2 3 4 5 6 7 8 9 10 11 12 13]; They are then ordered from least to...

9 years ago | 1 | 44 solvers

Solved

Select every other element of a vector

Write a function which returns every other element of the vector passed in. That is, it returns the all odd-numbered elements, s...

10 years ago

Solved

Swap the first and last columns

Flip the outermost columns of matrix A, so that the first column becomes the last and the last column becomes the first. All oth...

10 years ago

Solved

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...

10 years ago

Problem

Siblings of a graphics object

Given a valid, scalar, handle of a graphical object: find the set of all objects that have the same parent as the original that...

10 years ago | 1 | 14 solvers

Solved

Siblings of a graphics object

Given a valid, scalar, handle of a graphical object: find the set of all objects that have the same parent as the original that...

10 years ago

Problem

Implement Solitaire cipher for N long deck.

Implement the <http://en.wikipedia.org/wiki/Solitaire_(cipher) solitaire cypher>. Given a starting permutation of numbers [1:...

10 years ago | 1 | 17 solvers

Solved

Implement Solitaire cipher for N long deck.

Implement the <http://en.wikipedia.org/wiki/Solitaire_(cipher) solitaire cypher>. Given a starting permutation of numbers [1:...

10 years ago

Problem

Flag largest magnitude swings as they occur

You have a phenomenon that produces strictly positive or negative results. delta = [1 -3 4 2 -1 6 -2 -7]; Marching thr...

10 years ago | 12 | 649 solvers

Problem

How many trades represent all the profit?

Given a list of results from trades made: [1 3 -4 2 -1 2 3] We can add them up to see this series of trades made a profit ...

10 years ago | 12 | 574 solvers

Problem

Given a window, how many subsets of a vector sum positive

Given a vector: [1 0 -1 3 2 -3 1] and a window of 2, A sliding window would find: 1 + 0 = 1 0 - 1 = -1 ...

10 years ago | 8 | 831 solvers

Problem

Implement simple rotation cypher

If given a letter from the set: [abc...xyz] and a shift, implement a shift cypher. Example: 'abc' with a shi...

10 years ago | 12 | 1032 solvers

Problem

Solitaire Cipher

Implement the <http://en.wikipedia.org/wiki/Solitaire_(cipher) solitaire cipher>. Since this is from Wikipedia, I am capturin...

10 years ago | 8 | 242 solvers

Solved

Solitaire Cipher

Implement the <http://en.wikipedia.org/wiki/Solitaire_(cipher) solitaire cipher>. Since this is from Wikipedia, I am capturin...

10 years ago

Problem

Steal, Share, or Catch: Tournament of Champions

I am no longer supporting this problem. No changes will be made to put more entries in the test suite, but have fun playing any...

11 years ago | 5 | 9 solvers

Solved

Steal, Share, or Catch: Tournament of Champions

I am no longer supporting this problem. No changes will be made to put more entries in the test suite, but have fun playing any...

11 years ago

Problem

Steal, Share, or Catch

You, I, and a few other characters are going to play a game of *Steal, Share or Catch*. We are going to play it 10,000 times vs...

11 years ago | 4 | 78 solvers

Solved

Steal, Share, or Catch

You, I, and a few other characters are going to play a game of *Steal, Share or Catch*. We are going to play it 10,000 times vs...

11 years ago

Solved

Is my wife right? Now with even more wrong husband

Again, as in "Is my wife right?" ( <http://www.mathworks.com/matlabcentral/cody/problems/149-is-my-wife-right> ), answer 'yes' r...

11 years ago

Solved

Return the first and last character of a string

Return the first and last character of a string, concatenated together. If there is only one character in the string, the functi...

11 years ago

Problem

Cumulative probability of finding an unlikely combination

This is a supplemental problem to the <http://www.mathworks.com/matlabcentral/cody/problems/621-cryptomath-addition CryptoMath> ...

11 years ago | 2 | 32 solvers

Solved

Cumulative probability of finding an unlikely combination

This is a supplemental problem to the <http://www.mathworks.com/matlabcentral/cody/problems/621-cryptomath-addition CryptoMath> ...

11 years ago

Solved

Getting the absolute index from a matrix

This is a basic MATLAB operation. It is for instructional purposes. --- You may already know how to get the <http://www.ma...

11 years ago

Problem

Getting the absolute index from a matrix

This is a basic MATLAB operation. It is for instructional purposes. --- You may already know how to get the <http://www.ma...

11 years ago | 2 | 233 solvers