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# William

##### Last seen: Today
4,737 total contributions since 2012

Semi-retired physicist with interests in numerical modeling and mathematics.

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List Proth primes

3 hours ago

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Spiraling out of control....
Imagine a square with corners at the origin and at (1,1). An interesting spiral can be created by tracing the path of a moving ...

18 hours ago

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How many ways to write
How many ways to write a positive integer x as the sum of n numbers , where , x>n and no n number is less than -2.

19 hours ago

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Flip coins

2 days ago

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Portfolio diversification: choose your stocks !
we have the returns of 3 stocks for the last 4 years and we have to combine only 2 stocks that are less correlated. Example: ...

2 days ago

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USC Fall 2012 ACM: Driving the Rover
This Challenge is to solve Question E, Driving the Rover, of the <http://contest.usc.edu/index.php/Fall12/Home USC ACM Fall 2012...

2 days ago

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Create a function without inputs that adds one to the output every time it is called. A different possibility of solving this ha...

2 days ago

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Spell the number
Using the British short scale notation, write a function to return the correct spelling of a number passed as a numeric string i...

3 days ago

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Solve an ODE: equation A

3 days ago

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Flip the matrix as -

4 days ago

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Determine if input is even

9 days ago

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Apply Function to Each Field of a Structure Array: Part 1
The builtin <http://www.mathworks.com/help/matlab/ref/structfun.html?=structfun structfun> applies a function handle to each fie...

9 days ago

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10 days ago

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Similar triangles

13 days ago

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Highest building

13 days ago

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Digits Multiplication

13 days ago

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Normalizing a vector

13 days ago

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End Digits

13 days ago

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Min-Max digit

13 days ago

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Do you have the minimum age?

13 days ago

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The tallest man in the world

14 days ago

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Graph Algorithms - 1 : Length of the largest closed path
An undirected simple graph is given as the form of an adjacency matrix. Find the length of the largest closed path (one that sta...

14 days ago

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Rearrange coefficients after block based DCT transform.
Two dimensional block-based discrete cosine transform <http://en.wikipedia.org/wiki/Discrete_cosine_transform#DCT-II (DCT-II)> i...

15 days ago