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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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Solved


List Proth primes

3 hours ago

Solved


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

Solved


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

Solved


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

Solved


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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Persistence will not help you solve this problem.
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

Solved


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

Solved


Flip the matrix as -

4 days ago

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Determine if input is even

9 days ago

Solved


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

Solved


Add 100

10 days ago

Solved


Similar triangles

13 days ago

Solved


Highest building

13 days ago

Solved


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

Solved


The tallest man in the world

14 days ago

Solved


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

Solved


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

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