# William

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

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**Content Feed**

Solved

ICFP2021 Hole-In-Wall: Figure Validation with Segment Crossing and Segment on Wall Checks

The ICFP held its annual 3-day contest in July 2021 with Hole-In-Wall. Contest Specification. The contest folds the figure in R...

3 days ago

Solved

ICFP2021 Hole-In-Wall: Solve Score=0, where number Hole Vertices = Figure Vertices

The ICFP held its annual 3-day contest in July 2021 with Hole-In-Wall. Contest Specification. The contest folds the figure in R...

3 days ago

Solved

ICFP2021 Hole-In-Wall: Figure Validation with Segment Crossing Check

The ICFP held its annual 3-day contest in July 2021 with Hole-In-Wall. Contest Specification. The contest folds the figure in R...

6 days ago

Solved

Guess the number I'm thinking of (Part 2)

Have you tried the original "Guess the number I'm thinking of" (Problem 44630)? This problem is just like that, except that the...

7 days ago

Solved

ICFP2021 Hole-In-Wall: Figure Validation

The ICFP held its annual 3-day contest in July 2021 with Hole-In-Wall. Contest Specification. The contest folds the figure in R...

8 days ago

Solved

ICFP2021 Hole-In-Wall: Calculate Score

The ICFP held its annual 3-day contest in July 2021 with Hole-In-Wall. Contest Specification. The contest folds the figure in R...

9 days ago

Solved

Palindromic Prime

Palindromic Prime is a prime number that is also a palindromic number. (Wiki, OEIS) If given a monotonic series (increment=1) ...

11 days ago

Solved

Bessel Polynomials

Return the n-th Bessel polynomial Assume that n is a non-negative finite integer. bessel_poly(0) ans = 1 bessel_poly(1) ...

12 days ago

Solved

Which Prime

Given two prime numbers, specify the relation between them i.e. - 'Twin Prime', 'Cousin Prime', 'Sexy Prime' or 'None'

12 days ago

Solved

List Honaker primes

The number 131 is the 32nd prime number. It is a Honaker prime because the sum of its digits (1+3+1) equals the sum of the digit...

12 days ago

Solved

Hoax Numbers

A Hoax Number (OEIS A019506) is defined as a composite number, whose sum of digits is equal to the sum of digits of its distinct...

12 days ago

Solved

Find numbers in the Popular Computing Z-sequence

Here’s a quick one. In 1977 the magazine Popular Computing sought “problem situations for which the computer is the best (if not...

15 days ago

Solved

Draw a x-by-x matrix 'Denmark flag'(Euro(2020)

Draw a x-by-x matrix 'Denmark flag' using '4' and '1'.(x is odd and bigger than 4) Number 4: Caption S.Kjær and number 1: K.S...

18 days ago

Solved

Draw matrix 'Swiss flag'( Euro 2020)

Draw a x-by-x matrix 'Swiss flag' using '1' and 0.(x is odd and bigger than 4) Example x=5 ans = [1 1 1 1 ...

18 days ago

Solved

Gallery function, learning

write a Function, edit something or Add something that give us like the following for random n: n=2 ans= [ 0 1 ...

20 days ago

Solved

Minimum jumps to reach end of the array

Given an array of integers where each element represents the max number of steps that can be made forward from that element. Ste...

20 days ago

Solved

Roman numbers: how old is that building?

The front of old buildings sometimes show the year when they were built in roman numbers. These number are rather confusing and ...

22 days ago

Solved

List the nth prime quartet prefix

Prime numbers larger than 5 can end only in 1, 3, 7, or 9, but of course not all numbers ending in these four digits are prime. ...

23 days ago

Solved

Peg Solitaire - Apply Move

About Peg Solitaire . Previous Problem. Consider inital board; If we move the peg located on (4,6) to the left (4) directio...

26 days ago

Solved

create a function that give us like the following

x=3 y= [1 -1 -1 0 1 -1 0 0 1]; -------------------------------- x=5 y= [ 1 -1 -...

26 days ago

Solved

Peg Solitaire - Get Possible Moves

About Peg Solitaire. Consider following initial board; (1) indicates there is a peg and (0) indicates empty holes. For thi...

26 days ago

Solved

Convert Thermocouple output voltage (in mV) to Temperature (in C)

Convert Thermocouples of types (B,E,J,K,N,R,S,T) output junction voltage (in mV) to temperature (in C) using NIST coefficients r...

27 days ago

Solved

MATLAB Basics: Complex Argument

For a given complex number, x, return the argument, y, in degrees.

28 days ago

Solved

MATLAB Basics: Complex Conjugates

For a given complex number, x, return the complex conjugate, y.

28 days ago

Solved

Compute the sum of reciprocals of quadratics

Write a function to compute the following sum: See also Cody Problem 46000.

28 days ago

Solved

Compute the fractional derivative

Cody Problem 1370 asks us to compute the derivative of a polynomial. This problem extends that idea to fractional derivatives, w...

29 days ago

Solved

Pick the die most likely to win

After discussing Rock, Paper, Scissors, Lizard, Spock in The Simpsons and their Mathematical Secrets, Simon Singh writes that in...

29 days ago

Solved

MATLAB Basics: Complex Numbers

For a given complex number, x, return the real and imaginary parts as a vector, y = [Real Imaginary].

1 month ago