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William


Last seen: Today Active since 2012

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

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Easy Sequences 64: Base-14 Arithmetic Function
For an integer , the base-14 arithmetic function, , is defined as follows: Convert to base-14, using the letters '' for digits...

2 dagar ago

Solved


Wordle
Wordle is an english game where you need to guess a 5 letter word. For each guess you'll receive a feedback for the placement of...

5 dagar ago

Solved


Time reverse indices
Time reverse the index values as follows IndexIn = [7 1 0] IndexOut = [7 6 0] Note that the indices are zero based and so...

6 dagar ago

Solved


Easy Sequences 66: Fractional Part of Sum of Consecutive Powers over a Prime
Given three postive integers, , and , create the function , defined as follows: Where is the th prime and the s...

6 dagar ago

Solved


Sum of two number using (regexp, varargin) comand?
Sum two number a &b and get there result in c using the rexp and varargin comand.

7 dagar ago

Solved


Backgammon #5 - Valid Move?
A previous problem in this occasional series (Problem 45967) set up a possible representation of a backgammon board: White ston...

8 dagar ago

Solved


List the dopey numbers
If vile numbers have binary representations that end with an even number of zeros (even vile), then numbers with binary represe...

8 dagar ago

Solved


Basic: fft
Calculate the value using fft

9 dagar ago

Solved


Find a Prime Number
Find a prime number from a vector Example: [2 51 8 65 19] a = 51

10 dagar ago

Solved


List the vile numbers
Evil numbers, the subject of Cody Problem 2733 have an even number of ones in their binary representations, whereas odious numbe...

10 dagar ago

Solved


Easy Sequences 32: Almost Pythagorean Triples
An Almost Pythagorean Triple (abbreviated as "APT'), is a set of 3 integers in which square of the largest element, which we wil...

11 dagar ago

Solved


Multiply 2 Numbers
Multiply a * b a = 80 & b = 90

11 dagar ago

Solved


List the Beatriz numbers
Write a function to find integers less than or equal to an input value that solve the equation . The function gives the sum o...

11 dagar ago

Solved


Backgammon #4 - Dice Probabilities
Previous problems in this series have looked at how a backgammon board might be represented, and board positions manipulated and...

13 dagar ago

Solved


Backgammon #3 - Display a Board Position
A previous problem in this occasional series (Problem 45967) set up a possible representation of a backgammon board: White ston...

14 dagar ago

Solved


Maximum number of decimal places in a set of numbers
Given a vector or matrix of values, calculate the maximum number of decimal places within the input. Trailing zeros do not count...

15 dagar ago

Solved


Draw 'P' !!!
Draw a n by n matrix 'P' using 0s and 1s. (n is odd and greater than 4) if n=5 , then the output will be [1 1 1 1 1 1 0 0 0...

16 dagar ago

Solved


Find the summation, mean, median, mode and standard deviation of a given array.
An array is given. Find out the summation, mean, median, mode and standard deviation of a given array. If x=[1,2,2,3,3,3,4,4,4,...

17 dagar ago

Solved


Is A matrix the inverse of B matrix ?
Given a matrix A and a matrix B, is A the inverse of B? >>A=[2,4;3,5]; >>B=[-2.5,2;1.5,-1]; >>isInverse(A,B) ans = 1

17 dagar ago

Solved


Backgammon - Your turn!
A previous problem in this occasional series (Problem 45967) set up a possible representation of a backgammon board: White ston...

19 dagar ago

Solved


Easy Sequences 62: Sum of Omega-3 Function
For an integer , the prime big omega function, , is defined as the total number of prime factors of . If , since , therefore . ...

19 dagar ago

Solved


Total resistance of a network of resistors in series and parallel
What is the total resistance of a network of resistors in series and in parallel? A matrix R contains the resistances (in Ohm) ...

19 dagar ago

Solved


Total resistance of resistors in parallel
What is the total resistance of a number of resistors in parallel? A vector R contains the resistances (in Ohm) of n resistors,...

19 dagar ago

Solved


Total resistance of resistors in series
What is the total resistance of a number of resistors in series? A vector R contains the resistances (in Ohm) of n resistors, w...

19 dagar ago

Solved


SatCom #10: Rate of Precesion of Orbit Plane (Nodal Precession)
Satellite and Space Engineering - Problem #10 This is part of a series of problems looking at topics in satellite and space com...

21 dagar ago

Solved


SatCom #9: Overall Link Performance
Satellite and Space Engineering - Problem #9 This is part of a series of problems looking at topics in satellite and space comm...

21 dagar ago

Solved


SatCom #8: Satellite Link Budget
Satellite and Space Engineering - Problem #8 This is part of a series of problems looking at topics in satellite and space comm...

21 dagar ago

Solved


Easy Sequences 59: Almost Twin Primes
A positive integer pair , is called an "almost twin prime pair", if one of the pair is a prime and the other is either a prime o...

29 dagar ago

Solved


Easy Sequences 58: Curious Prime-Rational Functions
For some prime numbers and where , a rational function , is defined as follows: . Using the output , another rational functi...

ungefär en månad ago

Solved


Easy Sequences 56: Counting "Ugly" Numbers
A positive integer is called a regular number, if and only if there exist a non-negative integer , such that . For some reason...

ungefär en månad ago

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