# William

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

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**Content Feed**

Solved

Multiply binary numbers

Write a function to multiply two binary numbers input as strings. For example, input values of ‘1011’ and ‘101’ should give ’110...

2 days ago

Solved

Easy Sequences 19: Length of Prime-sided Rectangle with Maximum Area

A prime-sided rectangle is a rectangle having sides represented by prime numbers. The figure below shows all the possible prime-...

2 days ago

Solved

The perimeter of a circle

Calculate the perimeter of a circle E.g If input r(radius) = 2 , the output( the perimeter of a circle) = 12.5664.

5 days ago

Solved

Easy Sequences 18: Set Bits of Triple Summations

The function S(n) is defined by the following triple summations: The double brackets mean that th...

6 days ago

Solved

Easy Sequences 16: Volume of Embedded Octahedron

An octahedron (not regular) is formed by joining the centers of the faces of a rectangular parallelepiped (see below figure). ...

7 days ago

Solved

Easy Sequences 15: Pythagorean Area with maximum Hypotenuse

A pythagorean triangle is defined as a right triangle with all three sides having integer lengths. Examples of pythogorean trian...

9 days ago

Solved

Easy Sequences 13: Average Speed of Spaceship

A certain alien spaceship is capable of traveling at extremely high velocities and is able to change speed instantaneously. The ...

11 days ago

Solved

Number of bytes required to store a sparse matrix

The input is always a sparse matrix : x = sparse(100,1000,0.01); >>whos x shows that 8024 bytes ares required . The a...

11 days ago

Solved

Count the primes in Collatz sequences

Several Cody problems (21, 69, 42937, 44448, 44784, 52422) involve Collatz sequences. These start with a seed . If is odd, the ...

11 days ago

Solved

List the Moran numbers

The quotient of a Moran number and its digit sum is prime. For example, 117 and 481 are Moran numbers because 117/(1+1+7) is 13 ...

12 days ago

Solved

Convert a cell-array of values to MATLAB source code

The MATLAB interpreter loads your code and executes it using the Read-Evaluate-Print-Loop (see REPL). In this problem you will ...

14 days ago

Solved

Modify subscripts

MATLAB supports object-oriented programming. Let's take an advantage of it in cody. This problem starts <http://uk.mathworks....

15 days ago

Solved

List modest numbers up to n

After determining the nude numbers, or the numbers that openly display some of their divisors as their digits, one would think t...

18 days ago

Solved

Count the ways to draw non-intersecting chords between points on a circle

There are 9 ways to draw non-intersecting chords between four points on the perimeter of a circle (including no chords at all). ...

20 days ago

Solved

Determine whether a number is unprimeable

The number 204 is unprimeable because no single digit can be changed to make it prime. In contrast, the number 207 is not unprim...

20 days ago

Solved

Determine whether a number is a fibodiv number

The number 14 is a fibodiv number because you can divide it into 1 and 4, use those numbers as the seeds for a Fibonacci sequenc...

21 days ago

Solved

Borderline Connectivity

Compute the connected components of pixel borders. Suppose that h and v together describe a logical labeling of the borders b...

21 days ago

Solved

Find the nth nude number

The number 672 is a nude number because it openly displays three of its divisors: 6, 7, and 2. In other words, a nude number is ...

24 days ago

Solved

Metamorphosis

Inspired by problem <http://www.mathworks.com/matlabcentral/cody/problems/866-community-problem-500 866>. Can you make your c...

25 days ago

Solved

Easy Sequences 11: Factorial Digits without Trailing Zeros

Here is an easy one... It is not difficult to count the number of digits of the factorial of a given number. For example for 'n...

26 days ago

Solved

Easy Sequences 10: Sum of Cumsums of Fibonacci Sequence

The function F(n) is defined as the set of Fibonacci numbers from the first up to the n-th. S(n) is the result of applying to F,...

26 days ago

Solved

Easy Sequences 9: Faithful Pairs

A "faithful number" is a non-prime number that is one less or one more than some prime number but not both. For example, for num...

27 days ago

Solved

Circular Segment Area

Let us consider a circle with radius . If we draw an angle (in radians) from the center of the circle, the two radii forming th...

27 days ago

Solved

Easy Sequences 8: Triangles with integer sides and prime perimeters

The triangle below is special. It has integer sides and a prime perimeter. Given an integer "n" we want to know how many t...

28 days ago

Solved

Easy Sequences 6: Coefficient sums of derivatives

Consider the polynomial function and its first-order derivative . The sums of the coefficients of P and P', are and , respecti...

1 month ago

Solved

Easy Sequences 5: Project Euler Problem 1 - Again!

We are all familiar with Project Euler Problem 1. This time let's try it on bigger multiples and larger range. Find the sum of ...

1 month ago

Solved

Project Euler: Problem 1, Multiples of 3 and 5

If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23...

1 month ago