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

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Radioisotope Thermoelectric Generator (RTG)

Given an isotope's atomic mass (in amu), half-life (in years(a) or days(d)), and average kinetic energy absorbed (of emitted dec...

5 days ago

Solved

Compute a sum involving the totient over divisors of a number

Write a function to compute the following sum: where is the totient function. The sum is computed over the divisors of (inc...

5 days ago

Solved

The Piggy Bank Problem

Given a cylindrical piggy bank with radius g and height y, return the bank's volume. [ g is first input argument.] Bonus though...

6 days ago

Solved

Compute the effective conductivity of a heterogeneous aquifer

Slow flow through soil or another porous medium follows Darcy’s law, which relates the flow of water to the gradient in piezome...

8 days ago

Solved

Nuclear Binding Energy

Compute the approximate nuclear binding energy in MeV using the least-squares fit of the semi-emirical mass formula. Round to th...

8 days ago

Solved

Identify Ruth-Aaron numbers

After Hank Aaron hit his 715th home run and passed Babe Ruth’s total of 714, Carl Pomerance noticed that the union of the prime ...

14 days ago

Answered

Bitshift cannot work on negative numbers

I believe this is happening for the following reason: The documentation states that "If A is a double array, and ASSUMEDTYPE is...

Bitshift cannot work on negative numbers

I believe this is happening for the following reason: The documentation states that "If A is a double array, and ASSUMEDTYPE is...

15 days ago | 2

Solved

Compute a sum of Ramanujan

Srinivasa Ramanujan defined the following function: Write a function to compute for various values of . See also Cody Proble...

15 days ago

Solved

Matrix convolution

A certain convolution step involves an elementwise multipication between two 3x3 matrices and taking the resulting sum of the el...

17 days ago

Solved

Matrix Indexing

Given a matrix A and scalars r,c,i, find the product of two elements, with the first element located at row r and column c (doub...

18 days ago

Solved

Row operations

Given a matrix A and scalars m and n, add the mth row to the nth row. You can assume that the values of m and n are reasonable. ...

19 days ago

Solved

Switch two elements in vector

Exchange the elements in the mth and nth positions in a given vector v. Thus, if m = 1, n= 4 and v = [23 1 4 5 10], then the res...

19 days ago

Solved

Stacking vectors into a matrix

Given a 4x1 vector a, and a 2x2 matrix b, create a matrix M in which the first 2 rows are each identical to a and the last two r...

19 days ago

Solved

Vector creation using colon operator

Create a vector y containing n uniformly spaced values between a and b, with a < b. Use the colon (:) operator.

19 days ago

Solved

Vector creation using linspace

Create a vector y containing n uniformly spaced values between a and b, with a < b. Use linspace.

19 days ago

Solved

Logarithmically spaced vector creation using logspace

Create a vector y containing n logarithmically spaced values between a and b, with a < b. Use the logspace operator.

19 days ago

Solved

Logarithmically spaced vector creation using linspace

Create a vector y containing n logarithmically spaced values between a and b, with a < b. Avoid using logspace and use the linsp...

19 days ago

Solved

Right shift an array n times with constant space.

Right shift an array n times with constant space, that is, no extra array can be used. Right shift operation: Last element com...

19 days ago

Solved

Determine the average number of rounds for the following game.

Each round a uniformly distributed random number is picked between 0 and 1. The game ends when the sum of the random numbers is ...

20 days ago

Solved

preventing a war!!

essume you are a student and your family paid a lot of money for your classes but unfortunately the online classes made you a ...

20 days ago

Solved

Find the smallest integer m such that n divides m!

Write a function that takes an integer and finds the smallest integer whose factorial is divisible by . For example, if , then...

20 days ago

Solved

Find the number of days in a given year

Given a year number (eg. 2000) as input, find how many days are there in the given year.

23 days ago

Solved

Who am I ?

Who am I ? Write any function that reveals itself under these constraints. Hint: I am combinatorial code, and I don't like stat...

27 days ago

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Solve an ODE: equation C

Write a function to solve the following ordinary differential equation: with and . The parameter is a constant. The functi...

28 days ago

Solved

Count unique orderings of vertices of a polygon

Cody Problem 2671 asks us to determine whether four points can be the corners of a rectangle. The points are not necessarily inp...

29 days ago

Solved

Sum the elements in rows of the Levine triangle

The Levine triangle starts as follows: Row 0: 2 Row 1: 1 1 Row 2: 1 2 Row 3: 1 1 2 To construct each row, r...

1 month ago

Solved

Determine when snow started

R.P. Agnew posed the following problem: It starts snowing in the morning and continues steadily throughout the day. A snowplow t...

1 month ago