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Compute the Sisyphus sequence
A recent article in the New York Times featured the Online Encyclopedia of Integer Sequences, founded by Neil J.A. Sloane. One o...

9 maanden ago

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Find the altitudes of a triangle
Write a function that takes the x- and y-coordinates of three points describing the vertices of a triangle and returns the coord...

9 maanden ago

Solved

Classify water surface profiles
Problem statement Write a function to classify the water surface profile starting at depth in a channel with longitudinal slop...

9 maanden ago

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Continuous NaNs - I
Remove any continuous NaNs that appear in the array - %Example 1 input = [1 NaN 2 NaN NaN 3 NaN NaN NaN] output = [1 NaN 2 ...

10 maanden ago

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Compute the critical depth of a channel
Problem statement Write a function to compute the critical depth of a channel with discharge . The unit system will be specifie...

10 maanden ago

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Compute the normal depth of a channel
For steady uniform flow in a channel of constant cross section and slope, the depth does not change with distance or time. In th...

10 maanden ago

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Calculate the volume of the intersection of two balls
Consider two balls (solid spheres) in , with radius and respectively. Suppose that the distance between the centers of the two...

10 maanden ago

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Easy Sequences 112: Almost Golden Integer Rectangles 1
A golden rectangle is a rectangle whose side lengths are in the golden ratio, , where: . ...

10 maanden ago

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Sign of IEEE Single
Output the sign bit of the IEEE representation of the single-typed 32-bit float input as the uint8 "1" or the uint8 "0".

10 maanden ago

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Draw '5' in Chinese.
Draw a x-by-x matrix '五' using 1s and 0s. Example: x=5 ans= [1 1 1 1 1 0 1 0 0 0 1 1 1 1 0 0 1 0 1 0 1 1 1 1 1] x=7...

10 maanden ago

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Create an empty array
Suppose you need an empty array. e = [] will give you one, but it's a double array, which may not help if you need a differen...

10 maanden ago

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Integrate a product of gamma functions
Write a function to compute the following integral: where and is the gamma function, the subject of Cody Problem 46025.

11 maanden ago

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Determine whether a number is prome
In discussing the unique factorization of numbers in Elementary Number Theory, Underwood Dudley devised a new number system: “C...

11 maanden ago

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Remove runs of at least n consecutive NaNs
This problem is inspired by Dyuman Joshi's problem 58329. Given a row vector x and a natural number n, remove all runs of at lea...

11 maanden ago

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List numbers that cannot be expressed as the sum of fewer than four squares
Lagrange proved that all positive integers can be expressed as the sum of four squares. For example, 27 = 16 + 9 + 1 + 1. Howeve...

11 maanden ago

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Find the circle inscribed in a triangle
Write a function that takes the x- and y-coordinates of three points describing the vertices of a triangle and returns the cente...

11 maanden ago

Solved

Sequence Vectorization - I
Given a Natural number N, return the sequence - [1 1 2 1 2 3 1 2 3 4 ... 1 2 3 ... N-3 N-2 N-1 N] i.e. the horizontal concatenat...

ongeveer een jaar ago

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List numbers such that every sum of consecutive positive integers ending in those numbers is composite
The sequence in question in this problem involves numbers such that all sums of consecutive positive integers ending with are ...

ongeveer een jaar ago

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List the two-bit primes
Each year at Christmas, my father-in-law and his partner send me the Puzzle Mania section from the New York Times. This year’s e...

ongeveer een jaar ago

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Inscribe a circle in a triangle with a side of length equal to the circle’s circumference
A circle of radius is inscribed in a triangle with a side that has a length equal to the circle’s circumference. The center of ...

ongeveer een jaar ago

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Easy Sequences 94: GCD Sums
Given positive integer , write the function gSum(x), that sums all the GCD's of the integer pairs . For example in the Excel scr...

ongeveer een jaar ago

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The Yellowstone Permutation
The Yellowstone Permutation is a sequence of positive integers, defined by the following rules: No term is repeated. Given n t...

ongeveer een jaar ago

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Solve an equation involving primes and fractions
Write a function to find pairs of primes and satisfying the equation where is an integer. The function should take a numbe...

ongeveer een jaar ago

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Compute frequency factors for the normal distribution
In frequency analysis in hydrology, the streamflow corresponding to a specified exceedance probability (or return period ) can...

ongeveer een jaar ago

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Determine flows of given probability using empirical frequency analysis
Write a function that takes as input observations of peak streamflow and exceedance probabilities expressed as percentages an...

ongeveer een jaar ago

Solved

Find patterns in subprime Fibonacci sequences
Lots of Cody problems involve Fibonacci and Collatz sequences. Fibonacci sequences start with two numbers, and later terms are c...

ongeveer een jaar ago

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Is this triangle right-angled (mixed sides)?
Implement function returning if triangle is right angled or not? Input argument is vector row with not ordered triangle sides. ...

ongeveer een jaar ago

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Hermite Polynomials
Problem 1304 deals with Hermite polynomial of the physicist's type. In this problem, Return the n-th Hermite polynomial of the ...

ongeveer een jaar ago

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About jokes (and compression)
An argument can be made about jokes. The shorter they are, the funnier. Further explained here: https://en.wikipedia.org/wiki/Hu...

ongeveer een jaar ago

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Counting Permutations
In the permutations of the numbers 1 to n, count the number of permutations in which exactly m elements are greater than the pre...

ongeveer een jaar ago