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Calculate the sum of first x natural numbers
Calculate the sum of first x natural numbers for example if n=10 output =1+2+..+10=55

2 years ago

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Google Drive: MATLAB mat file download
Matlab 'mat' files are notoriously hard to email and download as they are binary files. To make a 'mat' file downloadable from ...

2 years ago

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Google Drive file download
This Challenge is to download a file from GoogleDrive given its "copylink" provided URL and a file name. GoogleDrive links fail...

2 years ago

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Optimal saving in Solow's classical growth model
Let us consider a simplified version of Solow's classical growth model. Let , , , and denote production, the capital stock, l...

2 years ago

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Easy Sequences 111: Repnums as Hypotenuse of Pythagorean Triangles
The number belongs to a class of numbers called Repunit Numbers, in which all digits are . For this problem, we'll define a s...

2 years ago

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Finding valleys
You have a vector of altitudes (units are arbitrary) and need to find the depths of all the valleys. You also need to determine ...

2 years ago

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ICFP 2022 - RoboPaint Swaps
The ICFP2023 Challenge is Jul 7-10, registraion opens late June. Updates at TwitICFP2023. These contests are insanely complicate...

2 years ago

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Compute rational expectations in a static, linear NKM model
Consider a static, linear approximation of the baseline New Keynesian macroeconomic model. This can be described by an IS equati...

2 years ago

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Recurssive serie
let the numerical serie U(n) such as U(n+1)= 0.2U(n) + 0.3U(n-1) ; U(0) = a ; U(1) = b the goal is to plot the elements of this...

2 years ago

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ICFP 2022 - Optimal RGB for a region
The ICFP2023 Challenge is Jul 7-10, registraion opens late June. Updates at TwitICFP2023. These contests are insanely complicate...

2 years ago

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ICFP 2022 - RoboPaint Image Scoring
The ICFP2023 Challenge is Jul 7-10, registraion opens late June. Updates at TwitICFP2023. These contests are insanely complicate...

2 years 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...

3 years ago

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Calculate the square root
Given an input integer x, calculate the square root without using the sqrt function.

3 years ago

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Mantissa of IEEE Single
Output the mantissa bits as a uint32 of the IEEE representation of the single-typed 32-bit float input. Store these bits in the ...

3 years 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".

3 years ago

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Easy Sequences 117: Fractional Part of Cube Roots
The fractional part function of a positive real number , denoted as , is defined as: , where , is the floor of . Thus, , and . ...

3 years 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...

3 years ago

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Minimum number of crossings in a complete graph
This problem is related to problem 58384. A complete graph may be drawn in different ways, such that the number of line crossin...

3 years ago

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Minimum number of crossings in a complete bipartite graph
This problem is related to problem 58389. A complete bipartite graph may be drawn in different ways, such that the number of li...

3 years 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.

3 years 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...

3 years ago

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

3 years 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...

3 years 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...

3 years 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...

3 years 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...

3 years ago

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Suma de Gauss
¿Cuál es la suma de los primeros enteros positivos?

3 years ago

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Decode a message encrypted with the square root of 2
Cody Problem 58299 asks you to encrypt a message by changing all letters to uppercase and randomly choosing a position of the AS...

3 years 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 ...

3 years ago

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Encrypt a message with the square root of 2
Suppose you want to encrypt the word ‘TWIN’. The ASCII codes for the four letters are 84, 87, 73, and 78. If you consider the fr...

3 years ago