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Extend the digamma function to negative arguments
While solving one of Ramon Villamangca’s problems, I needed the value of , where is the digamma function. However, MATLAB’s fun...

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List Ormiston prime pairs
The numbers 1913 and 1931 form the first Ormiston prime pair. The numbers are consecutive primes, and they are anagrams of each ...

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Moyenne pondérée
Ecrire une fonction qui prend en entrée un vecteur P et un vecteur V et calcule la moyenne pondérée MP des élements vi d'un vec...

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Special matrix
Make a square matrix with this shape. For n=4 M = 1 1 0 0 1 0 1 0 0 1 0 ...

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Explore the twin prime Goldbach conjecture
The Goldbach conjecture says that every positive even integer greater than 2 can be expressed as the sum of two prime numbers in...

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Write a code to implement Euler's method to integrate a simple function
Euler's method approximates the solution to a differential equation as where . The challenge is to write a code that can take...

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Given the mass and stiffness of an undamped SDOF system, find the natural frequency and the natural period of vibration
Problem Statement Given the mass and stiffness of an undamped SDOF system, find the system's natural frequency in both Hz and...

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Juros Simples
Faça uma função que calcule o montagem de um investimento com juros simples que receba como argumentos o capital inicial C, a ta...

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String Logic 18
Examples: 'DIG' --> 'DG' 'IMPORTANT' --> 'IPRAT' 'DEAL' --> 'DA' 'LIMB' --> 'LM' 'MOSTLY' --> 'MSL'

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Day counter function
Write a function called day_counter that returns the number of Mondays that fell on the first day of the month in a given year b...

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Flip the vector from right to left
Flip the vector from right to left. Examples x=[1:5], then y=[5 4 3 2 1] x=[1 4 6], then y=[6 4 1]; Request not to use d...

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GJam 2017 Kickstart: Parentheses (Large)
This Challenge is derived from <http://code.google.com/codejam/contest/6304486/dashboard#s=p2 GJam 2017 Kickstart Parentheses>. ...

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Independent direction vectors of a plane
Given the equation of a plan of the form ax+by+cz=d, return 2 independent direction vectors which could e.g. be used to determin...

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Palindrome Checker
Check to see if a given string is a palindrome (a word, phrase, or sequence that reads the same backward as forward). Output sh...

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Sum All Positive Elements
Output a scalar that is equal to the sum of all positive elements in a given vector/matrix. For Example: The sum of all positi...

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Reverse a string
Return a string with the characters in reverse order from a given input string Ex: my_str = "Ciao" function should output "...

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Diagonal Product of A Square Matrix
For a matrix A, calculate the product of its diagonal elements. * Assume all input matrices are square & corresponding element...

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Calculate the mean of each half of a matrix
Given a matrix with an even number of columns, n, return a 1-by-2 row vector where the first element is the mean of all the elem...

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Calculate Amount of Cake Frosting
Given two input variables r and h, which stand for the radius and height of a cake, calculate the surface area of the cake you n...

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Compute a sum
Write a function to compute the following sum Although a solution is available for general values of the coefficients, the co...

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The Prime Days of Christmas
On the first day of Christmas my true love sent to me partridges in a pear tree. On the second day of Christmas my true love s...

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Conditional transpose II
As in problem 60734, you're given two vectors, x and y, which might be row or a column vectors. Your task is to ensure that y ha...

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Conditional transpose
You're given two vectors of the same length, x and y, which might be row or a column vectors. Your task is to ensure that y has ...

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Remove the diagonal of a square matrix
Some Cody problems ask solvers to remove columns (e.g., CP 7), and others ask solvers to remove rows (e.g., CP 44033). Write a...

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Find the closest geyser prime
My wife and I celebrated our honeymoon and our recent anniversary in Yellowstone and Grand Teton National Parks. After returning...

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Sum the reciprocals of polygonal numbers
As explained in Cody Problem 60571, a polygonal number is the number of dots arranged in the shape of a regular polygon. For exa...

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Complete a 2nd order difference sequence
In Cody Problem 59791 ChrisR asks us to find the integer that completes a randomly sorted geometric sequence with one missing el...

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Pronounce digits
Given a number num, select the first d decimal places and pronounce the digits (in English). The function returns the pronunciat...

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Remove Adjacent Pairs
Given an array of integers where adjacent elements may be identical, your task is to remove these adjacent pairs. If removing on...

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List primes of the form xy+z
Consider three consecutive integers , , and . When is the number prime? For example, if or , then the results are 17 and 37, ...

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