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Happy Free Wednesday!
Just submit your solution on any Wednesday. *Related Challenges:* # Happy Free Wednesday! # Happy Free 2019! # Happy Fr...

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Juego de posiciones
Crea una función que ordene vectores de tal manera que los primeros números sean negativos ordenados de menor a mayor. Y después...

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Closely related?
Given a function past_records() that will report blood sugar level of two twin brothers some random number of days ago. For exam...

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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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Area of a rectangle
FInd the area of a rectangle with a length L and width W. Round to the nearest integer.

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Convert a grayscale image into RGB colour format, preserving data type
In the Image Processing Toolbox, MATLAB provides rgb2gray to convert a 3 channel color image into a 1 channel intensity...

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Find sum of numbers on the cornice of a matrix.

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Number Puzzle - 113
Give an example of a six-digit prime number abcdef for which bcde and cd are also prime numbers.

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Définir une fonction creneau
Definr une fonction "creneau" qui prend en entrée un vecteur et renvoie la valeur 1 pour chaque élément positif du vecteur et...

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Number Puzzles - 009

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Perimeter of a quadrilateral
There are four cars starting at a point. The first car points north, the second one points east, the third one points south, an...

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Find elements of set A those are not in set B
Given two sets of data A and B. Find elements of A those are not in set B. ...

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find the 'M'
for an input x, return 1 at the location of the letter 'M'

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Replace with Lower
Given a list of integers, for each element, replace it with the minimum integer found in the sub-list to its strict right (exclu...

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Number Puzzle - 066

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Solve system of equation!
Given provided system of equation, and find x and y. System of equation can be expressed as each term's coefficient. For exam...

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Calculate the volume of the football

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Save variables
a=[1] Save variable a that is located in workspace into current folder. File name should be 'a.mat'

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Subtraction
Given two numbers a and b subtract them

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Hofstadter Q sequence
The Hofstadter Q sequence is defined as follows: The first elements of the sequence are 1, 1, 2, 3, 3, 4, 5, 5, 6, 6. Write ...

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Calculate the structural rank of a 2-by-4 matrix.

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Neural Net Image Convolution: Return only Valid portion of conv2
This challenge is to return only the Valid portion of a 2-D convolution. Valid is deemed to be where all elements of the kernel ...

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Breaking up a chocolate bar
You've got a chocolate bar of size , and you want to break it up into bite-sized () pieces. How many steps are required to do th...

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Greater than before
Given an array of integers, write a function that returns elements that are greater than the one before them. For instance, ...

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Find the summation of factorial series
Factorial numbers are n! = 1*2*3....*n the series is 1!, 2!, 3!,........, n!

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Homemade: Control Charts
This problem is a simple version of control charts in statistics. Intput consists from 30 or more observations. * Upper limi...

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Sort vector by number of prime factors of each element
Sort a given array based on how many prime factors each term has. Sort from least to greatest and output original values. Ex: ...

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Tridiagonal matrix
Given vectors u and v, make a tri-diagonal symmetric matrix such that u is in the main diagonal and v is below and above diagona...

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Quadratic equation
given three inputs (a, b, c) for the equation a*x^2+b*x+c=0; return 1 if the roots are complex (non zero imaginary), and 0 if th...

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Find the mean of the magic x
Given a x term, find the magic x, then find the mean/average of any one row or column.

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