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Can you beat the lottery again (for hardcore coder) ?
Inspired by the Problem 1713 by Chris E. Here is the code that generates the first lottery number: rng('shuffle'); numb...

2 months ago

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Number of active Cody players by date
I'm looking to start a series of problems related to web scraping. In this problem, you are given a date in 'dd mmm yyyy' format...

2 months ago

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List of built-in demo images
Return a cell array containing the filenames for built-in images (e.g. cameraman.tif, coins.png). An optional input specifies wh...

2 months ago

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Find the maximal cliques in an undirected graph
This is a variant of a <http://www.mathworks.com/matlabcentral/cody/problems/2646-determine-the-number-of-maximal-cliques-in-an-...

2 months ago

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Determine the number of maximal cliques in an undirected graph
In an undirected graph, a clique is a subset of vertices that are fully connected, i.e. there is an edge between all pairs of ve...

2 months ago

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Find similar/related functions
The help function can be useful for getting quick assistance on a particular function. For most built-in MATLAB functions, a por...

2 months ago

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Construct a precedence graph from a code segment
A hypothetical MATLAB code segment containing n lines is given in the form of a cell array. The i-th cell contains the i-th line...

2 months ago

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Text Processing - New
Derived from problem 2440. A string containing several sentences are given as input. If any sentence contains the word 'great...

2 months ago

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self description 2.0
New (and way easier) hacking problem built upon <http://www.mathworks.com/matlabcentral/cody/problems/1969 Alfonso's problem 196...

2 months ago

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Graph Algorithms - 2 : Chromatic Number
Chromatic number of a graph is the minimum number of distinct colors required to color all the vertices of the graph such that n...

2 months ago

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Signal Processing Basic - 1. Stretch a signal
Input vector V is a discrete time signal assuming the first sample is sampled at t=0. This signal has to be stretched in time. ...

2 months ago

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Graph Algorithms - 1 : Length of the largest closed path
An undirected simple graph is given as the form of an adjacency matrix. Find the length of the largest closed path (one that sta...

2 months ago

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Beam me up, Scotty!
It's the mid 22nd century. You, Montgomery Scott, are appointed the chief engineer of the Starship Enterprise. The Starship is...

2 months 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 ...

2 months ago

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Sequence Vectorization - II
This is the second part to the question - Sequence Vectorization - I Given an array of Natural numbers, N, return the sequence ...

2 months ago

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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...

2 months 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...

2 months ago

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Repeatitive Summation
Given numeric vectors x, a and b, perform the following operation - a represents a vector of numbers and b represents a vector ...

2 months ago

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Cluster Partition
Given an array (row or column) of numbers, divide the array into consecutive positive/negative numbers. 0 is to be treated inde...

2 months ago

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Canadian Conundrum
After succesfully completing the French Conundrum, you have decided to take a vacation. Your trip is amongst the mighty mountai...

2 months ago

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French Conundrum
The French army is trapped, sorrounded in backwards direction (South and West directions) by enemy traps and ambushes. You are n...

2 months ago

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Sub-Diagonal Sum
Given a (m x n) matrix and a value r {1,-1}, change every element to the sum of the diagonal led by the element. r=1 > regular ...

2 months ago

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Magical Land
Mother Earth has gifted humanity a magical land to help all life on earth, in the shape of a n-sided regular polygon. You, bein...

2 months ago

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Find the standard deviation of non-zero elements in a matrix
Given a matrix A, calculate the sample standard deviation of only the non-zero elements. If there are fewer than 2 non-zero ...

2 months ago

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Parametric Array
Create a row vector, 1xN (Integer, >1), such that the mean of the vector is M (Real number) and the standard deviation of the ...

3 months ago

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Scorer's Function
Evaluate the Scorer's function for a given input. The expected output is Gi(x). Note - The precision will vary for test cases...

3 months ago

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Local Extrema
Given a 2D (m,n>1) matrix, replace an element if it is not a local extrema (minima/maxima), with 0 (zero). The comparison crite...

3 months ago

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Hyperperfect Numbers
A k-hyperperfect number is a natural number n for which the equality n = 1 + k(σ(n) − n − 1) holds, where σ(n) is the divisor ...

3 months ago

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Leyland Primes
A Leyland Number is defined as a number of the form - x^y + y^x, or, x^y - y^x (x,y)>1 Given an array of numbers(>1), check...

3 months ago

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Factor Digits
Check if a given number in an array of numbers is - Equidigital Number - A number that has the same number of digits as the num...

3 months ago