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Eliminate unnecessary polygon vertices
Suppose you have an n-point polygon represented as an n-by-2 matrix of polygon vertices, P. Assume that the polygon is closed; t...

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Pull the variable y_correct from the Caller's Workspace
*Description* This highlights a very easy to use and high-scoring cheat that can be used on almost all Cody questions.

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How many monitors are connected ?
How to obtain the numbers of monitors connected to your computer ?

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Permute diagonal and antidiagonal
Permute diagonal and antidiagonal For example [1 2 3;4 5 6;7 8 9] -> [3 2 1;4 5 6;9 8 7] WITHOUT diag function (and variable n...

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Column norms of a matrix
Given a matrix M, return a vector y such that for each k y(k)=norm(M(:,k)) (y(k) is the Euclidean norm of the k-th col...

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Specific toolboxes
Given a string that is the name of a MATLAB toolbox, return true if it is available on the Cody solvers evaluation system, false...

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the return of the hackathon
You might have found a solution to our <http://www.mathworks.com/matlabcentral/cody/problems/205-hackathon-the-beginnings previo...

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Reindex a vector
You are given two vectors of equal length. Vector N has numeric values (no Inf or NaN) while vector IDX has integers. Place th...

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Numbers with prime factors 2, 3 and 5.
Make a function which takes one positive integer n and returns a matrix with the numbers of the form (2^i)*(3^j)*(5^k) which are...

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Back to basics 24 - Symbolic variables
Covering some basic topics I haven't seen elsewhere on Cody. Given a string algebraic expression, return the symbolic variabl...

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letter yes yes & letter no no
Split a string into two strings, first string has all alphabetic letters, next string has all the rest, keep the order please, o...

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peta to nano (x-ray)
for certain x-ray radiation, given frequency in petahertz, give wavelength in nanometer, must be accurate +/- 25%

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Getting logical indexes
This is a basic MATLAB operation. It is for instructional purposes. --- Logical indexing works like this. thresh = 4...

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Calculate the Hamming distance between two strings
Inspired by a similar Cody problem found <http://www.mathworks.com/matlabcentral/cody/problems/93-calculate-the-levenshtein-dist...

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Implement Solitaire cipher for N long deck.
Implement the <http://en.wikipedia.org/wiki/Solitaire_(cipher) solitaire cypher>. Given a starting permutation of numbers [1:...

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Poker Series 01: isStraightFlush
The Poker Series consists of many short, well defined functions that when combined will lead to complex behavior. Our goal is t...

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Matrix with different incremental runs
Given a vector of positive integers a (>=0); How does one create the matrix where the ith column contains the vector 1:a(i) poss...

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Solitaire Cipher
Implement the <http://en.wikipedia.org/wiki/Solitaire_(cipher) solitaire cipher>. Since this is from Wikipedia, I am capturin...

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How long is the longest prime diagonal?
Stanislaw Ulam once observed that if the counting numbers are <http://en.wikipedia.org/wiki/Ulam_spiral arranged in a spiral>, t...

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Spot the outlier
All points except for one lie on a line. Which one is the outlier? Example: You are given a list of x-y pairs in a column ...

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Convert single-precision floating-point number to binary representation
Write a function which takes a scalar <http://en.wikipedia.org/wiki/Single-precision_floating-point_format single-precision floa...

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Find third Side of a right triangle given hypotenuse and a side. No * - or other functions allowed
Find the remaining side of a triangle given the hypotenuse and a side. However, the normal functions and symbols are not allowe...

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Solve Quadratic : No * - or key functions permitted
Solve the quadratic equation *ax^2+bx+c=0*. However, some of the normal functions and symbols are not allowed. x=[ -b +/- sq...

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Check if number exists in vector
Return 1 if number _a_ exists in vector _b_ otherwise return 0. a = 3; b = [1,2,4]; Returns 0. a = 3; b = [1,...

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Are you in or are you out?
Given vertices specified by the vectors xv and yv, and a single point specified by the numbers X and Y, return "true" if the poi...

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Angle of triangle
For three unknown points a b c, given three sides ab bc ca, find three angles abc bca cab in radians. Your function should b...

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System of equations
Find a solution to a system of equations represented by a |n| by |n+1| matrix. For instance, [ 2 0 4; => 2*x = 4 ...

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Find indices of multiple minima in a vector
I have a vector, say: x= [ 1 5 6 2 6 1 3 5 1] Now I would like to get the index of the minimum values in this vector. When...

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Back to basics 18 - justification
Covering some basic topics I haven't seen elsewhere on Cody. Given a string with extra spaces in front and/or in back, return...

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First non-zero element in each column
For a given matrix, calculate the index of the first non-zero element in each column. Assuming a column with all elements zero ...

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