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Word Distance - Sum
Let's suppose that the distance of a word can be calculated by summing the differences between its letters, having assigned the ...

3 years ago

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Easy Sequences 2: Trigonometric function with integral input and output
The function 'F', defined as: , will always return an integer if the input is a natural number (in radian...

3 years ago

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Easy Sequences 1: Find the index of an element
The nth element of a series is defined by: . Obviously, the first element . Given the nth element , find the value of the corre...

3 years ago

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Convert ColorSpec string to RGB triplet
Given a ColorSpec string, either in short or long form, return the corresponding RGB triplet. If the input is not a valid color,...

3 years ago

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Convert this color - RGB Vector to Hex String
Given a 3 element RGB vector corresponding to a color (given by the MATLAB color spec <http://www.mathworks.com/help/matlab/ref/...

3 years ago

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Convert hex color specification to MATLAB RGB
Here's something that comes up all the time if you deal with web pages. Given a <http://www.w3schools.com/html/html_colors.as...

3 years ago

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Calculate Euler's phi function
Compute the Euler's phi function of a large integer. For more information about this topic please visit: <https://en.wikiped...

3 years ago

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Rosenbrock's Banana Function and its derivatives
Write a function to return the value of <http://en.wikipedia.org/wiki/Rosenbrock_function Rosenbrock's two-dimensional banana fu...

3 years ago

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Create a dictionary
The goal is to write a function that returns a dictionary from a list of words or phrases and their definitions. Here is an exam...

3 years ago

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Prime Ladders
A <http://en.wikipedia.org/wiki/Word_ladder word ladder> transforms one word to another by means of single-letter mutations. So ...

3 years ago

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Count the peaceful queens
In a 5x5 chessboard with a queen of one color (white, say) on the perimeter, one can place 12 black queens on the board such tha...

3 years ago

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Goldbach's marginal conjecture - Write integer as sum of three primes
Goldbach's strong conjecture states that every even integer greater than 2 can be expressed as the sum of two primes. For exampl...

3 years ago

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Twin Primes
Twin primes are pairs of primes that are immediately next to each other (difference of two). The lesser of twin primes are 3, 5,...

3 years ago

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Compare two strings.
Compare two strings, whether they are equal or not.

3 years ago

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Create tangent function out of sine function only
Please don't use cosine and tangent functions

3 years ago

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Create tangent function out of cosine only
Please don't use tangent and sine functions

3 years ago

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Vectorizing, too easy or too hard?
Please insert a . before any ^, * or / in the string. That's it!!

3 years ago

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edge detection
write a function that gives the indexes of rising or falling edge x is a vector (assume it contains always at least one eleme...

3 years ago

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Integrate Me
Given polynomial, output the integral (with k = 1 for simplicity purposes) Example: input = [2 1] % 2x+1 output = [1 1 1]...

3 years ago

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Back to basics 20 - singleton dimensions
Covering some basic topics I haven't seen elsewhere on Cody. Remove the singleton dimensions from the input variable (e.g. if...

3 years ago

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Create sine function out of cosine
Please don't use sin(x) directly

3 years ago

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Volume of a sphere given its surface area
You just measured its surface area, that is the input.

3 years ago

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Create cosine function out of sine
Please dont use cos(x) directly

3 years ago

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Special Relativity 101.
Special relativity states that the effective mass of an object varies as a function of its velocity. If *c* is the speed of ligh...

3 years ago

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Determinant of a 3x3 Matrix
Return the determinant of a 3x3 matrix. The built-in Matlab function det is not allowed.

3 years ago

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Number of vertices of a hypercube
Return the number of vertices of a n-dimensional hypercube.

3 years ago

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Change the sign
Given a matrix x, return one with each diagonal element replaced by its absolute value and the largest element in absolute value...

3 years ago

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OXO counting
Count the number of occurrences of "OXO" in rows, columns, diagonals and anti-diagonals. Example: >> board = ['OOX' ...

3 years ago

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Twins in a Window
<http://en.wikipedia.org/wiki/Twin_primes Twin primes> are prime numbers that differ by 2, such as [11,13] or [41,43]. Write a f...

3 years ago

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Periodic Table 101.
Given the atomic number (z), answer the symbol for that particular element of the <http://en.wikipedia.org/wiki/Periodic_table/ ...

3 years ago