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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...

9 years ago

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find the roots of a quadratic equation
for e.g x = [ 2 -1 -3] y = [1.5 -1]

9 years ago

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Tic Tac Toe FTW
Given a tic tac toe board: * 1 represents X * 0 represents empty. * -1 represents O It is X's move. If there is an imme...

9 years ago

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Counting Sequence
Given a vector x, find the "counting sequence" y. A counting sequence is formed by "counting" the entries in a given sequence...

9 years ago

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Extract leading non-zero digit
<http://en.wikipedia.org/wiki/Benford%27s_law Benford's Law> states that the distribution of leading digits is not random. This...

9 years ago

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Area of a Square
Inside a square is a circle with radius r. What is the area of the square?

9 years ago

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middleAsColumn: Return all but first and last element as a column vector
Given input A, return all but the first and last elements, arranged as a column vector. (I.e., all dimensions after the first s...

9 years ago

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Equal to their cube
Tell me three real numbers that are equal to their cubes?

9 years ago

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Increment a number, given its digits
Take as input an array of digits (e.g. x = [1 2 3]) and output an array of digits that is that number "incremented" properly, (i...

9 years ago

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High school cafeteria
Given an input vector of positive integers, return a row vector with the primes first (in increasing order) and the composites n...

9 years ago

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Find nearest prime number less than input number
Find nearest prime number less than input number . For example: if the input number is 125, then the nearest prime number whi...

9 years ago

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First N Perfect Squares
*Description* Return the first N perfect squares *Example* input = 4; output = [ 1 4 9 16 ];

9 years ago

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Polite numbers. Politeness.
A polite number is an integer that sums of two or more consecutive positive integers. Politeness of a positive integer is a num...

9 years ago

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Smith numbers
Return true if the input is a Smith number in base ten. Otherwise, return false. Read about Smith numbers at <http://en.wikipedi...

9 years ago

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Armstrong Number
Determine whether the given input n-digit number is Armstrong Number or not. Return True if it is an Armstrong Number. An n-D...

9 years ago

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Generate N equally spaced intervals between -L and L
Given N and L, return a list of numbers (in ascending order) that divides the interval [-L L] into N equal-length segments. F...

9 years ago

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Can the given sides form a triangle?
Can the three given sides form a triangle?

9 years ago

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Make a 1 hot vector
Make a vector of length _N_ that consists of all zeros except at index _k_, where it has the value 1. Example: Input ...

9 years ago

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Angle between Two Vectors
The dot product relationship, a dot b = | a | | b | cos(theta), can be used to determine the acute angle between vector a and ve...

9 years ago

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Bottles of beer
Given an input number representing the number of bottles of beer on the wall, output how many are left if you take one down and ...

9 years ago

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N-Queens Checker
Picture a chessboard populated with a number of queens (i.e. pieces that can move like a queen in chess). The board is a matrix,...

9 years ago

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Project Euler: Problem 2, Sum of even Fibonacci
Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2, the first 10 te...

9 years ago

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Volume of this donut
Given hole diameter a, and outermost diameter b, determine the volume y of the resulting donut.

9 years ago

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Number of 1s in the Binary Representation of a Number
*Description* Return the number of 1s in the (unsigned integer) binary representation of a number. This function should be ab...

9 years ago

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Replace multiples of 5 with NaN
It is required to replace all values in a vector that are multiples of 5 with NaN. Example: input: x = [1 2 5 12 10 7] ...

9 years ago

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Balanced Ternary Numbers: Easy as |, |-, |o
This problem concerns the so-called <http://en.wikipedia.org/wiki/Balanced_ternary balanced ternary> system for representing num...

9 years ago

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Given an unsigned integer x, find the largest y by rearranging the bits in x
Given an unsigned integer x, find the largest y by rearranging the bits in x. Example: Input x = 10 Output y is 12 ...

9 years ago

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First use of arrayfun() and anonymous function @(x)
Create an anonymous function using @(x) for a parabola equation for the given coefficients stored in s with s(1)x2 + s(2)x +...

9 years ago

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Recycled Numbers (CodeJam Qualification Round 2012)
Let's say a pair of distinct positive integers ( _n_ , _m_ ) is recycled if you can obtain _m_ by moving some digits from the ...

9 years ago

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Length of a short side
Calculate the length of the short side, a, of a right-angled triangle with hypotenuse of length c, and other short side of lengt...

9 years ago