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Sum of Dividend Digits
Find the smallest number that consist of only number 1's (e.g. 11111111111) which satisfy a given divisor and remainder. Then re...

5 years ago

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last n digit of a power function
Calculate the power of a given a base, exponent. Return the last n digit number. Example 1: base = 3; expo = 8; n = 3; ...

5 years ago

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Sum of digit range
Example: If A is n1, and B is n2 digit positive numbers. A*B's digit range will be [c d] (c = min & d = max). Then return ...

5 years ago

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Identify the sequence
Given a row vector, x, return 1 if it is an arithmetic series, or 2 if it is a geometric series. If it is neither, return 0. ...

5 years ago

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Britney unfolded
You have a long, narrow strip of paper. You are going to fold this strip of paper length-wise in half, than fold the folded stri...

5 years ago

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Polygon division
Given the number of vertices (or sides), n, of a planar convex polygon, return the number of ways, w, in which you can divide th...

5 years ago

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Number construction II
Given a positive integer, n, return a, b, c and d, such that 1. n = a*2^b+c*3^d 2. a, b, c and d are all positive integers...

5 years ago

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Compute Hamming distances between each pair of rows from two input matrices
For two input matrices _u_ ( _n_ x _uCols_ ) and _v_ ( _n_ x _vCols_ ) of numbers in range [0..255] (8-bit), such that each colu...

5 years ago

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Additive persistence
Inspired by Problem 2008 created by Ziko. In mathematics, the persistence of a number is the *number of times* one must apply...

5 years ago

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Number construction I
Given a positive integer, n, return a, b, c and d, such that 1. n = a*sqrt(b)+c*sqrt(d) 2. a, b, c and d are all positive ...

5 years ago

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Decimation
When dealing to the Roman Army, the term decimate meant that the entire unit would be broken up into groups of ten soldiers, and...

5 years ago

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Reference Index Number
Given a reference set R of elements (each unique but identical in type), and a list V of elements drawn from the set R, possibly...

5 years ago

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Spot the rectangle (Part 2)
This problem is related to the <http://bit-player.org/2009/the-17x17-challenge 17x17 challenge>. See also <http://www.mathworks....

5 years ago

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Matrix spiral
Make a spiral in a (n*n) matrix. The spiral has to start in the top left, and has to rotate clockwise to the center. The spiral ...

5 years ago

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Spot the rectangle
This problem is related to the <http://bit-player.org/2009/the-17x17-challenge 17x17 challenge>. Given a matrix filled with ones...

5 years ago

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"Low : High - Low : High - Turn around " -- Create a subindices vector
Let two vectors *lo* and *hi* be given. The job is to create a index vector like so idx = [lo(1):hi(1) lo(2):hi(2) ...]...

5 years ago

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Do the lines intersect?
You are given two line segments. Do they cross? Consider one segment as (x1,y1) to (x2,y2), the other segment as (x3,y3) to (...

5 years ago

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Return a list sorted by number of consecutive occurrences
Inspired by Problem 38 by Cody Team. Given a vector x, return a vector y of the values in x sorted by the number of CONSECUTIVE...

5 years ago

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Piecewise linear interpolation
Given an Mx2 vector and a row of M-1 integers, output a two column vector that linearly interpolates Y times between each succes...

5 years ago

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Put two time series onto the same time basis
Use interpolation to align two time series onto the same time vector. This is a problem that comes up in <http://www.mathwork...

5 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...

5 years ago

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Sum Rows
Sum the same indexed (unique) rows. Examine the test suite. Related Challenge - <http://www.mathworks.com/matlabcentral/cody/...

5 years ago

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Return the sequence element I
Given a positive integer, x, return a positive integer, y, which is the xth term in the sequence [1 2 2 3 3 3...], in which one ...

5 years ago

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Number construction III
Given a positive integer, n, return a, b and c, such that 1. n = a^1.5+b^2.5+c^3.5 2. a, b and c are all positive integers...

5 years ago

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Write c^3 as sum of two squares a^2+b^2
write c^3 as sum of two squares a^2+b^2. a and b must be integer and greater than zero. For example 5^3 = 2^2 + 11^2 5...

5 years ago

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Equidistant numbers containing certain value in an interval
Given a lower and upper bound of an interval, distance between numbers, and one particular number from that interval, create an ...

5 years ago

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Can't wait for NewYear ball drop !
Given an input string of the form 'yyyy-mm-dd' or 'yyyy-mm-dd hh:mm:ss', return a string message indicating how many days, hours...

5 years ago

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Lah Numbers
Create a square lower diagonal matrix containing the first n Lah number coefficients. In mathematics, the Lah numbers are coeffi...

5 years ago

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Average valid values of arrays
Given a 1D array (column or row vector), compute the average of valid values. Valid values are defined via two thresholds: minVa...

5 years ago

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Make a checkerboard matrix (★★★★★)
(copy of Prob. 4) Given an integer n, make an n-by-n matrix made up of alternating ones and zeros as shown below. The a(1...

5 years ago

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