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Numbers spiral diagonals (Part 1)
Inspired by Project Euler n°28 et 58. A n x n spiral matrix is obtained by starting with the number 1 and moving to the right...

11年以上前

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Red tracking Object Help
The code works perfectly for pure red extract.I have a problem with the colour.I need it to be different. % Get the snapsho...

11年以上前

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counting groups!
This problem is about counting groups. Example If you have x: x = [0.8 0.8 0.8 0.3 0.3 0.4 0.5 0.6 0.6 0.9] then a...

11年以上前

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Possible Outcomes of American Roulette
The payout for American roulette can be calculated by: payout = (38/n)-1 where n is the number of squares the bet covers. ...

11年以上前

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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...

11年以上前

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Number Persistence
A number's persistence is the number of steps required to reduce it to a single digit by multiplying all its digits to obtain a ...

11年以上前

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Cumulative difference
Given an array, return the cumulative difference. Example a = [ 1 3 5 7 ] cumdiff = [ 1 2 1 -2 ]

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Local Minima
Given a vector of data x, find the values of local minimum that is smaller than its neighbor elements. For example, if x =...

11年以上前

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Create incremental spiral WITHOUT USING EVAL or FEVAL
Constructions that use feval or eval are used to cheat with cody. This test-suite tries to avoid that trick. The goal of this...

11年以上前

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Make a diamond
Given n, odd number > 1, return n by n matrix consist of "null" and "*" characters arranged like a diamond. No toolbox funct...

11年以上前

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

11年以上前

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Narcissistic number ?
Inspired by Problem 2056 created by Ted. In recreational number theory, a narcissistic number is a number that is the sum of ...

11年以上前

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Negation the hard way
Write a function that has the following property: f(f(x)) = -x for any numeric array x. Note that there is no restriction on ...

11年以上前

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Minefield Sonar
*Background* In mine-hunting games (e.g. Microsoft Minesweeper), the user is provided with a covered grid that, upon a left c...

11年以上前

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Simulating the selection of a state with given probabilities
Lets say we have 3 different states [1,2,3] with the probabilities of occurrences of each state is given as [0.5 0.2 0.3]. Which...

11年以上前

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Sort the vector with the given index
Given x = [1 2 4 8 17] and t = [1 3 2 5 4] then y = [1 4 2 17 8].

11年以上前

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Find the longest match inside two strings
Given two strings, find the longest string which is contained within both strings. e.g. the longest string that is contained ...

11年以上前

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Fill an array given a sum and array length values
Fill an array with random numbers so that their sum and array length will be equal to the given values as input. Function will ...

11年以上前

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What day is it?
Tell me what day is it. Return the full name of the day of the week as a string. e.g. It's June 12th 2014, so your function s...

11年以上前

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Method of Common Differences part-2
This is the inverse problem to <http://www.mathworks.com/matlabcentral/cody/problems/1485 Problem 1485>. Problem 1485 illustra...

11年以上前

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Disjunctive Normal Form
This problem is the companion to Problem <http://www.mathworks.com/matlabcentral/cody/problems/1484 1484>. In Boolean logic, a f...

11年以上前

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Integer Sequence - 1
Check the test suite to determine the relationship between input integer scalar and output integer scalar.

11年以上前

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Sum of the Matrix Elements
Add up all the elements in a NxM matrix where N signifies the number of the rows and M signifies the number of the columns. E...

11年以上前

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Find the right x in a 1. order Polynomal (y = m*x+c)
Given two points in a Cartesian coordinate system, find the x-value, where polynomial of 1. order (y = m*x+c) is equal to a giv...

11年以上前

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Sort (high on middle, low on ends)
Sort the vector of numbers in order low-high-low. Even numbers appear in ascending order on the left and odd numbers appear in d...

11年以上前

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Usage of mkdir and copyfile
This Challenge is to copy a file into a new directory multiple levels below existing directory architecture. System appears ...

11年以上前

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Numbers in extended form
Shhhhhhh. Don't tell my daddy, but I'm borrowing his Cody account so all of you very smart people can help me out. I just star...

11年以上前

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Find the position of last minimum value in an integer array with numbers
If x = [2 6 4 9 -10 3 1 5 -10] then the output should be 9, because last minimum value (-10) lies at the 9th position.

11年以上前

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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/...

11年以上前

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How unique?
Sometimes, when we check unique entries of vector we would like to know how many times each value occurs. Given vector of num...

11年以上前