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Return 'on' or 'off'
When the input is true, return 'on', otherwise, return 'off'.

13 years ago

Solved

matrix zigzag
Unfold a 2-D matrix to a 1-D array in zig-zag order, e.g., for matrix [ 1 2 3 ; 4 5 6 ; 7 8 9 ] the resulting 1-...

13 years ago

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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...

13 years ago

Solved

Go-style solver
Consider a variation of the game Go where one player has gone ahead and placed several pieces all at once. Assuming that the sec...

13 years ago

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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...

13 years ago

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Unique values without using UNIQUE function
You must return unique values in a vector in *stable* mode without using the unique function. About stable order flag: ...

13 years ago

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Remove NaNs and numbers adjacent to NaNs
The aim is to remove the elements before and after NaN occurrences inside a vector. For example: x = [6 10 5 8 9 NaN 23 1...

13 years ago

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Decrypt Polybius
Decrypt Polybius square. Please refer to <http://www.mathworks.com/matlabcentral/cody/problems/1150-polybius-square Problem 11...

13 years ago

Solved

Polybius Square
Given a string, calculate the coordinates. Input will be always in lowercase. If string is a sentence then use 0 (zero) to indic...

13 years ago

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Accessing elements on the diagonal
Access the diagonal elements of a matrix without 'diag' function

13 years ago

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Sum the Digits of a Number
Given an integer, sum the digits repeatedly until you end up with a single value less than 10. For example, if you add the di...

13 years ago

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Happy 2013...
Happy 2013, everyone! An interesting tidbit about 2013 is that it is the first year since 1987 to contain four different digits...

13 years ago

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Repopulate the City
For any population p of positive integers between pmin and pmax, we can calculate histogram count n for a list of evenly dividin...

13 years ago

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The Dark Side of the Die
It is well-known that opposite sides of a classic hexahedral die add to 7. Given a vector of dice rolls, calculate the sum of th...

13 years ago

Solved

Coin Tossing: Probability of Same Heads for N tosses
A pair of physicists toss a coin n times each. What is the probability that they tossed the same number of heads? *Input:*...

13 years ago

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Usage of varargout
This Challenge is to demonstrate usage of varargout. Output a cell array using varargout of magic squares of size 1 thru n. ...

13 years ago

Solved

Unique: Enhanced Performance - Avoiding Memory Crash
The Challenge is to create the unique array for a long and wide array. Difficulties are that the normal unique(a,'rows') func...

13 years ago

Solved

Find the solution of algebraic equation
Find the solution of algebraic equation of the form an*x^n + a(n-1)*x^(n-1) + (an-2)*x^(n-2)+...... a2*x^2 + a1*x^1 + a0 = 0;...

13 years ago

Solved

Generate pi using logarithm
Generate pi using logarithm

13 years ago

Solved

Sum the elements in either diagonal of a square matrix
Sum the elements of a square matrix that lie on either the major diagonal or anti-diagonal.

13 years ago

Solved

Identify the heavier bag
There are N=2^n bags of rice looking alike, N-1 of which have equal weight and one is slightly heavier. The weighing balance is ...

13 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...

13 years ago

Solved

Multiples of a Number in a Given Range
Given an integer factor _f_ and a range defined by _xlow_ and _xhigh_ inclusive, return a vector of the multiples of _f_ that fa...

13 years ago

Solved

Determine if input is a perfect number
A <http://en.wikipedia.org/wiki/Perfect_number/ perfect number> occurs whent the sum of all divisors of a positive integer, exce...

13 years ago

Solved

Test if two numbers have the same digits
Given two integers _x1_ and _x2_, return |true| if the numbers written with no leading zeros contain the same digits. That is, t...

13 years ago

Solved

Sort an array of structures
You need to sort an array of structures based upon *a numeric first field*: For example : a.n=1; a.name='a'; b.n=3...

13 years ago

Solved

String substitution, sub problem to cryptoMath
This is a sub problem related to this problem: <http://www.mathworks.com/matlabcentral/cody/problems/621-cryptomath-addition>...

13 years ago

Solved

Create Circular Perfect Square Sequence
A sequence v(1:N) made of values 1:N can be created for N>31 such that v(i)+v(i+1) is a perfect square. The sum of v(N)+v(1) mus...

13 years ago

Solved

Compression: Encode and Decode
This Challenge is to compress an array created by randi(2^32-1,1000) and then decompress your data file. The first call will ...

13 years ago

Solved

How to add?
* Imagine you are in 2222 Anno Domini, when everyone must learn how to add, * and competing for the highly prestigious post of,...

13 years ago