Solved

Find: Faster Alternatives for Large Sorted/Unique Vectors
The Challenge is to create faster Find methods for large unique ascending vectors. Methods exist that are 1000 times faster t...

14 years ago

Solved

QWERTY Shift Encoder
Encode a string using the QWERTY shift code. This code is where you touch type but are offset by one character to the right. ...

14 years ago

Solved

ismember: Enhanced Performance for 'rows' and width - Speed Scoring (66% savings)
The Challenge is to perform very fast the 'ismember' function for a long and wide array. The width of the array is expanded fro...

14 years ago

Solved

Unique: Enhanced Performance - Large and Wide Array - Speed Improvement (66% savings)
The Challenge is to perform very fast unique function for a long and wide array. The data is small integer representing data ...

14 years ago

Solved

ismember: Enhanced Time Performance for 'rows' - Speed Scoring (90% savings)
The Challenge is to perform very fast the 'ismember' function for a long and wide array. The data is small integer representi...

14 years ago

Solved

Persistent Usage
This Challenge is to implement the Matlab Persistent variable capability. Given a sequence of Calls to a function return the ...

14 years ago

Solved

Unique: Faster 'rows' for large array of uint8
Challenge: Execute unique(a,'rows') Faster for 'a' being uint8. The "unique" function for the 'rows' options may be performe...

14 years ago

Solved

Largest Twin Primes
<http://en.wikipedia.org/wiki/Twin_prime Twin primes> are primes p1, p2 = p1 + 2 such that both p1 and p2 are prime numbers. Giv...

14 years ago

Solved

Circular Primes (based on Project Euler, problem 35)
The number, 197, is called a circular prime because all rotations of the digits: 197, 971, and 719, are themselves prime. The...

14 years ago

Problem

Circular Primes (based on Project Euler, problem 35)
The number, 197, is called a circular prime because all rotations of the digits: 197, 971, and 719, are themselves prime. The...

14 years ago | 10 | 662 solvers

Solved

Find files with extension ext in the current directory
List all files with extension 'ext' in the current directory. Return a char matrix with the name of files in rows. Return 0 if...

14 years ago

Solved

Guess the Coefficients!
Given a polynomial _p_ known to have positive integer coefficients, deduce the values of the coefficients. For example: ...

14 years ago

Solved

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...

14 years ago

Solved

Square Digits Number Chain Terminal Value (Inspired by Project Euler Problem 92)
Given a number _n_, return the terminal value of the number chain formed by summing the square of the digits. According to the P...

14 years ago

Solved

Next Higher Power of B
|Given a number _n_ and a base _B_ greater than 1, return the lowest integer power of _B_ that is greater than or equal to _n_. ...

14 years ago

Solved

Next Lower Power of B
Given a number _n_ and a base _B_ greater than 1, return the lowest integer power of _B_ that is less than or equal to _n_. E...

14 years ago

Solved

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...

14 years ago

Solved

Now!
I said now!

14 years ago

Solved

Television Screen Dimensions
Given a width to height ratio of a TV screen given as _w_ and _h_ as well as the diagonal length of the television _l_, return t...

14 years ago

Solved

magic solver
Create a function that returns _true_ and has a cody <http://www.mathworks.com/matlabcentral/cody/problems/256-return-the-size-o...

14 years ago

Solved

Detect a number and replace with two NaN's
Write code which replaces the number 1 with two NaNs. Example X = [ 1 2 NaN 4 1 3 7 NaN 1 4 NaN 2] ...

14 years ago

Solved

Guess Cipher
Guess the formula to transform strings as follows: 'Hello World!' --> 'Ifmmp Xpsme!' 'Can I help you?' --> 'Dbo J ifmq zpv...

14 years ago

Solved

Lychrel Number Test (Inspired by Project Euler Problem 55)
The task for this problem is to create a function that takes a number _n_ and tests if it might be a Lychrel number. This is, re...

14 years ago

Solved

Phoneword Translator
Given an alphanumeric telephone number (Ex. 1-800-COLLECT), return the purely numeric phone number as a vector. This problem use...

14 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...

14 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...

14 years ago

Problem

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...

14 years ago | 20 | 328 solvers

Solved

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...

14 years ago

Solved

Rank of magic square (for beginners)
Compute the rank r of a magic square of order n WITHOUT rank and magic functions.

14 years ago

Solved

Magic is simple (for beginners)
Determine for a magic square of order n, the magic sum m. For example m=15 for a magic square of order 3.

14 years ago