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Implement a counter
Write a function that returns a function that counts the number of times it is invoked. Example: >> h = counter; >> h() ...

13 years ago

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2D - Mean Filter
Assume you are given an "image" matrix of size NxM. Reduce the image noise by implementing a mean filter window of size 9 (a 3x3...

13 years ago

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

13 years ago

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Two-output anonymous function?
Return a function handle that when applied to an input, it produces two outputs: the first is the same as the input, and the sec...

13 years ago

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Vector Linear sum: (p1-m1)V1+(p2-m2)V2+...(pK-mk)Vk
Calculate the sum of a Vector times coefficients expressed as two strings. Example: Normal representation [ a b c ], [ p1 ...

13 years ago

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Frobenius Norm
Write your own version of Frobenius Norm without using the 'norm' function.

13 years ago

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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...

13 years ago

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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...

13 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....

13 years ago

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All Humans are Created Equal - Pareto Equality
One way or the other two sets of identical types can come out ahead of the other by idea of Pareto equality. Pareto equality b...

13 years ago

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Decrypt a secret message!
The crypto system in question is based on phone keyboard. We need two numbers in order to decrypt a word. First number represent...

13 years ago

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Alias abs to asb
Create an alias of a built-in function name. Goal is to alias asb with abs for dyslexic typers. The test suite will be ...

13 years ago

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How many palindromes?
* Given a set of letters, count all possible palindromes, using all of those letters. * For example, if the set is {'A' 'A' 'A'...

13 years ago

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Bisection method of finding a root.
Test the bisection algorithm described in Chapter 5 of Steven C. Chapra's textbook, *Applied Numerical Methods with MATLAB for E...

13 years ago

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What gear ratio does the cyclist need?
A cyclist (perhaps including our famed Codysolver the cyclist <http://www.mathworks.com/matlabcentral/cody/players/1841757-the...

13 years ago

Solved

Number of bytes required to store a sparse matrix
The input is always a *sparse* matrix : x = sparse(100,1000,0.01); >>whos x shows that 4016 bytes ares required . ...

13 years ago

Solved

Parse string and identify specific string sequence in algebraic equation
Given a string S that defines an algebraic expression such as: S= 'X= A1 + A2*(Y1 + A3*Y3)*exp( A4*Y12 + Y1) ;' return a...

13 years ago

Solved

Procrustean bed
Given a vector x and an integer n, convert x to a vector of length n by (1) chopping off the end if it is too long, or (2) addin...

13 years ago

Solved

Pi Estimate 2
Estimate Pi as described in the following link: <http://www.people.virginia.edu/~teh1m/cody/Pi_estimation2.pdf>

13 years ago

Solved

Math with Roman Numerals
Given a function R within (+,-,*,/) and two Roman numerals a & b, compute aRb in Roman numerals.

13 years ago

Solved

Create array of all Distances between two Sets of Points : No Neural Network Toolbox
This Challenge is a subsection of <http://www.mathworks.com/matlabcentral/cody/problems/1110-usc-fall-2012-acm-martian-pranks Ma...

13 years ago

Solved

Convert single-precision floating-point number to binary representation
Write a function which takes a scalar <http://en.wikipedia.org/wiki/Single-precision_floating-point_format single-precision floa...

13 years ago

Solved

Create array of all Distances between two Sets of Points
This Challenge is a subsection of <http://www.mathworks.com/matlabcentral/cody/problems/1110-usc-fall-2012-acm-martian-pranks Ma...

13 years ago

Solved

Golomb's self-describing sequence (based on Euler 341)
The Golomb's self-describing sequence {G(n)} is the only nondecreasing sequence of natural numbers such that n appears exactly G...

13 years ago

Solved

Greed is good - Simple partition P[n].
Find a simple partition P[n]. E.g. P[10] = 4 + 3 + 2 + 1. # There are many solutions, compute just one set. # Don't repeat ...

13 years ago

Solved

Find similar/related functions
The _help_ function can be useful for getting quick assistance on a particular function. For most built-in MATLAB functions, a p...

13 years ago

Solved

Finite Continued Fraction
Given an input real number x and a natural number n, output the row vector with the n first terms of the continued fraction. F...

13 years ago

Solved

Simple Decoder Ring
The stereotypical _decoder ring_ is remembered as a cereal box prize from the 1950s. Kids learned about cryptography by startin...

13 years ago

Solved

Make a logical diamond using GALLERY function
Inspired from <http://www.mathworks.com/matlabcentral/cody/problems/1078-make-a-diamond Problem 1078. Make a diamond> In thi...

13 years ago

Solved

Apply a function array to an array of numbers
It is required to apply a cell array of functions to a numerical array, where the functions accept only scalar inputs. Exampl...

13 years ago