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Are you in or are you out?
Given vertices specified by the vectors xv and yv, and a single point specified by the numbers X and Y, return "true" if the poi...

12 years 前

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random picture with random colours
write a function which creates a random(x,y) matrix with random RGB colours for example create_pic(5,5) gives us a 3d matrix. ...

12 years 前

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Back to basics 14 - Keywords
Covering some basic topics I haven't seen elsewhere on Cody. Return a cell array of all MATLAB keywords

12 years 前

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Back to basics 7 - Equal NaNs
Covering some basic topics I haven't seen elsewhere on Cody. Given 2 input variables, output true if they are equal, false ot...

12 years 前

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Back to basics 11 - Max Integer
Covering some basic topics I haven't seen elsewhere on Cody. Return the largest positive integer MATLAB can handle.

12 years 前

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Back to basics 9 - Indexed References
Covering some basic topics I haven't seen elsewhere on Cody. Given an input matrix and row and column, output the index of th...

12 years 前

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Back to basics 8 - Matrix Diagonals
Covering some basic topics I haven't seen elsewhere on Cody. Given an input vector of numbers, output a square array with the...

12 years 前

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Better bullseye matrix
<http://www.mathworks.com/matlabcentral/cody/problems/18-bullseye-matrix Problem 18> asks to create a bullseye matrix like this:...

12 years 前

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Eight Queens Solution Checker
Write a function to verify whether an arrangement of queens on a chessboard is a valid solution to the classic <http://en.wikipe...

12 years 前

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N-Cards Problem
You have a deck of _N_ cards numbered in order from 1 to _N_. You discard the top card (card 1) and place the next card (card 2)...

12 years 前

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Find the "ordinary" or Euclidean distance between A and Z
A, B and Z define three points in the 3D _Euclidean_ space of the form: A = [x1;y1;0]; B = [x2;y2;0]; Z = [x2;y2;z]; Find th...

12 years 前

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Kaprekar numbers
Test if the input is a Kaprekar number: <http://mathworld.wolfram.com/KaprekarNumber.html>. Return a logical true or false. ...

12 years 前

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Construct a string from letters and counts
Given two input arrays like this: [5,3,1] ['a','b','c'] Output a string that contains each letter the specified num...

12 years 前

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Twins in a Window
<http://en.wikipedia.org/wiki/Twin_primes Twin primes> are prime numbers that differ by 2, such as [11,13] or [41,43]. Write a f...

12 years 前

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Woodall number
Test whether the input is a Woodall number: <http://en.wikipedia.org/wiki/Woodall_number> _Please do not cheat by simply chec...

12 years 前

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Test if a Number is a Palindrome without using any String Operations
*Description* Given an integer _X_, determine if it is a palindrome number. That is, _X_ is equal to the _X_ with the digits ...

12 years 前

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Reverse the Words (not letters) of a String
*Description* Change the words of a string such that the words appear in reverse order. You may assume that the string is a n...

12 years 前

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Create a function handle that reverses the input arguments of another function handle
Given a function that takes two input arguments and returns one output, create another function handle that performs the same op...

12 years 前

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Create a cell array out of a struct
Create a cell array out of a (single) struct with the fieldname in the first column and the value in the second column: in: ...

12 years 前

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Compute Area from Fixed Sum Cumulative Probability
In Matlab the code v = rand(1,3); v = v/sum(v); is sometimes suggested as a convenient means of generating three rando...

12 years 前

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Size of this cup?
The given vector has diameter of the cup in mm sampled at micrometer increments in depth from top to bottom, need output in cc a...

12 years 前

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Matrix with different incremental runs
Given a vector of positive integers a (>=0); How does one create the matrix where the ith column contains the vector 1:a(i) poss...

12 years 前

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Infernal Recursion
Consider the recursion relation: x_n = (x_(n-1)*x_(n-2))^k Given x_1, x_2, and k, x_n can be found by this definition. Wr...

12 years 前

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Number of Circles in a Number
Given a number, return the number of closed 'circles' in the base 10 numerical representation. Note: the number 4 has no circ...

12 years 前

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Back to basics 6 - Column Vector
Covering some basic topics I haven't seen elsewhere on Cody. Given an input vector, output true or false whether it is a colu...

12 years 前

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Triangle Numbers Below N
This is an offshoot of <http://www.mathworks.com/matlabcentral/cody/problems/5-triangle-numbers Cody Problem 5: Triangle Numbers...

12 years 前

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Parasitic numbers
Test whether the first input x is an n-parasitic number: <http://en.wikipedia.org/wiki/Parasitic_number>. ( _n_ is the second in...

12 years 前

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Angle between two vectors
You have two vectors , determine the angle between these two vectors For example: u = [0 0 1]; v = [1 0 0]; The a...

12 years 前

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Remove the polynomials that have positive real elements of their roots.
The characteristic equation for a dynamic system is a polynomial whose roots indicate its behavior. If any of the <http://www.ma...

12 years 前

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Get the area codes from a list of phone numbers
Given a string of text with phone numbers in it, return a unique'd cell array of strings that are the area codes. s = '508-647...

12 years 前