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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. ...

8 years ago

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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...

8 years ago

Solved

Sum of diagonals elements of a matrix

Given a matrix, return the sum of all the elements across the diagonals. E.g. A = [1 2 3; 4 5 6; 7 8 9;...

8 years ago

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Derivative of polynomial

Compute the derivative of a given polynomial. The input is an <http://www.mathworks.com/help/matlab/math/representing-polynomial...

8 years ago

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Function composition - harder

Write a function that accepts an arbitrary number of function handles f_1, f_2, ..., f_n and returns the composition h. That is,...

8 years ago

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Find number of days

The input is two date in string format (dd-mm-yyyy) find out the number of days between these two dates. Example: input: ...

8 years ago

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7 segment LED display

Given a whole number, output how many segments would be lit up to display it on a 7 segment LED display (http://en.wikipedia.org...

8 years ago

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letter yes yes & letter no no

Split a string into two strings, first string has all alphabetic letters, next string has all the rest, keep the order please, o...

8 years ago

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Cody Computer Part 5 - Guess the Name of Cody Computer

Network computers have generally a nickname to be identified. Can you guess the nickname of the Cody Computer? No inpu...

8 years ago

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Remove the two elements next to NaN value

The aim is to *remove the two elements next to NaN values* inside a vector. For example: x = [6 10 5 8 9 NaN 23 9 7 3 21 ...

8 years ago

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Wrapping the Tower of Pisa

The famous artist Christo Vladimirov Javacheff, who likes pizza, wants to wrap the well-known Italian tower in paper. It is a ci...

8 years ago

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System of equations

Find a solution to a system of equations represented by a |n| by |n+1| matrix. For instance, [ 2 0 4; => 2*x = 4 ...

8 years ago

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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:...

8 years ago

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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...

8 years ago

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Back to basics 18 - justification

Covering some basic topics I haven't seen elsewhere on Cody. Given a string with extra spaces in front and/or in back, return...

8 years ago

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Make an N-dimensional Multiplication Table

*INSTRUCTIONS* This is a multi-dimensional variant of the normal multiplication table used to teach elementary students multi...

8 years ago

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Who is the baby and who is the daddy in this family?

Given an array of numbers that shows the characteristcs of all family members, find who is the baby and who is daddy in this fam...

8 years ago

Solved

return row and column indices given 2 values which define a range

Inspired by problem <http://www.mathworks.co.kr/matlabcentral/cody/problems/856-getting-the-indices-from-a-matrice> Inputs: - ...

8 years ago

Solved

Gauss Eliminate 2-by-2 example

Use forward elimination to make the coefficient matrix, A, an upper triangular matrix, and then solve using back substitution, f...

8 years ago

Solved

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...

8 years ago

Solved

collision

several cars (n) were involved in this collision, the input matrix (vm) has n rows and two columns, first column for velocity an...

8 years ago

Solved

A matrix of extroverts

Now that the introverts have had their script, the extroverts spoke up (naturally!) and demanded one as well. You will be given...

8 years ago

Problem

return row and column indices given 2 values which define a range

Inspired by problem <http://www.mathworks.co.kr/matlabcentral/cody/problems/856-getting-the-indices-from-a-matrice> Inputs: - ...

8 years ago | 2 | 53 solvers

Solved

Getting the indices from a matrice

Getting the indices from a matrice. Inspired by Problem 645. Getting the indices from a vector by the great Doug Hull. Given a...

8 years ago

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Calculate the height of an object dropped from the sky

Assume that an object is dropped from 1000 meters above the surface of the earth at time t=0. The object is dropped such that t...

8 years ago

Solved

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...

8 years ago

Solved

Add more zeros

Find code that adds one 0 to each sequence of 0 in a string (composed with only 0 or 1). For example: '1010' -> '100100' ...

8 years ago

Solved

Relative ratio of "1" in binary number

Input(n) is positive integer number Output(r) is (number of "1" in binary input) / (number of bits). Example: * n=0; r=...

8 years ago

Solved

Create an 'arrow-head" matrix

Write a function that when given an odd number, produces an arrow-head function pointing to the right. Examples n = 3 ...

8 years ago