Solved

Beginner's Problem - Squaring

Try out this test problem first. Given the variable x as your input, square it by two and put the result in y. Examples: ...

1 year ago

Solved

Divide by 4

Given the variable x as your input, divide it by 4 and put the result in y.

1 year ago

Solved

Write a code that will follow the equation y = x * (x + x) * x.

If x = 5, y = 5 * (5+5) * 5 = 250

1 year ago

Solved

Given the variable x as your input, multiply it by four, then divide it by two. Then put the result in y.

If x = 5, y = 4*5/2 = 10

1 year ago

Solved

Shuffle

Shuffle a vector by breaking it up to segments of |n| elements, and rearranging them in a reversed order. For example, the ve...

1 year ago

Solved

Convert a vector to a lower triangular matrix

I now have a row vector and I want to convert it to a lower trilangular matrix. The rows of the lower trilangular matrix have...

1 year ago

Solved

Produce the following matrix

Produce the following matrix x = [2 3 4] y_correct = [1 1/2 1/3; 2 1 1/4; 3 4 1];

1 year 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...

1 year ago

Solved

Longest run of consecutive numbers (★★★★★)

(copy of Problem 672) Given a vector a, find the number(s) that is/are repeated consecutively most often. For example, if you...

1 year ago

Solved

Find longest run

Write a function longest_run that takes as input an array of 0's and 1's and outputs the length and index of the longest consecu...

1 year ago

Solved

expand intervals

You're given a row vector of an even number of monotonically increasing integers. Each pair of consecutive integers is the lower...

1 year ago

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...

1 year ago

Solved

Sum the Infinite Series

Given that 0 < x and x < 2*pi where x is in radians, write a function [c,s] = infinite_series(x); that returns with the...

1 year ago

Solved

Pairwise column flip

Given matrix *M_in*, flip every pair of columns. So if *M_in* is 1 2 3 4 1 2 3 4 then *M_out* is 2 1 4 3 2 1 4 3 ...

1 year ago

Solved

Get a new matrix by mapping each element of an arbitrary-sized input matrix using lookup table

A is a matrix of any size and dimension. Each element of matrix A belongs to the set S of natural numbers up to N. B is a vector...

1 year ago

Solved

Sorting integers by their digits (Level 2)

This is the next step up from <http://www.mathworks.com/matlabcentral/cody/problems/42809-sorting-integers-by-their-digits Probl...

1 year ago

Solved

Sorting integers by their digits (Level 1)

Given a vector, v, of positive integers, return a vector, w, by sorting v in ascending order, such that primary sorting is done ...

1 year ago

Solved

Is A the inverse of B?

Given a matrix A and a matrix B, is A the inverse of B? >>A=[2,4;3,5]; >>B=[-2.5,2;1.5,-1]; >>isInverse...

1 year ago

Solved

Sorting integers by their digits (Level 4)

This is the next step up from <http://www.mathworks.com/matlabcentral/cody/problems/42815-sorting-integers-by-their-digits-level...

1 year ago

Solved

Sorting integers by their digits (Level 3)

This is the next step up from <http://www.mathworks.com/matlabcentral/cody/problems/42811-sorting-integers-by-their-digits-level...

1 year ago