Alexander Ross

Last seen: Today | Active since 2024

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Biomedical researcher.

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

2 hours ago

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Is the Point in a Circle?
Check whether a point or multiple points is/are in a circle centered at point (x0, y0) with radius r. Points = [x, y]; c...

1 day ago

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Give a matrix that matches itself when rotated
Given n and s, return a n-by-n matrix a of integers such that sum(sum(a == rot90(a))) is equal to exactly s. The integer...

2 days ago

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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...

2 days ago

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DNA Pattern Match: Performance Metric - Speed
The Challenge is to Rapidly find matches of DNA sequences, Length=6, in a 1,800,000 long DNA file. At <http://imacst.com/issu...

2 days ago

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What is Title of Cody Challenge 42?
Given a Cody Challenge number return its Title. *Input:* Cody Challenge Number *Output:* Title of the Cody Challenge ...

2 days ago

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Change a specific color in an image
The ability to change colors can be a useful tool in image processing. Given an m x n x 3 array (much like CData in images), fin...

2 days ago

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Sort an array of structures
You need to sort an array of structures based upon *a numeric first field*: For example : a.n=1; a.name='a'; b.n=3...

2 days ago

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Encoding Google Maps Polylines
This problem is based on the Google Polyline Encoder algorithm. This is how Google Maps encodes a line for display on a map. You...

2 days 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'...

3 days ago

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Count photos
Given n people, everyone must have pictures taken with everyone, each photo includes only two persons, please count the total nu...

3 days ago

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function on a moving window
Create a function that applies an operation (such as @sum, @mean, @std, @norm etc) to a moving window of the data. First exampl...

3 days ago

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Covering area
As an extension of the problem <http://www.mathworks.com/matlabcentral/cody/problems/416-polygon-area>, find the area, bounded b...

3 days ago

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You LOVES Matlab 41%
Given two strings, determine the percentage that one loves the other in the following way: YOU LOVES MATLAB there is 1 '...

3 days ago

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Biggest Value in the (Neighbor)Hood
For this challenge you get two inputs: a matrix A and an integer value n. Your function should return a Matrix B of the same siz...

3 days ago

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Fizz Buzz
Given an array of positive, non-zero, integers, return a cell array of strings the same size as the input, where each element in...

3 days ago

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Create a dictionary
The goal is to write a function that returns a dictionary from a list of words or phrases and their definitions. Here is an exam...

3 days ago

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Check if any duplicates in your data
Given an array x, return a number n equal to the largest number of repetitions in your data. For example: If x=[1 2 3 6 8 4 9]...

4 days ago

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Scoring for oriented dominoes
Given a list of ordered pairs, and the order they should be placed in a line, find the sum of the absolute values of the differe...

4 days ago

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How many bottles can you drink?
Sometimes if you buy a drink in a glass bottle you can return that bottle and get some money back. Let's assume we have "x" a...

4 days ago

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Multiply 2 numbers
Very easy, you just have to multiply 2 numbers but you cannot use the following signs (*, /, - ,^) ,mtimes , times, cross, pro...

4 days ago

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Create matrix with Gray code
Output "g" should be a matrix of class double, with <http://en.wikipedia.org/wiki/Gray_code Gray reflected binary code>. Inpu...

4 days ago

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Do you have the minimum age?

6 days ago

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Largest Rectangle Area in a Histogram
Given a histogram represented by an array of integers, e.g., [2, 1, 4, 5, 1, 3, 3] : find the maximum area of a rectangle tha...

6 days ago

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Reverse Integer
You are given an integer, reverse its digits. For negative integers, the sign should remain in the front. For instance, 12340 s...

6 days ago

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Determine if a Digit is Isolated
A digit is considered isolated if both its left and right neighbors are different from itself. For example, in the number 776444...

6 days ago

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Absolute Sorting
Given an array with various numbers, your have to sort it by absolute value in ascending order. For example, for the array [-2...

6 days ago

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Counting the occurrences of a digit in a book
The printer has printed a book with 'p' pages. How many times did they use the character 'd'? In other words, how many times doe...

6 days ago

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Spreadsheet Column Number
Spreadsheet uses an alphabetic naming system for columns, starting with 'A', 'B', 'C', etc. The column names continue like 'AB',...

7 days ago

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Perfect shuffle
We call "perfect shuffle" the process of cutting a deck of cards into two equal halves, and then perfectly interleaving them: on...

7 days ago