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Evil Number

Check if a given natural number is evil or not. Read more at <https://oeis.org/A001969 OEIS>.

environ un an ago

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Sum of adjacent elements in a vector

Given a vector v, return a vector s containting the sum of every two adjacent elements in the vector. Every element s(i) cont...

environ un an ago

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Generate a string like abbcccddddeeeee

This is the string version of Problem 1035. <http://www.mathworks.com/matlabcentral/cody/problems/1035-generate-a-vector-like-1-...

environ un an ago

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5 Prime Numbers

Your function will be given lower and upper integer bounds. Your task is to return a vector containing the first five prime numb...

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The Glass Half Full

Identical glasses are placed in a triangular tower structure, such that the top level (L = 1) comprises one glass, the next leve...

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Counting candies

In a classroom of |'n'| children, every even numbered child gets one big candy and every odd numbered child gets two small candi...

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Distance a ball travels after throwing vertically

Calculate the total distance *'d'* (in meters) a ball would travel after *'s'* seconds and starting velocity of *'v'* (in m/s). ...

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Sum of digits of powers of 2

Given n, first, calculate the number 2^n. Then, sum the digits that comprise that number. For example: Input: n = 7 2^n = ...

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Vector Element Multiplication

Take two incoming vectors, and output the element wise multiplication of the vectors.

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Find my daddy long leg (No 's')

Given the ratio of the two legs (longer / shorter), and the hypotenuse length, find the value of the bigger leg.

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Replace x value into y value in string text.

Replace x value into y value in string text. Example text='Hello World' x='World', y='Universe' result='Hello Universe'.

environ un an ago

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Case-insensitive Character Detection

Find the index of a particular character in a string ignoring case. Example Input: x = 'aAbhhfdf' n = 'a' ...

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Number of occurrences of letter in a text

Given an input text either as a string or as a cell array of strings, return a (1 x 26) matrix containing the number of occurren...

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Funny problems

Generate the following vector： if n=1 then q=1; elseif n=2 then q=[2 2 1]; elseif n=3 then q=[3 3 3 2 2 1]; ... end

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Combined Ages 1 - Symmetric, n = 3

You have probably seen the common riddle wherein combined ages are provided and you must determine the individual ages. For exam...

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Given an input string, generate a variable name out of it

Given an input string, generate a variable name out of it in easy to read format by a programmer. If the input string contai...

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Number of divisors of a given number

Given a Number n, return the number of his divisors without listing them example: n=14 ; Divisors={1,7,2,14} ; y=4 n=...

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Check if inputted variable is a string or a number

Check if a inputted variable is a number or a string, given a string input (i.e. '1' is 1 and thus a number, 'a' is a string).

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Distance between Berlin and New York in km

Use Pythagoras to calculate the distance between two locations in km (based on their respective longitudes and latitudes). Fo...

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Frequency Analysis of Text

Frequency analysis is a common task in cryptoanalysis. It is essentially counting the occurrences of alphabets (regardless of ca...

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Write out numbers in words

Write out numbers in words ( range [0-9999] ) with British spelling rules. For example; * 1 > one * 56 > fifty-six * 100 >...

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Choose group with people

How many ways can you choose n groups of n people from n^2 people, assuming the groups are distinct? The number of people i...

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Selecting books on MATLAB for experts and beginners (blindfolded)

* Imagine you have been blindfolded and asked to pick up any two books randomly from the table. * There are n books suitable f...

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Book Club

A book club that has _K_ members, as a group, have to read _N_ books. Return how many different ways the members could read the ...

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Substring Extraction

In a given string, find the substring between Start_string and End_string. You will have to include or exclude the Start_str...

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Problem

Substring Extraction

In a given string, find the substring between Start_string and End_string. You will have to include or exclude the Start_str...

environ un an ago | 0

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Repeat string n times - 2

This is the two variable version of <http://www.mathworks.com/matlabcentral/cody/problems/42482-repeat-string-n-times Repeat str...

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how many of the entries are positive?

Given x= sin(linspace(0,10*pi,100)), how many of the entries are positive?

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Simple Past of Regular Verbs

Given a regular verb, return the simple past. Example Input verb = 'to work' Output simple_past = 'worked'

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