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Simple Caesar Cypher - shift encrypt a message given an index number
A Caesar cypher is a simple shift encryption method. Your goal is to create a function that allows a user to input a string and ...

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Simple Decoder Ring
The stereotypical _decoder ring_ is remembered as a cereal box prize from the 1950s. Kids learned about cryptography by startin...

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Split a given string from the first instance of a given character
A simple operation to split a given string into two substrings at the point where the desired character is first found. e.g. ...

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Is the paranthesis sequence balanced ?
Quantum mechanics and computer science are interested in bra-kets. Today however you, the player, will have to write a function ...

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Alternately upper-lower case
Modify the string to alternate between upper and lower case. For example, s='achyuta' output='AcHyUtA' Update - Test case...

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Make a list string
Given a cell string, produce a string separating the items with spaces and commas and with an 'and' preceding the final item, an...

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Count letters occurence in text, specific to words with a given length.
Build a function with two input arguments: a string and a word length (number of letters), that outputs a vector of counts of th...

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most frequent character
Obtain the most frequent character. For example, s='balaram'; output='a'; If there is a tie between letters, return t...

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Find the position of planet in solarsystem
Write a funtion named *nthplanet* which takes name of the planet as input string and provides the position of the planet, starti...

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Determinate if day D is a date that occurs during Daylight Saving Time in Italy
<https://en.wikipedia.org/wiki/Summer_Time_in_Europe>

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How many hours are there in a day in Italy?
Remember "European Summer Time"

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Neural Net: Calculate Perceptron
This challenge is to calculate the Neural Net Perceptron value,P, given X, WH, and WP using ReLU on the hidden layer. This examp...

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QWERTY Shift Code Decoder
Decode a string encoded using the QWERTY shift code. QWERTY shift code is where the message was touch typed but with an offse...

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Set defaults
Write a function that computes the volume of a cube. The function should be able to accept three inputs: the length, width, and...

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Formatting currency numbers
Given a number, format it properly for textual display using the notation $xxx,xxx,xxx.xx. Assume that no more than two digits ...

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Remove Duplicate Words from a Sentence.
Given a sentence, remove any duplicate words, leaving only the first occurrence of each word. The output sentence should have wo...

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Remove Duplicate Words from a Sentence
Given a sentence as a string, remove all duplicate words while keeping their first occurrence and maintaining the original word ...

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Similar triangles

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Figurate number triangle
Check whether the input matrix is a figurate number triangle: <http://mathworld.wolfram.com/FigurateNumberTriangle.html>

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Only once: cleaning up your columns
We have a logical array (with ones and zeroes). It is simple: after processing every column may only contain a single true value...

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Draw 'Y'
Draw 'Y' in an x-by-x matrix (where x is odd and x >= 3) Examples: x = 3 y = [1 0 1 0 1 0 0 1 0] x = 5 y = [1...

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Red Cross ❌

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The Ulam Matrix
The Ulam spiral is simple to describe. On a gridded piece of paper, write down the number 1. Then write successive integers as y...

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GCD

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Calculate inverse matrix in m by n matrix
x=(1:10)' y=roundn(2*x+7*rand(size(x)),-1) a*x=y Estimate a using inverse matrix calculation. This is principle of li...

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Convert this color - RGB Vector to Hex String
Given a 3 element RGB vector corresponding to a color (given by the MATLAB color spec <http://www.mathworks.com/help/matlab/ref/...

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Find the area between curves (P3)

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Calculate the sum of first x natural numbers
Calculate the sum of first x natural numbers for example if n=10 output =1+2+..+10=55

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Suma de Gauss
¿Cuál es la suma de los primeros enteros positivos?

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The Case of the Missing Prototype – Identify the Thief by Comparing Suspects’ Evidence and Alibi Scores
After gathering fingerprints, alibis, sensor data, and digital clues, it’s time to pinpoint the thief. You have a struct array ...

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