# Matteo Valentinuzzi

Energy engineer

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**Content Feed**

Solved

An asteroid and a spacecraft

🚀 Imagine a non-relativistic simple situation. Assume positions p0, p1, p2, and p3 are three dimensional Cartesian ...

2 months ago

Solved

Easy Sequences 4: Eliminate the Days of Confusion

If a date is written in purely numeric format some dates can be confusing, if we don't know the date format used. For example, "...

2 months ago

Solved

Easy Sequences 1: Find the index of an element

The nth element of a series A is defined by: . Obviously, the first element A(1) = 1. Given the nth element 'A(n)', find the val...

2 months ago

Solved

Divisible by n, prime vs. composite divisors

In general, there are two types of divisibility checks; the first involves composite divisors and the second prime divisors, inc...

2 months ago

Solved

Divisible by 13

Write a function to determine if a number is divisible by 13. Similar to the number seven, this can be done by a few different m...

2 months ago

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Divisible by 16

Write a function to determine if a number is divisible by 16. This can be done by a few different methods. Here are two: # If...

2 months ago

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Divisible by 15

Write a function to determine if a number is divisible by 15. If a number is <http://www.mathworks.com/matlabcentral/cody/proble...

2 months ago

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Divisible by 14

Write a function to determine if a number is divisible by 14. If a number is <http://www.mathworks.com/matlabcentral/cody/proble...

2 months ago

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Divisible by 12

Write a function to determine if a number is divisible by 12. Similar to the number six, this can be done by checking for divisi...

2 months ago

Solved

Divisible by 10

Pursuant to the <http://www.mathworks.com/matlabcentral/cody/problems/42404-divisible-by-2 first problem> in this series, this o...

2 months ago

Solved

Divisible by 9

Pursuant to the <http://www.mathworks.com/matlabcentral/cody/problems/42404-divisible-by-2 first problem> in this series, this o...

2 months ago

Solved

Divisible by 8

Pursuant to the <http://www.mathworks.com/matlabcentral/cody/problems/42404-divisible-by-2 first problem> in this series, this o...

2 months ago

Solved

Divisible by 7

Pursuant to the <http://www.mathworks.com/matlabcentral/cody/problems/42404-divisible-by-2 first problem> in this series, this o...

2 months ago

Solved

The Answer to Life, the Universe, and Everything

A variation of a previous Hitchhiker's Guide to the Galaxy problem. *Inputs:* Life, the Universe, and Everything *Output:*...

2 months ago

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How many jokers?

* Given DNA codes of a group of suspects, * and a code for certain types of jokers, * Count how many jokers of that type. * ...

2 months ago

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The Hitchhiker's Guide to MATLAB

Output logical "true" if the input is the answer to life, the universe and everything. Otherwise, output logical "false".

2 months ago

Solved

Combined Ages 2 - Symmetric, n ≥ 3

Following on <http://www.mathworks.com/matlabcentral/cody/problems/42382-combined-ages-1-symmetric-n-3 Combined Ages 2>, you wil...

4 months ago

Solved

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...

4 months ago

Solved

Solve the set of simultaneous linear equations

Given this pair of simultaneous linear equations: 2x + 3y = 23 3x + 4y = 32 Find the solution set (x,y)

4 months ago

Solved

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 ...

4 months ago

Solved

Column norms of a matrix

Given a matrix M, return a vector y such that for each k y(k)=norm(M(:,k)) (y(k) is the Euclidean norm of the k-th col...

4 months ago

Solved

Must be in the front row...

You are given a matrix followed by a single number. Your object is to write a script that will shift the matrix around so that ...

4 months ago

Solved

Magnet and Iron

(Inspired from <http://www.mathworks.com/matlabcentral/cody/problems/112 Problem 112: Remove the air bubbles>) Iron (atomic n...

4 months ago

Solved

Replace Nonzero Numbers with 1

Given the matrix x, return the matrix y with non zero elements replaced with 1. Example: Input x = [ 1 2 0 0 0 ...

4 months ago

Solved

Matrix multiplication across rows

Given matrix m, return matrix n such that, rows of n are result of multiplication of the rows of the input matrix Example ...

4 months ago

Solved

Convert matrix to 3D array of triangular matrices

Given a 2D numeric array x in which each column represents the vectorized form of an upper triangular matrix, return a 3D array ...

4 months ago

Solved

Too Many Zeros, Dump Them!

Sometimes when I create a matrix, I use this syntax: a = zeros(1000,1000); But when the function ends, I find that I don'...

4 months ago

Solved

Divisible by 6

Pursuant to the <http://www.mathworks.com/matlabcentral/cody/problems/42404-divisible-by-2 first problem> in this series, this o...

4 months ago

Solved

Divisible by 5

Pursuant to the <http://www.mathworks.com/matlabcentral/cody/problems/42404-divisible-by-2 first problem> in this series, this o...

4 months ago