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Riccardo G.


Active since 2020

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I like Mathematics

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MATLAB
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English, French, German, Italian
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Professional Interests:
Mathematics

Statistics

Cody

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  • Strings II Master
  • Matrix Manipulation I Master
  • Divisible by x Master
  • Indexing II Master
  • Matrix Patterns II Master
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  • Cody Challenge Master
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Solved


Count the Number of Directed Cycles in a Graph
Given an asymmetric adjacency matrix, determine the number of unique directed cycles. For example, the graph represented by adj...

22 hours ago

Solved


Determine connected components of a graph
Adjacency matrix of an undirected graph is given. Return the number of connected components in the graph.

22 hours ago

Solved


Kryptos - CIA Cypher Sculpture: Vigenere Encryption
The <http://en.wikipedia.org/wiki/Kryptos Kryptos Sculpture> contains four encypted messages. This Challenge is to Encrypt tw...

23 hours ago

Solved


Kryptos - CIA Cypher Sculpture: Vignere Decryption
The <http://en.wikipedia.org/wiki/Kryptos Kryptos Sculpture> contains four encypted messages. This Challenge is to Decrypt tw...

23 hours ago

Solved


Morse Code Generator! Try it!
.... . .-.. .-.. --- . ...- . .-. -.-- --- -. . -.-.-- .-.. . - ... -.. --- ... --- -- . -- --...

2 days ago

Solved


Generate a melodic contour string matrix
<http://en.wikipedia.org/wiki/Parsons_code Parsons code> is a surprisingly effective way to identify music by its melodic motion...

2 days ago

Solved


Mean and standard deviation of times in string
Input(t) - cell of strings with times in format 'min:sec.ms' Output([m, s]) - two strings with mean and standard deviation wi...

2 days ago

Solved


Eliminate Polysyllabics: Long live short words!
Given a string s1, return s2 in which all the words with more than one syllable have been removed. To make things simple, we ...

2 days ago

Solved


Backslang, odds are you used it at some point in time...
So backslang is a language that can be used to communicate in an easy decode code, if people know the rules of decoding it. Wel...

2 days ago

Solved


Operate on matrices of unequal, yet similar, size
You may want to add a vector to a matrix, implying that the vector is added to each column of the matrix. Or multiply a 3x4x5 ma...

3 days ago

Solved


Removing rows from a matrix is easy - but what about inserting rows?
Assume A is a 5-by-5 matrix. A([2,4],:) = [] is a quick way to remove rows 2 and 4. Can you find a quick way to insert rows into...

3 days ago

Solved


N-Dimensional Array Slice
Given an N-dimensional array, _A_, an index, _I_, and a dimension, _d_, return the _I_ th elements of _A_ in the _d_ dimension. ...

3 days ago

Solved


Spiral Mandala
Generate a clockwise spiral pattern using 1s in an N×N matrix to create an intricate mandala effect. e.g. N = 5; y_correct...

3 days ago

Solved


Concentric Squares Mandala
Generate concentric square rings of alternating 1s and 0s to form a layered mandala-style matrix. e.g. N = 5; 1 1 1 1 1;...

3 days ago

Solved


Hourglass Mandala
Generate an hourglass shape using matrix geometry and symmetry. e.g. N = 5; 1 1 1 1 1; 0 1 1 1 0; ...

4 days ago

Solved


Vertical Mirror Mandala
Create a symmetric left-right mirrored pattern in an N×N matrix to emulate mandala reflection symmetry. e.g. N = 5; ...

4 days ago

Solved


Hollow Diamond Pattern
Create an N×N matrix that forms a hollow diamond shape using 1s, leaving the interior empty. This challenge emphasizes boundary ...

4 days ago

Solved


Filled Diamond Pattern
Create an N×N binary matrix that forms a filled diamond shape centered in the matrix. The diamond expands symmetrically toward t...

4 days ago

Solved


Make a diamond
Given n, odd number > 1, return n by n matrix consist of "null" and "*" characters arranged like a diamond. No toolbox funct...

4 days ago

Solved


Some Assembly Required
The input to this function is a matrix of real numbers. Your job is to assemble the rows of the matrix into one large row that ...

4 days ago

Solved


Divisible by n, Composite Divisors
Pursuant to <http://www.mathworks.com/matlabcentral/cody/problems/42453-divisible-by-n-prime-vs-composite-divisors Divisible by ...

4 days ago

Solved


Divisible by n, Truncated-number Divisors
Some divisors only require a few numbers at the end of the number in question to determine divisibility, no matter how long. Exa...

4 days ago

Solved


Divisible by n, prime divisors from 20 to 200
Pursuant to the previous problem (linked below), this problem requires a function that checks for divisibility of large numbers ...

4 days ago

Solved


Divisible by n, prime divisors - 11, 13, 17, & 19
Divisibility checks against prime numbers can all be accomplished with the same routine, applied recursively, consisting of add ...

5 days ago

Solved


Problem Set 2
Make a calculator by the four main operators (op): + - * / And the two numbers (n1, n2). Don't forget to check to divisio...

5 days ago

Solved


Problem Set 1
You will get the vector "v", you should put it's length in a variable called "lngth", then... If it's length from 1 to 5, sz = ...

5 days ago

Solved


Switch-Case-Otherwise
You should make random numbers to 10, by 3 rows and 3 columns. Cases from 1 to 3, b = true. Otherwise, b = false.

5 days ago

Solved


NOT
If a not equal to zero, b = true, else, b = false.

5 days ago

Solved


OR
If a greater than zero or c less than 10, b = true, else, b = false.

5 days ago

Solved


AND
If a greater than 0 and n less than 10, b = true, else, b = false. (Checking a should be in one line by AND special sign in MAT...

5 days ago

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