Marco Riani

Last seen: 1 day ago | Active since 2019

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Full Professor of Statistics (since 2006), University of Parma, Italy. Director of the interdepartmental center of robust statistics for big data (Ro.S.A.) of the University of Parma since 2016. He is author of more than 150 publications and two books published by Springer Verlag New York. His main research interests are robust statistics (regression, multivariate analysis and classification)

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longest common semi-substring
Finding longest common substring is a common problem in string processing. This problem is a variant of that. Two strings are g...

1 day ago

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Reverse within string
If input is a string 'yellow' the output should be 'leywol'. Locate the middle of the string and reverse the first (yel) and sec...

1 day ago

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Find the index of nth maximum of a row vector of real numbers
Given a vector of real numbers x, find the index idx of _n_ th maximum value. If nth maximum occurs more than once, return the i...

2 days ago

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Find the logic and return the nth number
given a sequence of numbers arranged in the following order: A=0,1,3,4,9,10,12,13,27,28,30,31,36,37,...... Write a function th...

2 days ago

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find nth even fibonacci number
1st even fibonacci number=2 ; 2nd even fibonacci number=8 ..

2 days ago

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Find the Nth Root of a Given Number
Find the Nth root of a given number x. Examples x = 4096 n = 4 y = 8 x = 625 n = 5 y = 3.6239

2 days ago

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Find the logic and return the nth number (plus)
This problem is the harder version of Problem 61015 given a sequence of numbers arranged in the following order: A=0,1,3,4,9,1...

2 days ago

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Find the nth composite number.
Everyone heard about the nth prime number. Let's try to find out the nth composite. For example , 1 is the first composite, 10 i...

2 days ago

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find the nth fibonacci number
The Fibonacci sequence is defined as follows: give n, find the nth fibonacci number

2 days ago

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Find nth number
The numbers 2 and 7 are called lucky numbers, an integer containing only the digits 2 and 7 is also called lucky number. The pro...

2 days ago

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find the nth number (plus)
this problem is the harder version of Problem 61014. The numbers 2 and 7 are called lucky numbers, an integer containing only t...

2 days ago

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FSDA - Flexible Statistics Data Analysis toolbox
Flexible Statistics Data Analysis Toolbox

3 days ago | 259 downloads |

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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...

8 days ago

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Compute a determinant
Write a function to compute the determinant of an x matrix with diagonal entries equal to an integer and other entries equal ...

12 days ago

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Mesh the octahedron
Problem statement An octahedron is a regular polyhedron with 6 vertices and 8 triangular faces. It is also one of the five we...

2 months ago

Submitted

A statistical analysis on COVID-19 data collection
Multialignment of fasta files to reference sequences, extract date and country. Analyze geographical diffusion

7 months ago | 1 download |

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The End of the World
given a date -- represent it in the Maya long count system. <https://en.wikipedia.org/wiki/Maya_calendar> <https://maya.nm...

8 months ago

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Lost days
Given two dates in a particular format, calculate the difference between them.

8 months ago

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Leap Year
According to Gregorian Calender(which is in use now, in many countries),decide whether a given year is a leap year or not. Give...

8 months ago

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leap year
find the number of leap years within the given time interval

8 months ago

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Friday or not
I love Friday. Please tell me whether the day is Friday. Dateformat is 'yyyy-mm-dd' or 'dd-mmm-yyyy' or 'mm/dd/yyyy'. Exa...

9 months ago

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Datetime basics
Generate the datetime scalar representing the current date

9 months ago

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Elapsed Time
Given two date strings d1 and d2 of the form yyyy/mm/dd HH:MM:SS (assume hours HH is in 24 hour mode), determine how much time, ...

9 months ago

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Find the day for a date
Today's day and date will be given to you. By utilising that you need to find the day of the old date. (Date will be in DD/MM/YY...

9 months ago

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Friday the 13th
According to superstition, lots of unpleasant stuff happens on Friday the 13th, so you might like to find the next occurence of ...

9 months ago

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Day counter function
Write a function called day_counter that returns the number of Mondays that fell on the first day of the month in a given year b...

9 months ago

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Count the days
Count the occurrence of a particular day (e.g. Monday) for a given duration.

9 months ago

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How long until the weekend?
Write a function a that takes a date vector as an input and returns the number of hours until the weekend begins. The beginning...

9 months ago

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Days until next NewYear ball drop
Given a date string in the form 'yyyy-mm-dd' or 'yyyy-mm-dd hh:mm:ss', calculate the number of *days* until the dropping of the ...

9 months ago

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sum of non-primes
The sum of the non-primes no larger than 10 is 1+4+6+8+9+10=38 Find the sum of all the positive non-prime integers that do no...

9 months ago