John D'Errico
Retired
Followers: 1
Adam Danz
A retired applied mathematician, consultant, sometime mechanical engineer, numerical analyst, woodworker, bridge player. Please DON'T contact me, as too many students then decide I am their personal consultant if I allow it. I won't do consulting by mail.
Estadísticas
15 Preguntas
7.511 Respuestas
62 Archivos
Cody5 Problemas
140 Soluciones
CLASIFICACIÓN
10
of 289.756
REPUTACIÓN
21.203
CONTRIBUCIONES
15 Preguntas
7.511 Respuestas
ACEPTACIÓN DE RESPUESTAS
46.67%
VOTOS RECIBIDOS
4.591
CLASIFICACIÓN
4 of 19.582
REPUTACIÓN
64.810
EVALUACIÓN MEDIA
4.80
CONTRIBUCIONES
62 Archivos
DESCARGAS
1270
ALL TIME DESCARGAS
583953
CLASIFICACIÓN
1.435
of 144.136
CONTRIBUCIONES
5 Problemas
140 Soluciones
PUNTUACIÓN
1.566
NÚMERO DE INSIGNIAS
7
CONTRIBUCIONES
0 Publicaciones
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0 Público Canales
EVALUACIÓN MEDIA
CONTRIBUCIONES
1 Tema destacado
MEDIA DE ME GUSTA
8
Top ten contributors whose answers received the most acceptances in 2023
Awarded to John D'Errico on 01 Jan 2024
1 of your answers has been picked for excellence by MATLAB Answers Editors
Awarded to John D'Errico on 17 Mar 2023
Obtain 50 solvers for a problem you have created
Awarded to John D'Errico on 10 Sep 2020
Like a problem or solution
Awarded to John D'Errico on 13 Oct 2016
Top ten contributors with the most downloaded submissions in 2023
Awarded to John D'Errico on 19 Jan 2024
Top ten contributors with the most downloaded submissions in 2022
Awarded to John D'Errico on 03 Jan 2023
Top ten contributors with the most downloaded submissions in 2021
Awarded to John D'Errico on 06 Jan 2022
Top ten contributors with the most downloaded submissions in 2020
Awarded to John D'Errico on 04 Jan 2021
Answer 50 questions that were unanswered for more than 30 days
Awarded to John D'Errico on 15 Nov 2020
Top ten contributors with the most downloaded submissions in 2019
Awarded to John D'Errico on 02 Jan 2020
Your submissions were downloaded 1000 or more times in a month
Awarded to John D'Errico on 01 Nov 2019
Your submission is selected as "Pick of The Week"
Awarded to John D'Errico on 09 Oct 2019
Feeds
Resuelto
Divisible by 2
This is the first problem in a set of "divisible by x" problems. You will be provided a number as a string and the function you ...
casi 3 años hace
Resuelto
Edges of a n-dimensional Hypercube
Return the number of edges on an <http://en.wikipedia.org/wiki/Hypercube _n_-dimensional hypercube> (with an integer n ≥ 0). ...
alrededor de 6 años hace
Resuelto
Dots in a Circle
Return how many integer grid points there are inside a circle of radius _r_ centred at (0,0) (including points on the edge). ...
alrededor de 6 años hace
Resuelto
The average of the second largest values
Given a matrix, find the average of the second largest values in each row. The same value does not exist on a row. Example: ...
alrededor de 6 años hace
Resuelto
Fibonacci-Sum of Squares
Given the Fibonacci sequence defined by the following recursive relation, * F_n = F_(n-1) + F_(n-2) * where F_0 = 0 and F_1 ...
alrededor de 6 años hace
Resuelto
Volume of a Simplex
Return the volume of a <http://en.wikipedia.org/wiki/Simplex regular _n_-simplex> with a unit side length. Results are up to...
alrededor de 6 años hace
Resuelto
Volume difference between Ellipsoid and Sphere
Given an ellipsoid of semi principal axis (a,b,c) find the volume of the difference between this ellipsoid and the sphere with...
alrededor de 6 años hace
Resuelto
Perimeter
Given a sequence of points forming a closed path (first and last points are coincident) return the perimeter value. For example...
alrededor de 6 años hace
Resuelto
Return the Fibonacci Sequence
Write a code which returns the Fibonacci Sequence such that the largest value in the sequence is less than the input integer N. ...
alrededor de 6 años hace
Resuelto
Find nearest prime number less than input number
Find nearest prime number less than input number. For example: if the input number is 125, then the nearest prime number whi...
alrededor de 6 años hace
Resuelto
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...
alrededor de 6 años hace
Resuelto
Extra safe primes
Did you know that the number 5 is the first safe prime? A safe prime is a prime number that can be expressed as 2p+1, where p is...
alrededor de 6 años hace
Resuelto
Pernicious Anniversary Problem
Since Cody is 5 years old, it's pernicious. A <http://rosettacode.org/wiki/Pernicious_numbers Pernicious number> is an integer w...
alrededor de 6 años hace
Resuelto
Get linearly independent vectors of given matrix.
Get a set of linearly independent vectors from the rows of a given matrix. Example matrix=[ 3 -1 0 0 ; ...
más de 7 años hace
Problema
Euclidean distance from a point to a polynomial
A not uncommon problem in the area of computational geometry is to find the closest point to a straight line from a given point,...
más de 7 años hace | 3 | 28 solvers
Resuelto
For given xx,x, y vectors build spline of x and y and find yy values for xx vector.
For given xx,x, y vectors build spline of x and y and find yy values for xx vector. Example x = [ 1.0000 1.5000 2.00...
más de 7 años hace
Resuelto
What's size of TV?
Many people buy TV. Usually they ask about diagonal. But also important are width and height. Let's assume that all TV have rati...
más de 7 años hace
Problema
Euclidean inter-point distance matrix
The Euclidean distance between two points in a p-dimensional space is a really common thing to compute in the field of computati...
más de 7 años hace | 1 | 24 solvers
Resuelto
Prime number removal
remove all prime numbers from the input e.g. input = 1 2 3 4 5 6 7 8 9 10 11 12 ...
más de 7 años hace
Resuelto
Determine the roots of a cubic equation
Given the coefficients a, b, c, and d of a cubic equation, a*x^3 + b*x^2 + c*x + d = 0, determine its roots.
más de 7 años hace
Resuelto
Roots of a quadratic equation.
Calculate the roots of a quadratic equation, given coefficients a, b, and c, for the equation a*x^2 + b*x + c = 0.
más de 7 años hace
Resuelto
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 = ...
más de 7 años hace
Problema
Simpsons's rule (but not Homer Simpson)
I wonder what Homer Simpson would have thought of Simpson's rule? Somehow I doubt his thoughts would have included the phrase Ne...
más de 7 años hace | 4 | 36 solvers
Resuelto
Right and wrong
Given a vector of lengths [a b c], determines whether a triangle with those sides lengths is a right triangle: <http://en.wikipe...
más de 7 años hace
Resuelto
Make a Palindrome Number
Some numbers like 323 are palindromes. Other numbers like 124 are not. But look what happens when we add that number to a revers...
más de 7 años hace
Resuelto
Solve the Sudoku Row
*Description* A simple yet tedious task occurs near the end of most Sudoku-solving algorithms, computerized or manual. The ta...
más de 7 años hace
Resuelto
Sums of cubes and squares of sums
Given the positive integers 1:n, can you: 1. Compute twice the sum of the cubes of those numbers. 2. Subtract the square...
más de 7 años hace
Problema
Sums of cubes and squares of sums
Given the positive integers 1:n, can you: 1. Compute twice the sum of the cubes of those numbers. 2. Subtract the square...
más de 7 años hace | 9 | 239 solvers
Resuelto
Project Euler: Problem 6, Natural numbers, squares and sums.
The sum of the squares of the first ten natural numbers is, 1^2 + 2^2 + ... + 10^2 = 385 The square of the sum of the first ...
más de 7 años hace
Resuelto
Determine Whether an array is empty
Input a matrix x, output y is TRUE if x is empty, otherwise FALSE.
más de 7 años hace
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