David Verrelli
http://www.research.div1.com.au/
Highest Cody ranking = 42nd (10000 points, in July 2018).
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AVERAGE NO. OF LIKES
Answer 1 question that was unanswered for more than 30 days
Awarded to David Verrelli on 20 Jul 2017
Provide your first answer ever to someone else's question
Awarded to David Verrelli on 20 Jul 2017
Receive 10 likes on a problem you have created
Awarded to David Verrelli on 16 Dec 2020
Receive 25 likes on a problem you have created
Awarded to David Verrelli on 06 Sep 2020
Publish your first review
Awarded to David Verrelli on 09 Oct 2019
Solve all the problems in Tiles Challenge
Awarded to David Verrelli on 09 Jun 2018
Solve all the problems in Indexing I
Awarded to David Verrelli on 01 Jun 2018
Solve all the problems in ASEE Challenge
Awarded to David Verrelli on 25 May 2018
Solve all the problems in Cody Challenge
Awarded to David Verrelli on 21 Apr 2018
Solve 500 problems
Awarded to David Verrelli on 11 Feb 2018
Create 10 problems
Awarded to David Verrelli on 03 Dec 2017
Solve all the problems in Cody5:Easy
Awarded to David Verrelli on 15 Nov 2017
Content Feed
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. ...
4 months 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...
4 months ago
Solved
Comparison of floating-point numbers (singles)
Floating-point numbers cannot generally be represented exactly, so it is usually inappropriate to test for 'equality' between tw...
4 months ago
Problem
Guess the number I'm thinking of (Part 2)
Have you tried the original "Guess the number I'm thinking of" (Problem 44630)? This problem is just like that, except that the...
5 months ago | 1 | 3 solvers
Solved
What score did they give?
Your task in this problem is to figure out the most recent score, |S|, submitted. <<https://upload.wikimedia.org/wikipedia/...
2 years ago
Solved
Combine the first and last names
MATLAB R2016 provides a rich set of functions to work with string arrays. In this problem, you will be given two string arrays o...
3 years ago
Problem
What score did they give?
Your task in this problem is to figure out the most recent score, |S|, submitted. <<https://upload.wikimedia.org/wikipedia/...
3 years ago | 1 | 8 solvers
Solved
Persistence will not help you solve this problem.
Create a function without inputs that adds one to the output every time it is called. A different possibility of solving this ha...
3 years ago
Solved
Calculate correlation.
There are two data. y1=[0 1 2 3 4]' y2=[2 3 4 5 6]' We can see positive relationship between y1 and y2. The relations...
3 years ago
Solved
Implement zero-based indexing for Matrices
Given an input vector and position (which is zero based) output the value Example: x = [1 2; 4 5] pos = [0 1] value = 5 ...
3 years ago
Solved
Make roundn function
Make roundn function using round. x=0.55555 y=function(x,1) y=1 y=function(x,2) y=0.6 y=function(x,3) ...
3 years ago
Solved
Replace x value into y value in string text.
Replace x value into y value in string text. Example text='Hello World' x='World', y='Universe' result='Hello Universe'.
3 years ago
Solved
Analyze observation data
Suppose you have the following data (A,B,C) in three-column format. A B C -------------------------- t=1 ...
3 years ago
Solved
Probabilities - Balls and urns - 02
The urn contains B blue balls and R red balls. Each trial consists of drawing one random ball from the urn and observing its col...
3 years ago
Solved
Solve equation numerically
y'=y In order to solve equation using computer, numerical analysis are needed. 1st order Euler's method is one of the metho...
3 years ago
Solved
Get Cody's screen size
Return an object that helps this problem's test suite return Cody's screen size.
3 years ago
Solved
Subtract integers and add doubles
Create a function that subtracts a from b if a and b are integers and adds them if they are floats.
3 years ago
Solved
Circumscribed Pentagon?
Building off of <https://www.mathworks.com/matlabcentral/cody/problems/44368 Problem 44368>, your function will be provided with...
3 years ago
Solved
Calculate numerical integration.
x=0:0.01:1 y=@(x)x.^2 Using given two inputs(x and y), conduct numerical integration in x. (hint: trapz)
3 years ago
Solved
Tridiagonal matrix
Given vectors u and v, make a tri-diagonal symmetric matrix such that u is in the main diagonal and v is below and above diagona...
3 years ago
Solved
Calculate area of sector
A=function(r,seta) r is radius of sector, seta is angle of sector, and A is its area. Area of sector A is defined as 0.5*(r^2...
3 years ago
Solved
Refresh your system of equations
Given square matrix, and solution vector, find the values of the variables Example: xyz = [1 -1 2; 0 2 5; 4 0 -3]; //x-y+2...
3 years ago
Solved
Solve the system of linear equations
4x - 2y +6z=8 2x + 8y +2z=4 6x + 10y +3z=0 Input is each coefficient of polynomial. For example, a=[4 ...
3 years ago
Solved
Save variables
a=[1] Save variable a that is located in workspace into current folder. File name should be 'a.mat'
3 years ago
Solved
Integrate Me
Given polynomial, output the integral (with k = 1 for simplicity purposes) Example: input = [2 1] % 2x+1 output = [1 1 1]...
3 years ago
Solved
Modified Upper Matrix Mock
Given a vector v=[1 3 6 9 11], turn it into a matrix 'ramp' like so: m=[1 3 6 9 11; 0 3 6 9 11; 0 0 6 9 11; 0 0 0 9 11; 0 0 0...
3 years ago
Solved
Linear Least Squares (L2 fitting problem )
Given a set of real measurements (x(i), y(i)) find a line sol(1)x + sol(2) (more specifically furnish the vector with...
3 years ago
