# David Verrelli

http://www.research.div1.com.au/

Highest Cody ranking = 42nd (10000 points, in July 2018).

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**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. ...

3 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...

3 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...

3 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...

3 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