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# David Verrelli

927 total contributions since 2015

http://www.research.div1.com.au/
Highest Cody ranking = 42nd (10000 points, in July 2018).

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Solved

What score did they give?

7 mois 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...

environ un an ago

Problem

What score did they give?

plus d'un an ago | 0

Solved

Create tangent function out of sin and cos

plus d'un an ago

Solved

How to Concatenate two strings?
How to Concatenate two strings?

plus d'un an ago

Solved

Create a function without inputs that adds one to the output every time it is called. A different possibility of solving this ha...

plus d'un an 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...

plus d'un an 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 ...

plus d'un an 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) ...

plus d'un an 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'.

plus d'un an ago

Solved

Analyze observation data
Suppose you have the following data (A,B,C) in three-column format. A B C -------------------------- t=1 ...

plus d'un an 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...

plus d'un an 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...

plus d'un an ago

Solved

Get Cody's screen size
Return an object that helps this problem's test suite return Cody's screen size.

plus d'un an ago

Solved

Create a function that subtracts a from b if a and b are integers and adds them if they are floats.

plus d'un an ago

Solved

Circumscribed Pentagon?
Building off of <https://www.mathworks.com/matlabcentral/cody/problems/44368 Problem 44368>, your function will be provided with...

plus d'un an 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)

plus d'un an 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...

plus d'un an 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...

plus d'un an ago

Solved

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...

plus d'un an 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 ...

plus d'un an ago

Solved

Count given word x in text.
Count how many times given word x repeats in text.

plus d'un an ago

Solved

Save variables
a=[1] Save variable a that is located in workspace into current folder. File name should be 'a.mat'

plus d'un an 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]...

plus d'un an 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...

plus d'un an 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...

plus d'un an ago

Solved

Calculate solution of given polynomial
For example, y=function([3 -2 -4]) In here, input vector indicate 3*x^2-2*x-4, y is solution of former equation. y=[1.5...

plus d'un an ago

Solved

i forgot to use capital I
When referring to yourself you should write "I" (capital) and not "i". So correct the input string x, but be aware that other u...

plus d'un an ago

Solved

Calculate cosine without cos(x)
Solve cos(x). The use of the function cos() and sin() is not allowed.

plus d'un an ago

Solved

Can we make a triangle?
Given three positive number, check whether a triangle can be made with these sides length or not. remember that in a triangle su...

plus d'un an ago