# Athanasios Paraskevopoulos

### Hellenic Open University

Athanasios is a Teacher of Mathematics with a proven track record of working in education management. Proficient in Ease of Adaptation, Course Design, and Instructional Technology. Strong education professional with a Bachelor's degree with an emphasis in Mathematics from the University of Aegean. Currently, he is pursuing a Master's degree in Applied Mathematics at the Hellenic Open University, with a specific focus on Ordinary and Partial Differential equations. His enthusiasm lies in the application of mathematical models to real-world contexts, such as epidemiology and population growth.

**Programming Languages:**

MATLAB

**Spoken Languages:**

English

**Pronouns:**

He/him

**Professional Interests:**

Mathematics, Numerical Integration and Differential Equations, Partial Differential Equation Toolbox, Stochastic Differential Equation (SDE) Models, Applied Mathematics

**Statistics**

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**Feeds**

Question

Lorenz Attractor Animation with Frame-by-Frame Plotting

I was trying to create an animation of Lorenz Attractor. I used the following code but it did not give me the result I want l...

3 days ago | 1 answer | 0

### 1

answerQuestion

Representation of Gabriel's Horn

By reading the following very interesting paper An Understanding of a Solid with Finite Volume and Infinite Surface Area. ...

21 days ago | 1 answer | 0

### 1

answernonlinear dynamics(Measure synchronization)

Let's first correct and complete the provided code. We need to make sure that the equations, integration, and plot functions are...

2 months ago | 0

How to take input values from users symbolically while running a code?

I think this is what you asked for % Function to generate rotation matrix rot_matrix = @(axis, theta) cos(theta) * eye(3) + .....

2 months ago | 0

Plotting the Evolution of Spatially Localized Initial Conditions for Discrete Klein-Gordon Equation

% Parameters L = 200; % Length of the system K = 99; % Number of spatial points omega_d = 1; % Characteristic frequency b...

2 months ago | 0

| accepted

Question

Plotting the Evolution of Spatially Localized Initial Conditions for Discrete Klein-Gordon Equation

Ιn continuation of the study with which I have been fascinated Numerical Simulation of a Damped, Driven Nonlinear Wave System wi...

2 months ago | 1 answer | 0

### 1

answerPlot legend goes behing plot axes when using tiledlayout

The issue you are experiencing with legends disappearing behind the axes when moved in a tiledlayout can be addressed by setting...

2 months ago | 0

Crank-Nicholson method

The main issue with your code is in the line where you solve the linear system A⋅unew=b. The correct approach is to solve for 𝑢...

2 months ago | 0

Numerical Simulation of a Damped, Driven Nonlinear Wave System with Spatially Extended Initial Conditions

I found it i should remove the discretization parameter because in the following. I understood that @William Rose Thank yo...

3 months ago | 0

| accepted

Question

Plotting Phase Portrait of Duffing Equation

I study a paper that describes a stationary problem where the function satisfies the boundary conditions and is governed by a m...

3 months ago | 1 answer | 1

### 1

answerQuestion

Numerical Simulation of a Damped, Driven Nonlinear Wave System with Spatially Extended Initial Conditions

The study of the dynamics of the discrete Klein - Gordon equation (DKG) with friction is given by the equation : In the abov...

3 months ago | 1 answer | 0

### 1

answerAyers 'Differential Equations Problem 4

syms x y(x) C % Define the differential equation dy_dx = diff(y, x); ode = 4*x*dy_dx^2 + 2*x*dy_dx - y == 0; % Solve the...

3 months ago | 0

plot of riemann surface

To plot a complete Riemann surface for the function, you need to consider the nature of the complex square root function and how...

3 months ago | 0

| accepted

Custom colorbar labeling centered on colors

I tried the folowing code! It is similar with your second graph, but I could replicate the arrows correct. You can edit the cod...

3 months ago | 0

fitcdiscr bug: Why does "ClassNames" now have to be provided in alphanumerical order otherwise accuracy is terrible?

Code with Issue: load fisheriris Mdl = fitcdiscr(meas, species, "ClassNames", flip(unique(species, "stable")), "KFold", 10); ...

3 months ago | 0

plotting the bifurcation diagram of Duffing oscillations in the (x1, omega) plane?

function dx = duffing(t, x) global alpha delta beta F omega dx = [x(2); -delta * x(2) - alpha * x(1) - beta...

3 months ago | 0

How to solve SIR model with using DTM (Differential Transform Method)

function sir_model_dtm() % Parameters alpha = 0.3; % Infection rate beta = 0.1; % Recovery rate N = 1...

3 months ago | 0

Display in the command window

startUpHeight = 299.07; startUpValue = 100; radius = 15; minConstraintX = 50; % Swapped values maxConstraintX = 150; % Sw...

3 months ago | 0

| accepted

Question

Population Growth Model Analysis

Below I tried to solve Population Growth problem, I provide you the mathematical solution. Also, I create MATLAB code, however i...

3 months ago | 1 answer | 0

### 1

answerfrequency equation for multiple degree freedom system

% Define the mass matrix M M = diag([1.8, 6.3, 5.4, 22.5, 54.0]); % Define the damping matrix C C = [10000, -10000, 0, 0, 0...

3 months ago | 0

Solving logistic ode for bacterial population growth

% Parameters r = 0.002; % per second K = 50000; % carrying capacity (assuming a value, as it is not provided) N0 = 1000; %...

3 months ago | 0

Question

Selecting appropriate values for the parameters in the Gierer-Meinhardt activator-inhibitor model

For the following activator-inhibitor system (Alfred Gierer-Hans Meinhardt model), with all constants positive and initial ...

3 months ago | 2 answers | 0

### 2

answersQuestion

Plotting Damped Nonlinear Oscillator

The given system is a damped nonlinear oscillator with a nonlinear resistance, described by the differential equation: where ...

3 months ago | 1 answer | 0

### 1

answerQuestion

Discrete Population Growth Model Plot

Use the detailed, discrete model for population growth that follows a variation of the logistic law: with . Calculate the p...

3 months ago | 0 answers | 0

### 0

answersQuestion

Plotting discrete Klein - Gordon equation (DKG) with friction in DNA

I am exploring the dynamics of the discrete Klein - Gordon equation (DKG) with friction is given by the equation : In the ab...

3 months ago | 1 answer | 0

### 1

answerCalculating the radius of a link budget

Hello! To calculate the cell radius of a link budget, particularly in a telecommunications context like satellite communications...

4 months ago | 0

| accepted

Why isn't my MATLAB plot not showing up?

It looks like the issue with your MATLAB code is related to how you've set up the ranges for plotting the IV curves. In MATLAB...

4 months ago | 0

Solved

Calculate Amount of Cake Frosting

Given two input variables r and h, which stand for the radius and height of a cake, calculate the surface area of the cake you n...

4 months ago