Stephan
Last seen: Today
1 510 total contributions since 2017Knowledge means knowing where it is written...
Interested in:
- Optimization
- Mathematical Modelling
- Improvement of my programming skills
Stephan's Badges
Contribute at least one answer each month for 36 consecutive months
Awarded to Stephan on 02 Apr 2021
Accept 5 answers given by other contributors
Awarded to Stephan on 11 Oct 2018
Obtain 50 solvers for a problem you have created
Awarded to Stephan on 11 Dec 2020
Solve all the problems in Introduction to MATLAB problem group
Awarded to Stephan on 28 Jan 2019
Be the first to solve a problem
Awarded to Stephan on 24 Apr 2018
Your submissions were downloaded 10 or more times in a month
Awarded to Stephan on 01 Nov 2019
Publish your first comment or rating
Awarded to Stephan on 09 Oct 2019
Publish your first submission
Awarded to Stephan on 09 Oct 2019
100 of your answers have been accepted
Awarded to Stephan on 04 Sep 2018
Answer 10 questions that were unanswered for more than 30 days
Awarded to Stephan on 22 Jun 2018
Create a problem
Awarded to Stephan on 24 Apr 2018
Provide your first answer ever to someone else's question
Awarded to Stephan on 26 Dec 2017
Comment on a problem or solution
Awarded to Stephan on 08 Jun 2017
Like a problem or solution
Awarded to Stephan on 08 Jun 2017
Creation of a black and white image
image=zeros(512,512); image(206:305,206:305)=255; imshow(image)
5 jours ago | 0
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From symbolic to numerical results for quadratic equation
You could use symbolic functions: syms y(a,b,x) y(a,b,x) = a*x^2 - b*x % Calculate values for a=1, b=2 and x in a range from...
5 jours ago | 0
| accepted
Create an equally spaced vector when taking the sine of another vector
p_inv = linspace(-1,1,25); theta = asin(p_inv); p = sin(theta); diff(p) % Is p equally spaced? scatter(p,theta)
5 jours ago | 0
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Comparing 2 frames from video
Try: function [P,MSE]=Untitled(original_img,stego_img) original_img=double(original_img); stego_img=double(stego_img); if ...
5 jours ago | 0
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I am unable to find pv array in 2014b please help me to find it.
PV Array was introduced with R2015a - you can not find it in R2014b - see the link. Are you sure your friends version is 2014a? ...
7 jours ago | 0
HOW TO SOLVE 2 EQUATION ODE USING ODE45 IN MATLAB?
f = @(t,y) [0.303*y(1)-0.557*y(1).^2+0.260*y(2).*y(1);... 0.0345*y(2)-1.18e-7*y(2).^2+3.55e-14*y(1).*y(2)]; Y0 = [0.0718,0...
14 jours ago | 0
How to plot parametric curve
https://de.mathworks.com/help/matlab/ref/fplot.html#bu6xntl-12
19 jours ago | 0
Get mean and stdev from all values
Use a table and then use findgroups combined with splitappy. This will allow you to solve the problem with a few lines of code. ...
19 jours ago | 0
Vectors must be the same length.
Change line 1: t=linspace(0,1,256); fc=60; fm=15; ac=1; am=1; wc=2*pi*fc; wm=2*pi*fm; mt=am*cos(wm*t); m_ac=ac*cos(wc...
20 jours ago | 0
hello everyone. How to divide a group of points named data into two parts, dataA and dataB, as shown in the figure. Thank you very much.
% divide data idx = clusterdata(data,2); dataA = data(idx==2,:); dataB = data(idx==1,:); % plot results scatter(dataA(:,1...
20 jours ago | 0
| accepted
element wise operation column matrix
Temp_data= [20;27;29;33;40] Case_1 = Temp_data - Temp_data(1) Case_2 = diff(Temp_data)
28 jours ago | 0
Return the number of rows of an array
A = [10 20 30 40 50 60 70 80 90 100] B = A(A<50)
28 jours ago | 0
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Getting wrong sine wave for frequency 10KHz
Think about your sampling rate: f = 10000; t = 0:1/(25*f):0.002; plot(t,sin(2*pi*f.*t))
28 jours ago | 0
split matrix into two based on column values
A = [ 1 2 1.4; 1 3 1.4; 2 5 1.4; 1 5 81; 3 4 1.4; 5 4 81] A1 = A(A(:,end)>80,:) A2 = A(A(:,end)<=80,:)
28 jours ago | 0
| accepted
How to change the direction of x axis.
A = imread('ngc6543a.jpg'); imshow(A) B = fliplr(A); imshow(B)
environ un mois ago | 1
Why can't a circle be detected in such an obvious image?
Use a range for radius input argument such as: [centers1,radii1] = imfindcircles(img,[50 200],'Sensitivity',0.85,'ObjectPolarit...
environ un mois ago | 0
Help with solving a system of equations
Please check carefully if this is correct and if it is what you need: %% Case 1: N = 19 % clc % clear % b = 6; % Vinf = 1...
environ un mois ago | 1
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Audioread Function Error.
Re-Install your Matlab version if you are not able to undelete the file. There is no other legal way to help you, because it is ...
environ un mois ago | 0
How to set Assumptions for function handle?
See fimplicit3 example here and use interval argument: f = @(x,y,z)x.^2+y.^2+z.^2-1; fimplicit3(f, [-1, 1, -1, 1, 0, 1])
environ un mois ago | 0
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Loop function takes too long. How can I reduce the processing time?
Yes, diff in as inbuilt and vectrorized function to get what you want. Run this command on a vector input will give you all the ...
environ un mois ago | 0
Splitting code into groups
Note that the run button will run all your code in one, while the other buttons will run you code section wise and go / go not t...
environ un mois ago | 0
Solution to a simple equation
use isolate instead of solve: clear all; close all; syms R L C omega eqn=1 - 2*C*L*omega^2 + C^2*R^2*omega^2 + C^2*L^2*omega^...
environ un mois ago | 0
| accepted
how to make a function of this system
syms a b y1(t) y2(t) ode(1,1) = diff(y1,t,2) == a*y2 - cos(diff(y1,t)); ode(2,1) = diff(y2,t) == b*y1 + cos(t) [V,S] = od...
environ un mois ago | 1
error with plotting graph
Since theta is a vector you need to perform elementwise multiplication: a = 13; c = 17; k = 2*pi/3; theta = 0:0.0001:2*pi; ...
environ un mois ago | 1
Getting error with the code in ode45 function
t=[0 5]; inity = 1; [t,y]=ode45(@f, t, inity); plot(t,y) function dy = f(~,y) % y=[9,100]; dont overwrite y D=0.00000001; ...
environ un mois ago | 0
| accepted
How can I plot the Temperature distribution in this code.
Play arround with slice: % LBM 3D - D3Q15 Heat Diffusion in a Plate % Problem - 5.10 clc clear variables close all alpha =...
environ un mois ago | 1
| accepted
How to multiply a matrix to another cell matrix
Use cellfun: A = magic(3) C = {rand(3,4); rand(3,4); rand(3,4); rand(3,4); rand(3,4)} result = cellfun(@(x)mtimes(A,x),C,'Uni...
environ un mois ago | 1
| accepted
Why do the ode45 solver is not running in my code?
Your problem appears to be stiff - use ode15s instead: clear; clc; a = 1; %alpha p = 7.5; %rho b = 4; %beta g = 16; %gamma ...
environ un mois ago | 0
| accepted
i'm getting this error "Unable to perform assignment because the left and right sides have a different number of elements"
Problem 1 h returns more than one solution which produces the error because the result of xa1(i+1)=I2(i)+h*S2(1) with h bein...
environ un mois ago | 1
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