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Stephan


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1,505 total contributions since 2017

Knowledge means knowing where it is written...

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Answered
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...

6 days ago | 0

Answered
How to plot parametric curve
https://de.mathworks.com/help/matlab/ref/fplot.html#bu6xntl-12

11 days ago | 0

Answered
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. ...

11 days ago | 0

Answered
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...

12 days ago | 0

Answered
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...

12 days ago | 0

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Answered
element wise operation column matrix
Temp_data= [20;27;29;33;40] Case_1 = Temp_data - Temp_data(1) Case_2 = diff(Temp_data)

20 days ago | 0

Answered
Return the number of rows of an array
A = [10 20 30 40 50 60 70 80 90 100] B = A(A<50)

20 days ago | 0

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Answered
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))

20 days ago | 0

Answered
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,:)

20 days ago | 0

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Answered
How to change the direction of x axis.
A = imread('ngc6543a.jpg'); imshow(A) B = fliplr(A); imshow(B)

24 days ago | 1

Answered
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...

25 days ago | 0

Answered
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...

25 days ago | 1

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Answered
How to calculate NDI Index
NDI_new = uint8(rescale(NDI, 0, 255));

26 days ago | 0

Answered
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 ...

26 days ago | 0

Answered
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])

26 days ago | 0

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Answered
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 ...

26 days ago | 0

Answered
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...

27 days ago | 0

Answered
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^...

28 days ago | 0

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Answered
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...

29 days ago | 1

Answered
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; ...

29 days ago | 1

Answered
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; ...

1 month ago | 0

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Answered
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 =...

1 month ago | 1

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Answered
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...

1 month ago | 1

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Answered
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 ...

1 month ago | 0

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Answered
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...

1 month ago | 1

Answered
All possible combination based on 2^n
n = 3 ff2n(n)

1 month ago | 0

Answered
percent of similarity between images
When using a neural net you could use the score output argument to get this. Look at this example there is a bar chart based on ...

1 month ago | 0

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Answered
How I can append matrices of different dimensions in another matrix?
A = randi(10, 3, 1) B = rand(4, 1) C = randi(10,5,1) D = vertcat(A,B,C)

1 month ago | 0

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Answered
Checking if 2 edges in a graph are connected
You could use the neighbors function, which gives a list of connected nodes for a given node. You could combine this with the is...

1 month ago | 0

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Answered
hi guys, I want to make a spectral RollofPoint of speech and when I enter this code from mathworks, I get this error that the variable t1 is not declared, even though I declared it. Please I will be happy for every piece of advice.
You have to run code so that the variables appear in your workspace. go to the editor tab and press "run". the editor tab appear...

1 month ago | 0

| accepted

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