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Stephan


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1,174 total contributions since 2017

Knowledge means knowing where it is written...

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- Improvement of my programming skills

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Answered
I want to get 2d image from a sensor data.What matlab commands convert a dataset to images?
A = rand(100,100) imshow(A) or A = (randi(1500,100,100))-750 image(A)

2 days ago | 0

Answered
How can I name matrices generated by a for loop as Z1,Z2,Z3 ...etc.
There are a lot of contributions (one of the best is here) which show why this way of coding is bad - use an efficient way by in...

3 days ago | 1

| accepted

Answered
Problem with solve matrix
For me your code works: disp('An economic system composed of 3 sectors has the input-output matrix'); D=[0.5,0.1,0.1;0.2,0.5,0...

4 days ago | 0

| accepted

Answered
ode45 solver code for solving a system of three coupled equations does not work
Your ode appears to be stiff - therefore i recommend to use ode15s instead of ode45. Also the behaviour of your system can be se...

23 days ago | 1

| accepted

Answered
i want to read a csv file and store as rows and columns of a cell
fileID = fopen('FOM_HFA_Pavg.csv'); content = textscan(fileID, '%s','Delimiter','\t'); fclose(fileID); content = content{:}; ...

23 days ago | 0

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Answered
calculate and plot the following differential equation using ODE45solver.
y0=0.5; %intial value h=0.8; % t=[0 4]; %tspan [t,y] =ode45(@(t,y)-y+sin(t), t,y0); plot(t,y,'-o'); xlabel('time'); ylabel...

23 days ago | 0

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Answered
using Q learning agent for continuous observation space
You also are allowed to write a custom critic function: https://de.mathworks.com/help/reinforcement-learning/ref/rlqvaluerepres...

23 days ago | 0

Answered
question ..question about engine matlab
Your code works - you only need to call your function and plot the results: % Call the function and save results in W and Fa [...

24 days ago | 0

Answered
Calculate a letter from equation with letters.
You might want to do this: syms Xe Ye a1 a2 cos1 cos2 sin1 sin2 eq(1) = Xe == a2*(cos1*cos2-sin1*sin2)+a1*cos1; eq(2) = Ye ==...

24 days ago | 0

Answered
FZERO cannot continue because user-supplied function_handle ==> @(M)FindM(M,N(k),Q,wn(i)) failed with the error below.
Declare the code in findM_1P as a function and give it proper input and output arguments, to make it possible for fzero passing ...

24 days ago | 0

Answered
IMRT Beam angle optimization
You might want to read the dissertation from Mark Bangert, which includes a rich bibliography: http://archiv.ub.uni-heidelberg....

29 days ago | 0

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Answered
Error in bin2dec ?
You are not doing wrong - just read the documentation: "...If the input argument D has a value greater than the value returned ...

29 days ago | 1

Answered
Combining 3 curves into 1 average
Here is a simple example: % fantasy times times1 = 1:10 times2 = 1:2:11 % fantasy values y1 = 2 * (1:10) y2 = 4 * (1:2:1...

29 days ago | 0

Answered
A problem while using lsqnonlin
Use the same random numbers for the same results: rng('default') d = linspace(0,3); y = exp(-1.3*d) + 0.05*randn(size(d)); ...

29 days ago | 0

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Answered
Not getting six coupled ODEs solution using bvp4c in MATLAB, Please help me
I used nested functions - for 2 of the constants you did not provide values: % Call the outer function finalprogramme %% Ou...

29 days ago | 0

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Answered
Environment Reinforcment learning Matlab
See this link to the documentation: https://de.mathworks.com/help/reinforcement-learning/ug/create-custom-reinforcement-learnin...

1 month ago | 0

Answered
Custom Environment for Reinforcment learning
There is a step-by-step example in the documentaion: https://de.mathworks.com/help/reinforcement-learning/ug/create-custom-rein...

1 month ago | 0

Answered
Please tell me how?
You need to perform a inverse laplace transformation: num=134; den=[1 16 134]; x=tf(num,den) subplot(1,2,1) step(x) title(...

1 month ago | 1

Answered
write function that generates an echo to audio
Hi Franziska, there is no need for loops: % Load sample sound load TestSoundEcho.mat; % Play sample sound sound(data, fs)...

1 month ago | 0

Answered
Output a solution for a function at a specific value input
magT = @(omega)sqrt((5.903*10^24)^2+(1.181*10^20*omega)^2)/sqrt((1.181*10^25-(2.361*10^16*omega^2))^2+(9.445*10^20*omega)^2); ...

1 month ago | 0

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Answered
solving integral in matlab
What you are looking for is an analytical solution. The integral function does solve numeric. To solve symbolic use int as John ...

1 month ago | 1

Answered
Split data into groups
A = randi(5000,300,1); % random data A = sortrows(A); % sort it low = A(1:100); % just use indexing now mid = A(101:200); hi...

1 month ago | 0

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Answered
Syntax error when opening a file using a path. it says " use a newline, semicolon, or comma before this statement "
It is unclear what you want: maybe you forgot to underline your variable name function_data = angleAnalysis_withPlots('C:/rese...

1 month ago | 0

Answered
HELP: looping a function and plot (ode23)
tspan1 = [0, 4]; tspan2 = [4, 10]; y0 = [0, 0]; [t1_r1, y1_r1] = ode23(@(t,y) fun(t,y,0.5,5), tspan1, y0); [t2_r1, y2_r1] ...

1 month ago | 1

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Answered
problem with table / array/cell
Your table content is a cell array - Read the Tips section from the documentation. It tells you why and how to deal with it. ce...

1 month ago | 0

Answered
Solve ODE with BC
I doubt that your ode has an analytical solution - however here is a minimal working example of how to include BC's in a symboli...

1 month ago | 0

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Answered
Respective matrices for different sheets in imported file frin excel
Use the 'sheet' option like shown here: https://de.mathworks.com/help/matlab/ref/readtable.html#d120e1047964 contentTable = rea...

1 month ago | 0

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Answered
I'm trying to integrate, but I get an "undefined function" error.
int does not accept numerical inputs, because it performs symbolic integration - so you have to define a numerical vector for t ...

1 month ago | 0

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Answered
Error using vertcat Dimensions of arrays being concatenated are not consistent. For solving ODE
tspan = [0 60]; %Initial Value C_V0 = 0; %x(1) C_I0 = 0; %x(2) C_C0 = 2; %x(3) C_W0 = 0; %x(4) C_G0 = 0; %x(5) [t,x] ...

1 month ago | 1

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Answered
calling a variable in another function
function [LookupTableFiles]=getaerotablelisting( FilePrefix, DirectoryName , filetype ) FileList = dir('DynamicData...

1 month ago | 0

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