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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)

4 días 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...

5 días 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...

6 días 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...

24 días 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{:}; ...

25 días ago | 0

| accepted

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...

25 días ago | 0

| accepted

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...

25 días 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 [...

26 días 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 ==...

26 días 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 ...

26 días 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....

alrededor de 1 mes ago | 0

| accepted

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 ...

alrededor de 1 mes 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...

alrededor de 1 mes 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)); ...

alrededor de 1 mes ago | 0

| accepted

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...

alrededor de 1 mes ago | 0

| accepted

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

alrededor de 1 mes 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...

alrededor de 1 mes 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(...

alrededor de 1 mes 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)...

alrededor de 1 mes 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); ...

alrededor de 1 mes ago | 0

| accepted

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 ...

alrededor de 1 mes 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...

alrededor de 1 mes ago | 0

| accepted

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...

alrededor de 1 mes 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] ...

alrededor de 1 mes ago | 1

| accepted

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...

alrededor de 1 mes 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...

alrededor de 1 mes ago | 0

| accepted

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...

alrededor de 1 mes ago | 0

| accepted

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 ...

alrededor de 1 mes ago | 0

| accepted

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] ...

alrededor de 1 mes ago | 1

| accepted

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

alrededor de 1 mes ago | 0

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