Stephan
Last seen: Today
1.180 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 24 consecutive months
Awarded to Stephan on 03 Apr 2020
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Publish your first submission
Awarded to Stephan on 09 Oct 2019
Solve all the problems in Introduction to MATLAB problem group
Awarded to Stephan on 28 Jan 2019
Accept 5 answers given by other contributors
Awarded to Stephan on 11 Oct 2018
100 of your answers have been accepted
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Answer 10 questions that were unanswered for more than 30 days
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Awarded to Stephan on 08 Jun 2017
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Awarded to Stephan on 07 Jun 2017
How to use fsolve when a nonlinear equation given two arrays of parameters (not the variables)? Why can't I use for loop?
Hi, you could try to vectorize your function in order to avoid for loops - here is a simple example: % Constant 1 as a row vec...
12 Tage ago | 0
Question about GA and the fun.
Have a read here: https://de.mathworks.com/help/optim/ug/passing-extra-parameters.html In your case it should look somehow lik...
12 Tage ago | 2
| accepted
Help me I am unable to input array
They way you coded it needs to enter the single values one after each other: Enter elements of x=1 Enter elements of x=2 Ente...
13 Tage ago | 0
| accepted
Problems using LSTM with PPO Agent - Error: Invalid input argument type or size such as observation, reward, isdone or loggedSignals.
I finally could solve the issue. The problem was that there were 2 LSTM layers in the network, which led to the error: Caused b...
17 Tage ago | 0
| accepted
Question
Problems using LSTM with PPO Agent - Error: Invalid input argument type or size such as observation, reward, isdone or loggedSignals.
Hi, i implemented some RL agents (DQN, AC, PPO...) successfully with my custom environment function by using a feedforward netw...
18 Tage ago | 1 answer | 0
1
answernumerically solving an equation involving a matlab function with multiple variables
fun = @(x) blsprice(5,2,0.05,x,0.2) - 4; unknown_time = fsolve(fun,0.5)
etwa ein Monat ago | 1
| accepted
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)
etwa ein Monat ago | 0
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...
etwa ein Monat ago | 1
| accepted
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...
etwa ein Monat ago | 0
| accepted
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...
etwa 2 Monate ago | 1
| accepted
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{:}; ...
etwa 2 Monate ago | 0
| accepted
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...
etwa 2 Monate ago | 0
| accepted
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...
etwa 2 Monate ago | 0
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 [...
etwa 2 Monate ago | 0
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 ==...
etwa 2 Monate ago | 0
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 ...
etwa 2 Monate ago | 0
IMRT Beam angle optimization
You might want to read the dissertation from Mark Bangert, which includes a rich bibliography: http://archiv.ub.uni-heidelberg....
2 Monate ago | 0
| accepted
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 ...
2 Monate ago | 1
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...
2 Monate ago | 0
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)); ...
2 Monate ago | 0
| accepted
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...
2 Monate ago | 0
| accepted
Environment Reinforcment learning Matlab
See this link to the documentation: https://de.mathworks.com/help/reinforcement-learning/ug/create-custom-reinforcement-learnin...
2 Monate ago | 0
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...
2 Monate ago | 0
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(...
2 Monate ago | 1
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)...
2 Monate ago | 0
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); ...
2 Monate ago | 0
| accepted
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 ...
2 Monate ago | 1
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...
2 Monate ago | 0
| accepted
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...
2 Monate ago | 0
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] ...
2 Monate ago | 1
| accepted
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