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Stephan


Last seen: Today
1,200 total contributions since 2017

Knowledge means knowing where it is written...

Interested in:
- Optimization
- Mathematical Modelling
- Improvement of my programming skills

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Contributions in
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Answered
ODE solvers - passing parameters
<https://de.mathworks.com/help/optim/ug/passing-extra-parameters.html>

8 days ago | 0

Answered
Matlab code for solving the following system equation
>> A = [2 1 5; 2 2 3; 1 3 3] A = 2 1 5 2 2 3 1 3 3 >> b = [5; 7; 6] b = ...

10 days ago | 0

Answered
How to solve a LPP when the A of linprog does not form a square matrix? I have 5 variables and 2 constraints.
% define all constraints A = [2, 2, 2, 0.6, 0.3; 0 0.04, 0.08, 0.09, 0.135; -eye(5)] b = [750, 30.75, zeros(1,5)] ...

11 days ago | 0

Answered
Solving Integral via MATLAB!!
syms a b z eq = (a-z) / ((1+z)*(b+z)); pretty(eq) sol = int(eq,z); pretty(sol)

20 days ago | 0

Answered
I can not plot values
syms Frx B m V1 V2 P1g P2g Frz alfa1 A1 V M Degree Fr W Weight m1=18;B1=1;P1g=0;V1=250;A1=1;alfa1=0; m2=m1;B2=B1;P2g=0;V2=250;...

21 days ago | 0

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Answered
Reinforcement Learning toolbox step function
The action the agent has choosen in the last step, usually has an impact on the environment. To let the step function know what ...

21 days ago | 0

| accepted

Answered
Why is this break not executing for the summation of pi
You never reach the value of your ratio of PrevSum/pie. I inserted 2 lines, the first saves the ratio in every single run of you...

24 days ago | 0

Answered
Making a row vector
v = [0:100 ,100:-5:0]

24 days ago | 1

| accepted

Answered
Solve equation in matlab
% rewrite equation to be equal to zero for fsolve and save as a function handle eqn = @(beta, L) cos(beta .* L) .* cosh(beta .*...

26 days ago | 0

| accepted

Answered
How to remove first consonant/consonant cluster and add it to the end?
Here is a little function, that can do this a = ["desk", "hello", "cup", "switch", "smith", "flowers", "angry", "decorations"]...

1 month ago | 0

| accepted

Answered
Shape Interpolation from csv
If the curvature is small enough compared to the distance between the original points, a little bit of analytical geometry might...

1 month ago | 0

Answered
Aligning columns in a matrix by padding with zeros
Under the assumption that you have at least one not corrupted column (here column 2), this might work: A = [1698 1696 1699 1...

1 month ago | 0

| accepted

Answered
How to avoid the ending drop of the movmean curve?
Use the Endpoints option: data = [386 379 295 238 159 190 384 402 552 347 463 259 412 481 523 589 611 479 320 403 642]; window...

1 month ago | 0

Answered
help with a vibratonal analysis code
m1=53;% Mass m2=62.096; k=3.096e+006 ; % Stiffness c=150; % Damping % 4 x 4 matrices disp('4 x 4 Mass matrix'); mt=[c,0,m1...

1 month ago | 0

| accepted

Answered
Not able to integrate a matrix.
You missed to define some values, for generality i setted them to be symbolic variables. Also integral is a function for numeric...

1 month ago | 0

Answered
Error using bar (line 172) X must be same length as Y.
Transpose y: x = 1990; y = [10 20 30]'; bar(x,y)

1 month ago | 0

Answered
Obtaining Information from Reinforcement Learning while Training
The reward of each training episode is stored in the trainsStats struct which is the output argument of the train function. Insi...

1 month ago | 0

Answered
How to display Y, Cb and Cr components of an image?
I used the inbuild example file peppers_RGB_tiled.tif, which has no 4rd dimension that could be cleared, so i used a try catch b...

1 month ago | 0

| accepted

Answered
solve: Cannot find explicit solution but it have solutions, matlab's bug?
Congratulations, you have 1 solution of an infinite number of possible solutions - look to the borderline case of equal to: sym...

1 month ago | 0

Answered
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...

2 months ago | 0

Answered
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...

2 months ago | 2

| accepted

Answered
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...

2 months ago | 0

| accepted

Answered
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...

2 months ago | 1

| 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...

2 months ago | 1 answer | 0

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answer

Answered
numerically 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)

3 months ago | 1

| accepted

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)

3 months 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 months 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...

3 months 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...

3 months ago | 1

| accepted

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