Stephan
Last seen: 1 dag ago
1.200 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
Your submissions were downloaded 10 or more times in a month
Awarded to Stephan on 01 Nov 2019
Publish your first comment or rating
Awarded to Stephan on 09 Oct 2019
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
Awarded to Stephan on 04 Sep 2018
Answer 10 questions that were unanswered for more than 30 days
Awarded to Stephan on 22 Jun 2018
Be the first to solve a problem
Awarded to Stephan on 24 Apr 2018
Create a problem
Awarded to Stephan on 24 Apr 2018
Provide your first answer ever to someone else's question
Awarded to Stephan on 26 Dec 2017
Comment on a problem or solution
Awarded to Stephan on 08 Jun 2017
Like a problem or solution
Awarded to Stephan on 08 Jun 2017
Solve a problem for the first time
Awarded to Stephan on 07 Jun 2017
ODE solvers - passing parameters
<https://de.mathworks.com/help/optim/ug/passing-extra-parameters.html>
10 dagen ago | 0
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 = ...
12 dagen ago | 0
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)] ...
13 dagen ago | 0
How to multiply three scalar value one by one to other five scalar value and get all the results in Simulink
[1 2 3] .* [3 5 7 9]'
20 dagen ago | 0
Solving Integral via MATLAB!!
syms a b z eq = (a-z) / ((1+z)*(b+z)); pretty(eq) sol = int(eq,z); pretty(sol)
22 dagen ago | 0
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;...
23 dagen ago | 0
| accepted
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 ...
23 dagen ago | 0
| accepted
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...
26 dagen ago | 0
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 .*...
28 dagen ago | 0
| accepted
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"]...
ongeveer een maand ago | 0
| accepted
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...
ongeveer een maand ago | 0
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...
ongeveer een maand ago | 0
| accepted
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...
ongeveer een maand ago | 0
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...
ongeveer een maand ago | 0
| accepted
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...
ongeveer een maand ago | 0
Error using bar (line 172) X must be same length as Y.
Transpose y: x = 1990; y = [10 20 30]'; bar(x,y)
ongeveer een maand ago | 0
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...
ongeveer een maand ago | 0
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...
ongeveer een maand ago | 0
| accepted
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...
ongeveer 2 maanden ago | 0
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 maanden 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...
2 maanden 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...
2 maanden 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...
2 maanden 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 maanden 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)
3 maanden 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)
3 maanden 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...
3 maanden 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...
3 maanden 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...
4 maanden ago | 1
| accepted
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