Stephan
Last seen: Today
1.223 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
Vectors must be the same length.
You overwrite X: A=[2,1;2,-1] B=[1;7] d=det(A) X=inv(A)*B A*X %X=-2:0.5:2; Y1=(-2*A+1)/1; Y2=(-2*A+7)/(-1); plot(X,Y1,X...
etwa 5 Stunden ago | 0
Solving a function with fsolve
VaR_NE = fsolve(@NEcdf,0) function fx = NEcdf(x) alpha_VaR=0.99; hetta_RL=-0.0047; omega_RL=0.0077; delta_RL=0.0041; fx ...
ein Tag ago | 0
Solving a symbolic system of equations
Try: % Equillateral Strain Rosette Problem % angle values (A = 0, B = 120; C =60; seems to be standard for a 60 degree % eq...
3 Tage ago | 1
| accepted
Why should I use the zeros function?
It is for performance reasons: https://de.mathworks.com/help/matlab/matlab_prog/preallocating-arrays.html
4 Tage ago | 1
Input arguments error on line 2
Divide your code into a function for your ode and the part for solving and plottting the results: y0 = 0; % --> change to 1 for...
4 Tage ago | 0
| accepted
what is wrong?
Typo - it is cos instead of cox, and the usage of '.*' elementwise multiplication x=-3:0.1:3 y=sin(x).*cos(2*x)+1 plot(x,y)
4 Tage ago | 0
Asking for help with syntax for fmincon
The solvers in Matlab accept only one vector as variable. So change y(1) --> x(3) and y(2) --> x(4). Then edit the code this way...
5 Tage ago | 0
| accepted
Calculate the population mean of several probability distributions
Du kannst das direkt in der Schleife machen, in dem Du die benötigten Felder der struct ansprichst und die interessierenden Wert...
5 Tage ago | 0
Subscript in figure WHAT AM I DOING WRONG?
<https://de.mathworks.com/matlabcentral/answers/157122-latex-interpreter-mean-bar-with-subscripts>
5 Tage ago | 0
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How get the Adjacency matrix from complete graph
Its trivial: A = ones(n) - diag(diag(ones(n))) or, more easy A = ones(n) - eye(n)
6 Tage ago | 0
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basic error, help me
2 closing brackets missing, one '*' operator missing, one times use './' instead of '/': x = linspace(20,100000); y = 20*log1...
6 Tage ago | 0
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Splitting an array up
use this before reshaping - it discards all data, you dont care about: x = x(:,1:40*2048)
6 Tage ago | 0
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How do I simplify the values of a function?
Can be done with symbolic toolbox - matlabFunction returns an anonymous function the way you want: syms x % known constants a...
6 Tage ago | 0
how can I write more than 1 objective in linprog line
You can not do this in linprog. See here instead: https://de.mathworks.com/help/optim/multiobjective-optimization.html If you ...
7 Tage ago | 0
How to permute binary numbers to a specific permutation
https://de.mathworks.com/help/matlab/ref/circshift.html F=[0 6 2 5 4 3 6 1]' A = dec2bin(F) B = circshift(A,1,2) gives: F =...
8 Tage ago | 0
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I need help fixing an error that pops up when running my code. "Undefined function or variable 't'.
Seee the code below: % [Car B] is traveling a distance d ahead of [Car A]. Both cars are traveling % at the same initial veloc...
8 Tage ago | 0
How to Create an Anonymous Function?
Try to write it in one line - i guess you use an older release of Matlab, that does not support the semicolon operator in a seco...
8 Tage ago | 0
Solving nonlinear second order diferential equation
%% Dados iniciais clear Massa_foguete_seco = 3000; % Kg Massa_combustivel_inicial = 3000; % kg Empuxo ...
10 Tage ago | 0
2D Histogram aus 2 Matrizen
Immer dann, wenn in A oder B eine 0 vorkommt, wird g_a oder eben g_b gleich Null. Wenn dann im nächsen Schritt versucht wird, H_...
11 Tage ago | 0
| accepted
population size of pso in matlab
You find it here: https://de.mathworks.com/help/gads/particleswarm.html?s_tid=srchtitle#budidgf-options The entry is in the th...
11 Tage ago | 0
| accepted
Storing values in a matrix
% Constants m=15; l=2; g=9.81; d=l/2; Io=(1/3)*m*(l^2); wn=sqrt((m*g*d)/Io); % function handle for linearized ode Vib_...
11 Tage ago | 0
ODE solvers - passing parameters
<https://de.mathworks.com/help/optim/ug/passing-extra-parameters.html>
etwa ein Monat 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 = ...
etwa ein Monat 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)] ...
etwa ein Monat 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]'
etwa 2 Monate 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)
etwa 2 Monate 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;...
etwa 2 Monate 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 ...
etwa 2 Monate ago | 0
| accepted
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