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Stephan


Last seen: Today
1 220 total contributions since 2017

Knowledge means knowing where it is written...

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

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Answered
Why should I use the zeros function?
It is for performance reasons: https://de.mathworks.com/help/matlab/matlab_prog/preallocating-arrays.html

ungefär 22 timmar ago | 1

Answered
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...

en dag ago | 0

| accepted

Answered
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)

en dag ago | 0

Answered
Differentiation for relative sensitivity calculation
D_xN = diff(xN,Nd)

en dag ago | 0

Answered
how to plot this ?
syms x; y=exp(-x).*sin(x); fplot(x,y);

en dag ago | 1

Answered
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...

2 dagar ago | 0

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Answered
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...

2 dagar ago | 0

Answered
Subscript in figure WHAT AM I DOING WRONG?
<https://de.mathworks.com/matlabcentral/answers/157122-latex-interpreter-mean-bar-with-subscripts>

2 dagar ago | 0

Answered
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)

3 dagar ago | 0

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Answered
basic error, help me
2 closing brackets missing, one '*' operator missing, one times use './' instead of '/': x = linspace(20,100000); y = 20*log1...

3 dagar ago | 0

| accepted

Answered
Splitting an array up
use this before reshaping - it discards all data, you dont care about: x = x(:,1:40*2048)

4 dagar ago | 0

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Answered
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...

4 dagar ago | 0

Answered
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 ...

4 dagar ago | 0

Answered
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 =...

5 dagar ago | 0

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Answered
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...

5 dagar ago | 0

Answered
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...

5 dagar ago | 0

Answered
Solving nonlinear second order diferential equation
%% Dados iniciais clear Massa_foguete_seco = 3000; % Kg Massa_combustivel_inicial = 3000; % kg Empuxo ...

8 dagar ago | 0

Answered
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_...

8 dagar ago | 0

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Answered
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...

8 dagar ago | 0

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Answered
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_...

8 dagar ago | 0

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

ungefär en månad 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 = ...

ungefär en månad 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)] ...

ungefär en månad 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)

ungefär en månad 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;...

ungefär 2 månader 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 ...

ungefär 2 månader ago | 0

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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...

ungefär 2 månader ago | 0

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

ungefär 2 månader 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 .*...

ungefär 2 månader ago | 0

| accepted

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