Stephan
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1 395 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
Accept 5 answers given by other contributors
Awarded to Stephan on 11 Oct 2018
Obtain 50 solvers for a problem you have created
Awarded to Stephan on 11 Dec 2020
Solve all the problems in Introduction to MATLAB problem group
Awarded to Stephan on 28 Jan 2019
Be the first to solve a problem
Awarded to Stephan on 24 Apr 2018
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
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
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
ODE 45 step size changes the turning point
This is not a problem of Matlab, but to the misunderstanding how ode solvers in Matlab work. Read here: https://de.mathworks.co...
environ 8 heures ago | 0
Check for missing argument or incorrect argument data type in call to function 'log'.
Für mich funktioniert es, wenn ich numerische Werte für die Variablen definiere: TP = 500; RP = 200; PP = 201; EPS = 100; A...
environ 8 heures ago | 0
How do i plot this equation in the time domain
see what this does: t = 0:0.01:2*pi; also read about function handles in Matlab: fun = @(t) 5 * (1 + K * m) .* cos(2*pi.*t) ...
environ 8 heures ago | 0
How do I use trading toolbox to get IB option chain?
Using the help of @Scott Tuttle i wrote a function to download the option chain. It can be downloaded at FEX.
environ 9 heures ago | 0
Submitted
Download Option Chain from Interactive Brokers TWS
Download the option chain from an active TWS session for a specified symbol and date or month and save the results in a table.
environ 9 heures ago | 0 downloads |
runge-Kutta problem command ode45
tspan = [0 5]; y0 = 100; Q = 30; b = 0.2; [t,y] = ode45(@(t,y)Q-b*t*y, tspan, y0); plot (t,y,'-o')
6 jours ago | 0
Hello dear, can anybody helping me, how can I calculate this matrix in Matlab, i want to find this Unknown value, Ma and Va?
A = [1 5; 0 1] b = [46; 16] sol = A\b
10 jours ago | 0
Matrix subtraction every two adjacent column
% sample data A = randi(10,5,3) % second col minus first and so on B = A(:,2:end) - A(:,1:end-1) % first col minus secon...
24 jours ago | 0
Extracting subplots from a matrix
use a loop: % randomized data to illustrate: M = randn(16,80); for k = 1:size(M,1) subplot(4,4,k) plot(M(k,:)) e...
environ un mois ago | 1
| accepted
How to solve Multiple DOF Mass Spring Damper system and find/plot acceleration, velocity & displacement vs time
tspan=[0 10]; % Simulation time z0=[0;0]; % Initial conditions for forced vibration [t,z]=ode45(@forced_vibration,tspa...
environ un mois ago | 0
how to change 3d array to 2 d array
a = ['A'; 'B'; 'C'; 'A'; 'B'; 'C']; b = [1; 1; 1; 2; 2; 2]; c = ['N'; 'J'; 'N'; 'J'; 'N'; 'J']; T = table(a,b,c) T_new = uns...
environ un mois ago | 1
| accepted
Can someone explain why I am getting the error "Not enough input arguments (line 2)"?
x0=[1;1]; [x,f]=fmincon(@fun,x0,[],[],[],[],[],[],@mycon) z=peaks; surf(z); function f = fun( x ) f = 4./x(1)+9./x(2)+(...
environ un mois ago | 0
Using fzero for intesection and "integral" for area calculation
clear, clc, clear plot format short g=@(x)exp((-x.^2)./2); h=@(x) x.^2-4.*x; f=@(x) g(x) - h(x); x=linspace(-1,5,100); p...
environ un mois ago | 0
| accepted
solving non linear equations
Your code works properly for me. To access the the results - for example for the solution if N in the third iteration use: >> s...
environ 2 mois ago | 0
how to conver .csv data class from table to double
If it is only numeric data and a and b are of the same dimensions this should work: c = a{:,:} + b{:,:} for example: a1 = ran...
environ 2 mois ago | 0
| accepted
How to convert time stamp 11:21:17.155 into seconds in MATLAB??
format longG a = '11:21:17.155'; b = seconds(duration(a,'InputFormat','hh:mm:ss.SSS')) results in: b = 4...
environ 2 mois ago | 1
| accepted
numeric integral, symbolic function, whats wrong here?
clc clear syms t; rho = exp(sin(t)); theta = 2*exp(sin(t)); phi = 3*exp(sin(t)); rho_dot = diff(rho); theta_dot ...
environ 2 mois ago | 0
| accepted
Supplied objective function must return a scalar value. ERROR in fmincon
J is a 1x6 vector, but should be a scalar. You have to find out why and fix this.
environ 2 mois ago | 0
Bvp with unknown parameter
Try this using a good initial guess: <https://de.mathworks.com/help/matlab/math/solve-bvp-with-unknown-parameter.html>
environ 2 mois ago | 1
Matrix symbolic calculation doesn't simplify expressions
try simplify - here is an example with your expression: syms w E = eye(3) * - (2^(1/2)*((2^(1/2)*w*1i)/2 - 2^(1/2)/8))/2 + (2^...
2 mois ago | 1
| accepted
char to vector conversion. using matrix of chars (16x128)
str2double or str2num should work for this.
3 mois ago | 0
Keep getting 'ans' output in Matlab function
Call it this way: [outResult, logoutResult] = file1(scalar, genvec)
3 mois ago | 0
| accepted
matrix manupulation and reading diagonally
This function may help: M = [13,10,5,2;7,14,11,6;3,8,15,12;1,4,9,16] MyResult = readDiag(M) function R = readDiag(M) R = c...
3 mois ago | 0
| accepted
How to cite only part of a vector in an equation?
One possible way: You could use findgroups in combination with splitapply. For example, a JaneDoe group would be a member of th...
3 mois ago | 0
how to train image?
A good starting point maybe here: https://de.mathworks.com/help/deeplearning/getting-started-with-deep-learning-toolbox.html?s_...
3 mois ago | 0
| accepted
How can i use toeplitz in cell arrays?
G = cell(1,2); G{1} = ones(2); G{2} = 2*ones(2); c = [G{1} G{2}]; r = [G{1} zeros(2)]; result = toeplitz(c,r) results ...
3 mois ago | 0
Solving equation for a value of x
You can use polyder, that calculates the derivative of a polynomial and then you can calculate the result at x=20 using polyval....
3 mois ago | 0
| accepted
Index in position 1 is invalid PID Controller
When you run this the first time you first call the inbuilt function tf and then later you create a variable, which is named tf ...
3 mois ago | 0
min- imum number of coins required to pay
You have some issues in your if-else structure, but also you have a numerical problem - use uint datatype to avoid this: [NumCo...
3 mois ago | 1
| accepted
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