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Stephan Jung


201 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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Answered
Referencing Arbitrary Functions from other Script Files to Solve System of Equations
Hi, This looks like your script bfield is missing a function [what ever comes out] = bfield (whatever goes in...

11 hours ago | 0

Answered
How to solve a equation that appears z2
Hi, to get numeric solution use: vpasolve(eqn,Sig) after assigning values to the other variables. Best regards ...

1 day ago | 0

Answered
accessing data from a struct
Hi, A = R.X assigns the Matrix saved in the field X of the struct R to A. % define empty struct R = struct(...

2 days ago | 0

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Answered
Genetic Algorithm : Lower and Upper Bounds
Hi, the handling of bounds in the case of the use of ga is very well described here: <https://de.mathworks.com/help/gads/c...

2 days ago | 0

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Answered
bar chart with hold on
Hi, x = [9,10,11,12,13,14]; x1 = [1,2,3,4,5,6]; y = [2,4,5,6,7,8]; y1 = [3,2,4,5,6,9]; h = bar([x x1],[y y1]);...

3 days ago | 0

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Answered
Plotting the left and right side of a tricky equation?
Hi, this works also on R2018a: <</matlabcentral/answers/uploaded_files/125793/fplot_test.PNG>> Try the following: ...

4 days ago | 0

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Answered
I am trying to solve these coupled equations using ode45...I have attached both the function file and script file...
Hi, write your function in a way that it returns a column-vector like below. Then fix the error regarding your plot, which ap...

4 days ago | 0

Answered
Solve for y when it cant figure it out in y=f(x) form. Need to solve in matlab function block in simulink
Hi, you can do so: syms x y % Starting Point fun = 0.364*(y-0.024)-sqrt(0.00060025-(0.009+y)^2) == 0.048*(x-0....

5 days ago | 0

Answered
I want to know how this code is working.
Hi, lhe logical array inside the A(...) gives back all the values where the index represented by the logical array is true. T...

6 days ago | 1

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Answered
Solving for level curves of an elliptic paraboloid given by quadric surface equation
Hi, here is an approach - free for play with it and improvement... Just to let you start: % Define a function to play wi...

6 days ago | 1

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Answered
Problem when using "solve" command
Hi, in your code there is a closing parenthesis missing at the end of the equation - use this: syms V R gamma r Qi eq...

6 days ago | 0

Answered
Can linprog run using decimals in the "f" and "Aeq" matrices?
Hi, there is no need to have integers. See <https://de.mathworks.com/help/optim/ug/linprog.html |linprog|> documentation for ...

7 days ago | 0

Answered
Classification Learner App vs. Training and testing a model programmatically, Is there any hidden magical step in the classification learner app?
Hi, A possible way to do this is working with the app and then, when you got a good result, export the code to matlab. This a...

7 days ago | 1

Answered
How to get coefficient values(such as %)of gaussian fit?
Hi, look this: <https://de.mathworks.com/matlabcentral/answers/404352-how-to-access-the-result-of-curve-fit-app-in-the-wor...

7 days ago | 0

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Answered
What are the fitcecoc settings for a tie between classes?
Hi, You can do this through a cost matrix that penalizes unwanted misclassification. See the section in the documentation: ...

7 days ago | 0

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Answered
How to encounter errors like 'Solver stopped prematurely' and 'Failure in initial objective function evaluation. FSOLVE cannot continue.'?
Hi, i can only give you about 1.5 answers of the 2 you asked: *Answer on sub-question 1.* In your function F (x) there ...

8 days ago | 0

Answered
For a contour how to set the values of a matrix to zero for certain values of x-axis.
Hi, does this what you expect? z = rand(20,21); x = linspace(-10,10,20); y = linspace(0,20,21); z(x<0,:) = 0;...

9 days ago | 0

Answered
Transferring MATLAB 2008a to new laptop
Hi, you can go to the license center at mathworks.com and visit the section of your own licenses. When you choose the tab _in...

9 days ago | 0

Answered
How to create function handle from fit struct after using curve fitting toolbox?
Hi, Why do you need this? You can directly compute new values for your fitresult: y_new = fitresult(x_new) This retur...

10 days ago | 0

Answered
Errors in objective function
Hi, in addition to the issues that Torsten noted in his comments, note the following errors: * you have X(i) instead of x(...

10 days ago | 1

Answered
Need to solve the equation to find ABC Values
Hi, x and y do not have the same length - if i assume, that y = -2.2026 belongs to x=-0.5 and so on you can determine the val...

11 days ago | 0

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Answered
Zener Diode model for SimScape
Hi, Simscape Electronics has a zener diode (as subtype of diode) here: <https://de.mathworks.com/help/physmod/elec/ref/dio...

12 days ago | 0

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Answered
Different results in MATLAB and Simulink
Hi, your two systems differ in the second number in the numerator of your transfer function by about a factor of 10: <</ma...

12 days ago | 0

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Answered
How to evaluate symbolic derivative?
Hi, you are treating the derivate like the function handle - but it is not a function handle. What you do is asking matlab...

12 days ago | 0

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Answered
customised capacitor in simulink
Hi, i know that this is possible. I did not do it by myself until now, but this link could help to find a way to do what you ...

14 days ago | 1

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Answered
Por que se congela mi pc al usar syms
hola, El idioma del foro es el inglés, lo que ayuda a obtener más respuestas. Prueba esto aquí: <https://de.mathworks.com/...

14 days ago | 0

Answered
How to split a matrix for different plots?
Hi, for your matrix A: >> A = [ 1 23 240;2 22 100;2 44 900;1 33 800] A = 1 23 240 2 2...

14 days ago | 0

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Answered
Error Using Function Fplot
Hi, this should work - see comment for the issue: T=[-20:20:120] mu=[4 0.38 0.095 0.032 0.015 0.0078 0.0045 0.0032] ...

15 days ago | 1

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Solved


Find the largest value in the 3D matrix
Given a 3D matrix A, find the largest value. Example >> A = 1:9; >> A = reshape(A,[3 1 3]); >> islargest(A) a...

17 days ago

Solved


Check if number exists in vector
Return 1 if number _a_ exists in vector _b_ otherwise return 0. a = 3; b = [1,2,4]; Returns 0. a = 3; b = [1,...

17 days ago

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