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Stephan


949 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
Getting started with machine learning
Matlab has an excellent documentation site including several examples for every Toolbox. Additionally there are a lot of webinar...

ungefär 5 timmar ago | 0

Answered
Use "solution converged to an infeasible point" as an input
Use the output exitflag to find out if there was no feasible point: [x,fval,exitflag,output] = fmincon(@(X) obj_function(X,P,Pd...

ungefär 5 timmar ago | 1

| accepted

Answered
bvp4c gives error "The derivative function ODEFUN should return a column vector of length 4."
Your equations for dcccdt(2) and dcccdt(3) return vectors of size 4001x1, due to the length of p. This is the problem - there ha...

ungefär 5 timmar ago | 0

Answered
Jacobian Matix vector of variables?
You have to distinguish between a symbolic variable syms x and a symbolic function syms y(t) This is why this works: syms r...

ungefär 11 timmar ago | 0

Answered
Equation with one unknown
With Symbolic Toolbox: syms t positive g=9.807; %m/s2 d= 1.225; %kg/m3 A=1.9; m=84; Cd=1.14; fun = 2*m/(A*Cd*d)* l...

ungefär 12 timmar ago | 0

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Answered
How can i graph the function from 0 to a certain interval?
doc xlim doc ylim

ungefär 19 timmar ago | 0

Answered
ODE non homogeneous ploting graph
y = @(x) -5.*exp(2.*x) + 3.*exp(x) + 3.*cos(x) + sin(x); fplot(y,[-20 1],'b-',"LineWidth",2)

en dag ago | 0

Answered
ODE45 - Modeling GHR Microspic Car following Model
This code runs, but still has a problem: load mytrafficdata5; basic_ghr(Distance_n,Time_t,Velocity_n) function basic_ghr(Di...

3 dagar ago | 0

Answered
how to write the mean equation
A_mean = sum(A,'all')/numel(A)

3 dagar ago | 0

Answered
Accessing the Confusion Matrix Data
doc confusionmat confusionmat gives you a matrix, containing all the informations needed - it can be used also as the Normalize...

3 dagar ago | 0

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Answered
Continuous and repetitive gaussian random function in matlab
If i understood you correctly, you want to get the same random values every time you run your code. This is reached by the rng f...

4 dagar ago | 0

Answered
random (normal, gaussian series data
If you have Statistics and Machine Learning Toolbox: https://de.mathworks.com/help/stats/makedist.html?s_tid=doc_ta#btstdan-2 ...

4 dagar ago | 0

Answered
Help with file format conversion please!
% Setup the Import Options and import the data opts = delimitedTextImportOptions("NumVariables", 2); % Specify range and del...

4 dagar ago | 0

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Answered
how do I substitute all negative values in a vector with a random number between 0 and 2
y(y<0) = 2*rand(1,numel(y(y<0)))

4 dagar ago | 0

Answered
Setting an equation equal to another variable (rearranging) in 2012b
syms s t eq = s == 3*5^(1/2)*t sol_t = solve(eq,t) Beginning from 2017a you can use *isolate*.

5 dagar ago | 1

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Answered
Hello. Is SimPowerSystem available in Matlab 2019a?
The toolbox was changed and the functions are now available in Simscape Electrical.

10 dagar ago | 0

Answered
Hi! How I can download matlab R2010a?
<https://www.mathworks.com/downloads/web_downloads/select_release?mode=gwylf>

11 dagar ago | 0

Answered
Saving a graph with edges and nodes
You can not save a workspace object in a *.m-file*. Use a *.mat-file* instead to save your graph. You can load this in other scr...

14 dagar ago | 0

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Answered
Where can I study more about scripts in Mat Lab.
you might want to look here: <https://de.mathworks.com/learn/tutorials/matlab-onramp.html?s_cid=learn_ONRAMP_BAN>

18 dagar ago | 0

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Answered
Fit y=m*x into a non lineardata
This forces b to be equal to zero - the value you are interested in is m(1): % Your data x = 0:10; y = [1.5 3 5 7 8 9 13 16 2...

30 dagar ago | 1

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Answered
automate the transfer of text files iteraton wise
name = "file_1.txt"; filelist = string(zeros(730,1)); diffusion = cell(730,1); for k = 1:730 number = string(k); f...

30 dagar ago | 1

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Answered
filter string in the string
str = 'this matlab is a good software, it is a version 9.4 which is equal to 2018a' str = char(str); idx = find((uint8(str)>=...

ungefär en månad ago | 1

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Answered
Reading Data from txt file with a unique FormatSpec
One way: A = reshape(double(replace(string(readcell('Test.txt')),["[[", "[", "]", "]]"],["", "", "", ""])),[],12) This uses th...

ungefär en månad ago | 0

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Answered
Solving a ODE in matlab
ode = @(t,y) y.^2-y.*0.1*cos(2.*t)-0.2*cos(2.*t); t=[0 8]; y0 = -1; [t,y] = ode45(ode,t,y0); plot(t,y)

ungefär en månad ago | 2

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Answered
n x 1 array, add row-wise
https://de.mathworks.com/help/matlab/ref/cumsum.html A = [1 3 4 5 3 8 3]' B = cumsum(A)

ungefär en månad ago | 0

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Answered
help to convert text file symbol into array
Assuming you import this as a string, you could use: a = "4c07b] IF hit state: 5 (S) valid:" b = char(a) c = b(:) which give...

ungefär en månad ago | 0

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Answered
Run a code for several values
Sounds like you might be interested in vectorization.

ungefär en månad ago | 0

Answered
write a function that takes any equation as an input
You might to want to achieve this: % Inputs xvals = 0:0.01:10; fun = @(x) x.^5 + sin(x); % call function res = splinecalc...

ungefär en månad ago | 1

Answered
How to extract specific images from a library of images?
You can construct a string array of the desired file names like follows: exceldata = [0,3,8,12,16,224]; filenames = string(100...

ungefär en månad ago | 0

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