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Stephan


1.025 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
How to use GlobalSearch to find global minimum
Try the following: ver Its output should look somehow like this: >> ver ----------------------------------------------------...

alrededor de 3 horas ago | 0

Answered
do anyone know how to put all iteration of a for loop into a matrix?
clear all clc a=0; b=8; n=2; run=input('Input your number of iteration:'); i=(1:run); integral_matrix = zeros(numel(i),1);...

alrededor de 3 horas ago | 1

| accepted

Answered
Optimization with MATLAB solver's
Since we do not know what kind of problem you try to solve, all we can give is a general advice. If you follow the links you sho...

alrededor de 4 horas ago | 0

Answered
Solving 2 ODE's with ode45
tfinal = 100; tspan = [0 tfinal]; winitial = [1 300]; [t,y] = ode45(@sub1,tspan,winitial) plot(t,y,'LineWidth',2) %%%...

alrededor de 12 horas ago | 0

Answered
Explicit root of symbolic equations
syms d1 d2 d3 d4 d5 d6 h11 h12 h13 h14 h21 h22 h23 h24 h41 h42... h45 h46 h51 h52 h55 h56 h61 h62 h65 h66 eq1 = h11*d1+h12...

1 día ago | 0

Answered
could anyone help me how to remove the zeros that comes after the number present after the decimal
Use format shortG: A = 12.3400 2.3400 >> format shortG >> A A = 12.34 2.34

1 día ago | 1

Answered
Sum of near infinite series?
Think about your row. You can rewrite it - always two elements are the same as n^2/(n^2-1). With this knowledge read about <h...

1 día ago | 0

Answered
Max and Min of matlab function
f = @(r) (150.*(((1 + r).^36)-1) - 4500.*(r.*(1 + r).^36)); t = fplot(f,[0.0001 0.02]); high = max(t.YData) low = min(t.YDa...

2 días ago | 0

| accepted

Answered
Babylonian algorithm - square root of a number
What is the problem - works for me: y = sqrtB([16 4 9]); function y=sqrtB(x) % It returns a row vector containing the...

2 días ago | 1

| accepted

Answered
how do I create Matraix with same elements for several rows
turbines = [25,35,45,55,65]; how_often = 10; No_of_turbines = repmat(turbines,how_often,1) to get it ten times: No_of_turbin...

2 días ago | 0

| accepted

Answered
Save lines from a text file
It is a bad idea to store the lines all in different variables - this point has been discussed here for many times... Use a tabl...

2 días ago | 1

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Answered
Failure in initial objective function evaluation. LSQNONLIN cannot continue.
The problem is that your DATA file is not complete - the sheet that should contain the data for N ist empty - therefore N is als...

2 días ago | 0

| accepted

Answered
Delay differential equation of glucose insulin model
You should work through this example: https://de.mathworks.com/help/matlab/math/dde-with-constant-delays.html

2 días ago | 0

Answered
how can i give output of a python file as input to a matlab matrix
Look here: https://de.mathworks.com/matlabcentral/answers/486354-read-a-matrix-from-a-text-file#answer_397428

2 días ago | 0

Answered
reading large text files into matrix
As already stated in the other question you asked with the same content, a possible way is: A = readcell('output1.txt'); B = s...

2 días ago | 0

Answered
read a matrix from a text file
A = readcell('output1.txt'); B = str2num(char(replace(split(string([A{:,1}]),']'),... {'00', '10', '01', '11', '['},{'0 0'...

2 días ago | 0

Answered
Unable to perform assignment because the size of the left side is 1-by-1 and the size of the right side is 3-by-3.
You could check: https://de.mathworks.com/matlabcentral/fileexchange/69896-linalgsubstitute I used this function to build the ...

2 días ago | 0

Answered
Issuing a call to a function
This should help you, solving the problems: https://de.mathworks.com/help/matlab/matlab_prog/create-functions-in-files.html

2 días ago | 0

Answered
I face an error when apply bvp4c: Unable to solve the collocation equations -- a singular Jacobian encountered.
It appears to work by making 2 small changes in the code: init=bvpinit(linspace(0.001,0.9999,10),[0 0]); sol=bvp5c(@bvp_Q,@bvp...

2 días ago | 1

Answered
How to filter a data
You can do this if there is a pattern: X = [0.081,0.082,0.089,0.091,0.095,0.098,0.13,0.15,0.18,0.21,0.25,0.31]; x = [X(1:3:end...

2 días ago | 0

Answered
How can I sort a matrix elementwise ?
B = sort(reshape(A,[],1))

3 días ago | 1

Answered
Error: Error using load Unknown text on line number 1 of ASCII file cats.csv "Sex".
try <https://de.mathworks.com/help/matlab/ref/readtable.html |*readtable*|> instead.

3 días ago | 0

| accepted

Answered
Locate any decimal value inside a matrix?
Why use an ineffficient loop instead of vectorized inbuilt functions? Try: x=[1 2.5 4;5 3 3.2;4 9 2] idx = find(mod(x,1)~=...

3 días ago | 0

Answered
Convert matrix A to S
S=[A(2,1:2); A(1,1:2); 9 10]

3 días ago | 0

Answered
Extract column from matrix
Do this A2 = A(:,3) but note that you did not code the matrix as you wrote: >> A = [6 2 3; 9 3 5; 4 4 7] A = 6 ...

3 días ago | 0

Answered
what is the problem in this function ?
Use: result = fmin4(a,b,c) instead of pressing the RUN button

3 días ago | 0

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Answered
problem in dealing Cell and array
% produce some data to play with r = 3; q = 4; k(1:5) = {rand(r,q)}; % size of k = 1 x 5 % This should do what you expect:...

3 días ago | 1

| accepted

Answered
I need help with this false position script
No idea what your problem is, code runs for me: format long fx=@(x)-12-(21*x)+(18*x^2)-(2.75*x^3) a =sprintf('%.8f', fp(f...

4 días ago | 0

Answered
Run a script multiple times and save outputs
Write a function or a second script which calls your script in a for loop and save the results in a new line of a result matrix ...

4 días ago | 0

| accepted

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