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Stephan


930 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
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...

4 días 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...

4 días ago | 1

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)>=...

5 días ago | 0

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

5 días 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)

5 días 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)

5 días ago | 0

| accepted

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...

6 días ago | 0

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

6 días 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...

6 días 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...

6 días ago | 0

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Answered
Solving a system of second order differential equations (coupled mass-spring system)
syms X1(t) X2(t) K f m1 m2 Y t EqX1 = diff(X1,2) == K*(X1-X2)/m1; EqX2 = diff(X2,2) == f + K*(X2-X1)/m2; [ODE,Vars] = odeTo...

10 días ago | 0

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Answered
Why INTLINPROG returns non-integer?
load intlinprogfail.mat % file attached intcon = 1:45; [x, ~, flag] = intlinprog(fdummy, intcon, [], [], Aeq, beq, lb, ub); r...

10 días ago | 1

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Answered
How to sort one column of a matrix
B = sortrows(A,-3)

13 días ago | 0

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Answered
comparing the two arrays
x1=[1,2,3,2,0,3,4,3,5,4,5,6,8]; x2=[3,0]; res = zeros(1,numel(x2)); for k = 1:numel(x2) res(k) = sum(ismember(x1,x2(k)...

14 días ago | 0

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Answered
matlab code for lagrange method?
Hint: Answers has a search function. We will not write your code - learn from examples: <https://de.mathworks.com/matlabce...

15 días ago | 0

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Answered
Selecting data in an array based on a logical value array?
<https://de.mathworks.com/help/matlab/math/array-indexing.html#MatrixIndexingExample-3>

15 días ago | 1

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Answered
Optimization of equation with 3 variables
<https://de.mathworks.com/help/optim/ug/fmincon.html>

17 días ago | 1

Answered
check if random numbers( 5x5) generated are greater than (1x5)
Here is an example using <https://de.mathworks.com/help/matlab/ref/gt.html gt (greather than)> and <https://de.mathworks.com/hel...

24 días ago | 0

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Answered
how do i get Matlab compiler for home users?
At the Moment there is no way to get this with a home license. You can only hope that TMW will someday change his policy - or yo...

25 días ago | 0

Answered
how with ode45 order we can solve a switching problem?
<https://de.mathworks.com/help/matlab/math/ode-event-location.html>

28 días ago | 0

Answered
My gamultobj nonlinear constraints are being ignored
Get rid of the <= operators, they make the result of myCon a logical zero vector, which brings trouble. Use this instead, to cal...

28 días ago | 2

Answered
Working with table.
Your_Table_new = Your_Table(Your_Table.Recommeded_Working_Hours >= 3000,:);

29 días ago | 0

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Answered
Function "solve" returns a struct
syms a1 a2 q1 q2 eq = a1*cos(q1) + a2*cos(q1)*cos(q2) - a2*sin(q1)*sin(q2) == 0 sol = isolate(eq,cos(q1)) pretty(sol)

29 días ago | 0

Answered
MATLAB codeto python code conversion
There is no tool to do this in an automatic manner. To do this you can seither do (let) this by hand or you use the free Matlab ...

alrededor de 1 mes ago | 1

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Answered
Showing years on x axis graph
<https://de.mathworks.com/help/matlab/ref/xticks.html>

alrededor de 1 mes ago | 0

Answered
Read images from different subfolders and create movie from them?!
I suggest to read about the <https://de.mathworks.com/help/matlab/ref/matlab.io.datastore.imagedatastore.html imageDatastore> fu...

alrededor de 1 mes ago | 0

Answered
Creating a sequence with repeating numbers
b = repelem(1:430,1,2) or for a column: b = (repelem(1:430,1,2))'

alrededor de 1 mes ago | 1

Answered
How to read whole image dataset, and how to resize all images at once?
I suggest to read about <https://de.mathworks.com/help/matlab/ref/matlab.io.datastore.imagedatastore.html ImageDataStore> and re...

alrededor de 1 mes ago | 0

Answered
4 non-linear differential equations with ODE45
working scripts: %% V�rdier % parametre: % Carrying capacity k1 = 500; k2 = 600; k3 = 700; % De incubated males and ...

alrededor de 1 mes ago | 0

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