Community Profile

photo

Stephan


Last seen: Today
1,424 2017 年以降の合計貢献数

Knowledge means knowing where it is written...

Interested in:
- Optimization
- Mathematical Modelling
- Improvement of my programming skills

連絡する

Stephan's バッジ

  • 36 Month Streak
  • Guiding Light
  • Thankful Level 2
  • Quiz Master
  • Introduction to MATLAB Master
  • Speed Demon
  • Personal Best Downloads Level 1
  • First Review
  • First Submission
  • Knowledgeable Level 4
  • Revival Level 3
  • Creator
  • First Answer
  • Commenter
  • Promoter

すべて表示

貢献した分野
表示方法

回答済み
Storing datetime double in a table
%%%Set this to desired sheet sheet = 'Test'; %Sets Date time format for when table is read opts = detectImportOptions("Weat...

約13時間 前 | 1

回答済み
step respone, impulse response
s=tf('s'); kb=52; k1=156; k2=53; G1=10/(s+0.01); G2=G1/(1+kb*G1); G3=G2*k2*k1; G4=G3/(G3+1); subplot(2,1,1) impulse(G...

約16時間 前 | 0

回答済み
How can I do such a "countifs"(excel) process in Matlab?
You do it by logical indexing: A = randi(10,1,15) CountIf = numel(A(A>5)) gives: A = 9 7 4 10 1 5...

約17時間 前 | 0

回答済み
Dijkstra's Algorithm
You could make life easier using Matlab inbuilt graphs functions. One example is <https://de.mathworks.com/help/matlab/ref/graph...

1日 前 | 0

回答済み
How to find the sum of duration if the consecutive row elements are the same?
Save the durations you calculated using *|diff|* in an additional column so that the durations are correct for every row in your...

1日 前 | 0

回答済み
How can i sum up 56-year daily precipitation data from APHRODITE (netcdf file) into monthly?
If you organize your data in a timetable you can use retime to sum up monthly.

1日 前 | 0

回答済み
Generate new column from cumulating another
A = (1:4)' A(:,2) = cumsum(A) gives: A = 1 2 3 4 A = 1 1 2 3 3 ...

1日 前 | 1

| 採用済み

回答済み
mathematical expression from string input
https://de.mathworks.com/help/symbolic/str2sym.html >> fun = str2sym("(sin(sqrt(x)+a) * e^sqrt(x)) / sqrt(x)") fun = (e^...

1日 前 | 1

回答済み
Solve formal equation and get the solution with these variables
syms i1 i2 ib v1 v2 hie hre hfe hoe hfb eqns(1) = i1==-ib-hfe*ib+(v1-v2)*hoe; eqns(2) = i2==hfe*ib+(v2-v1)*hoe %ib==-v1/hie...

1日 前 | 0

| 採用済み

回答済み
Importing a table with unknown number of rows
I dont think it is needed to specify this, using readtable function. I never used this option to import a .csv-file as table in ...

2日 前 | 0

| 採用済み

回答済み
Problem with solution seemingly simple linear system of equations [0x1 sym]
rewriting the system to matrix shows that this system has no solution, due to inconsistence: d=32; %mm - Srednica tłoka p1=0.5...

3日 前 | 0

| 採用済み

回答済み
Integration using trapz method
1 missing bracket and you missed to define dx: d = 30; E0=8.85e-12; c=.1; dx = 0.1; a = 0; b = 1; x = a:dx:b; N = lengt...

3日 前 | 0

| 採用済み

回答済み
Meshgrid fo variables in complex equation
You might want to try fimplicit3: syms f(x,y,z) f(x, y, z)=2*x+3*y+4*z==0 fimplicit3(f) or an even more complex example: f(...

3日 前 | 1

| 採用済み

回答済み
Define vector v in the code
v=[2,-3,-5,6] result = prod(v(v>0))

4日 前 | 0

| 採用済み

回答済み
How to split an cell array of two numbers into two columns
YouWant = [m5{:}]'

4日 前 | 0

| 採用済み

回答済み
How to calculate matrix M*T=T
syms T2 T3 M = [1., 0, 0, 0;... 0.5, 0, 0.5, 0;... 0, 0.5, 0, 0.5;... 0 0 0 1.] T = [500; T2; T3; 300] B =...

4日 前 | 0

| 採用済み

回答済み
how would i change an undirected network into a directed network on matlab?
here is a small example: A = [0 0 1; 0 0 1; 1 1 0] ug = graph(A) B = zeros(size(A,1)) B = B + triu(A) dg = digraph(B) ...

12日 前 | 1

回答済み
Simplify a symbolic expression
syms s T=21.0325 L=3.5890 X=(0.6*T)*((s+(1/L))^2)/s vpa(expand(X),10)

12日 前 | 0

| 採用済み

回答済み
which optimization method should I use?
Following your statements surrogateopt appears to be the correct choice.

28日 前 | 0

| 採用済み

回答済み
Invalid array indexing. column 19.help
epsilon(i)(xi2(i)((1-epsilon(i)) is not allowed in Matlab, do you mean?: epsilon(i)*(xi2(i)*((1-epsilon(i))

28日 前 | 1

| 採用済み

回答済み
Matlab Code (Reinforcement Learning in Finance by Alex Roumi, MathWorks)
The code has never been published. Usually the code used in webinars is published at file exchange, but this was a presentation ...

28日 前 | 0

| 採用済み

回答済み
Error using horzcat:: Dimensions of array being concentenated are not consistent
There are 2 times the same values at different indices. To get only the first occourence: S=[.2046e17 .1381e17 .9249e17;.1679e1...

28日 前 | 0

回答済み
How do i create a "Cut" at origin?
A = 5; M = 0.8; w = 1.2; fi = 30; t2 = 20; firad = fi*pi/180; t = linspace(0,t2,1000); y = M + A*sin(w.*t + firad); ...

28日 前 | 0

| 採用済み

回答済み
Creating matrix with diag command
This is how a normal Matlab user would so this z = diag(1:10) z = 1 0 0 0 0 0 0 0 0 ...

28日 前 | 0

| 採用済み

回答済み
not enough input data
Note that i used the same function for step2 like step1 to make it work - replace step2 with the correct function. Also i assume...

28日 前 | 0

| 採用済み

回答済み
function 'step'.
step(ss(A,B,C,D))

28日 前 | 0

回答済み
Getting lowest postive number in array with it's index
S=[-6.3e7 -0.0001e7 inf;5.2545 -.2996e7 inf] m_idx = [min(S(S>0)), find(S==min(S(S>0)))]

29日 前 | 0

| 採用済み

回答済み
Changing values in atable
% Example table with random data T = splitvars(table(randi(10,10,5))) T = 10×5 table Var1_1 Var1_2 Var1_3 ...

29日 前 | 0

回答済み
Is it possible to change the number of hidden layer in nprtool?
It is - indirectly - use patternet and then use a vector as input: net = patternnet(10); view(net) or if you need more hidden...

29日 前 | 0

回答済み
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...

約1ヶ月 前 | 0

| 採用済み

Load more