Torsten - MATLAB Central
photo

Torsten


Last seen: Today |  Active since 2013

Followers: 20   Following: 0

Statistics

MATLAB AnswersFrom 03/13 to 03/25Use left and right arrows to move selectionFrom 03/13Use left and right arrows to move left selectionTo 03/25Use left and right arrows to move right selectionUse TAB to select grip buttons or left and right arrows to change selection100%

RANK
14
of 297,307

REPUTATION
16,678

CONTRIBUTIONS
0 Questions
6,742 Answers

ANSWER ACCEPTANCE
0.00%

VOTES RECEIVED
1,941

  • Most Accepted 2024
  • Most Accepted 2023
  • Most Accepted 2022
  • Explorer
  • Master
  • 36 Month Streak
  • Revival Level 2
  • Knowledgeable Level 5
  • First Answer

View badges

Feeds

View by

Answered
I need to create a cicle in which, for a specific value, it solves one set of equation or another. It doesn't compute.
Works for me. Maybe you use an older MATLAB release ? Lcz = 10; %Contact lenght [mm] delta0 = 25; %Softening Lenght [mm] delt...

19 hours ago | 0

Answered
Variable might be set by a nonscalar operator
%% Define varaibles theta_deg=10:1:80; %% theta in 1 degrees increments theta_incline=18.05; theta_decline= 40.65; M=1; % ma...

2 days ago | 1

Answered
Can I specify different thermal conductivities for different regions in a space using Matlap PDE Toolbox? For example, the space is divided into a thermal conductivity space o
There are two ways: A good method is to generate the geometry such that it consists of a certain number of zones to which you c...

4 days ago | 0

| accepted

Answered
Finding x and y values of minimum z in 2-variable function.
z = @(x,y)(x.^2).*(y.^3)-1.4*(x.^2).*(y.^2)-3.91*(x.^2).*y+5.78*(x.^2)-... 11*x.*(y.^3)+15.4*x.*(y.^2)+43.01*x.*y-63....

4 days ago | 0

Answered
Find best fit curve from multiple curves of different size
I parametrized the curves by normalized arc length. To compute the average curve, I took the mean of R- and Z-coordinates of the...

5 days ago | 0

| accepted

Answered
How can I get splines subject to constraints?
This code looks helpful for your purpose: https://uk.mathworks.com/matlabcentral/fileexchange/7976-random-number-from-empirical...

5 days ago | 0

| accepted

Answered
How do I edit a loop to be able to store the variables and outputs used in each loop in a way which can be graphed?
Be careful here. In correlations for friction factors, log is usually meant as log to the basis of 10, not the natural logarithm...

7 days ago | 0

| accepted

Answered
Question solve(eqn)
Replace solve (f1, f2, f3, f4, f5, f6) by [a0,a1,a2,a3,a4,a5] = solve (f1, f2, f3, f4, f5, f6) But note that extrapolating t...

7 days ago | 0

Answered
find is not working in a loop, it skips numbers
Never test two double precision numbers for equality. Because of floating point arithmetic, they will almost always be classifie...

7 days ago | 0

| accepted

Answered
Can someone rectify this code?
My guess is that you work with an older MATLAB version where script and function parts cannot be mixed. Thus save function F =...

8 days ago | 0

Answered
elseif that goes through previous statements but with different parameters
if e(t)==1 nn1 = nn11; nn2 = nn21; elseif e(t)==2 nn1 = nn12; nn2 = nn22; elseif e(t)==3 nn1 = nn13; nn2 = nn23...

9 days ago | 0

Answered
syms to another .m file
Call the other .m-file with the syms-equation (or function) as input argument. syms x f = x.^2; result = fun(f) function res...

9 days ago | 0

Answered
Clarification regarding Sensitivity Analysis of a coupled ODE system using the odesensitivity function
Start with the simple example y'(t) = p(1)*y(t), y(0) = 1. The solution is y(t) = exp(p(1)*t). The (local) sensitivity is ...

9 days ago | 1

| accepted

Answered
How to make ode45 store/return only results of every n-th time step to reduce memory use?
You can specify the times when the solution should be saved in the input variable "tspan" to "ode45". And you should test wheth...

10 days ago | 1

| accepted

Answered
Energy Harvesting of Cantilever Beam with MSMA alloy1
I inserted "warning('off')" at the start of your code because your matrix M in your function "system_eqs" is singular and MATLAB...

12 days ago | 0

| accepted

Answered
Sampling from inverse gamma distribution by specifing mean and standard deviation
It works for mu = 0.5, sig = 0.5, e.g. . It seems that your distribution parameter "a" is too close to the critical value of a =...

14 days ago | 0

| accepted

Answered
How to code an equation with that integrates a vector.
If there is no closed-form expression for u (e.g. if u depends on x), you can solve the vector-differential equation dx/dt = u ...

14 days ago | 0

Answered
The surface area won't round to one decimal place and I don't know how to get rid of the 'e's.
https://uk.mathworks.com/help/matlab/ref/fprintf.html https://uk.mathworks.com/help/matlab/ref/format.html

14 days ago | 1

Answered
Need to correct the following script in part of Infinitely Long Horizontal Cylinder (to be of perfect circular base)
%% 2. Infinitely Long Horizontal Cylinder subplot(1,3,2); theta = linspace(0, 2*pi, 30); x_v = linspace(-10, 0, 20); [Theta,...

22 days ago | 0

| accepted

Answered
Grey box model of 1d heat diffusion in a rod (official mathworks example)
I think it will be simpler to couple "pdepe" for the solution of your PDE and "lsqnonlin" for optimizing your model parameters. ...

22 days ago | 0

| accepted

Answered
trouble using pdepe to solve system of pdes
Your initial condition for u(2) at x = 0 is not consistent with your boundary condition. Use function u0 = icfun(x) global ...

22 days ago | 0

| accepted

Answered
How plot 2d of more than 3 function and substitute the number in each function separate parameter?
y=@(x,t,m)real(((-0.385e1 .* tanh(-x - 0.310e1) - 0.385e1 * coth(-x - 0.310e1)) .^ (0.1e1 ./ m ./ 0.2e1)) .* exp(i * (0.431e1 * ...

24 days ago | 1

| accepted

Answered
Help with the Deflection of a Plate in MATLAB
You are trying to solve the heat conduction equation with a homogeneous heat sink -q/D and boundary temperature 0. Is this the s...

25 days ago | 0

| accepted

Answered
Time dependent variable in plot.
The simplest method is to define x, compute y in a loop and plot: x = 0:0.1:15; for i = 1:numel(x) if x(i) >= 0 & x(i) < ...

26 days ago | 1

| accepted

Answered
Solving Advection Equation PDE with 2nd order Accuracy
Usual second-order schemes for the advection equation will always produce oscillations. Section 3.1.3 of the enclosed article su...

26 days ago | 0

| accepted

Answered
How can I use fmincon with general (user defined) nonlinear constraints?
g = @(x)deal([gl(x(1:nx),x(nx+1:nx+ny));gf(x(1:nx),x(nx+1:nx+ny))],[])

27 days ago | 0

| accepted

Answered
Assign fitlme output to a variable
See https://uk.mathworks.com/help/stats/linearmixedmodel.html The functions that can be applied to a fitlme object are: a...

27 days ago | 0

| accepted

Answered
Avoiding -0.0000 as an output
The results for d2,...,d4 aren't exactly 0 because of floating point errors in their computation. So without artificially manipu...

28 days ago | 0

| accepted

Answered
solve symbolic eigenvalue problem
If you want an analytical expression for the eigenvalues dependent on the parameter a, your matrix A must have dimension <= 4. ...

28 days ago | 0

Answered
problem to solve incorrrect
%% R-RRR clear all; clc; close all % Input data AB=0.325; %(m) BC=0.938; %(m) CD=0.675; %(m) CE=0.6; %(m) xD=0.8; %(m) y...

1 month ago | 0

Load more

Go to top of page