photo

Torsten


Last seen: Today Active since 2013

Followers: 7   Following: 0

Statistics

  • 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
use of pdepe for a space-dependent diffusivity
First: Don't name the vector "diff" since "diff" is an internal MATLAB function. Name it D, e.g. Second: To get the correct val...

ungefär 3 timmar ago | 0

| accepted

Answered
If I have an array and I need to find an element in the array how do I go about it?
Compute 100*states(:,1)+10*states(:,2)+states(:,3) and use "find" to compare with C.

ungefär 22 timmar ago | 1

Answered
Solve a differential equation and determine when it gets close to steady state
You can use an event function for the ODE integrator and stop integration when abs(dy/dt) (in your case abs(0.1 * (c-20) * (23-c...

ungefär 23 timmar ago | 0

Answered
the degradation of ozone in aqueous solutions (water). When I plot the all three components, the plot stays at the 0 value for all components.
There seems to be a singularity in the solution at t approximately 320. ProjectOzone() function ProjectOzone clc ki = 7e-3;...

en dag ago | 0

Answered
The code below runs nonstop, and the results are not shown. why is that?
The code below runs nonstop, and the results are not shown. why is that? "solve" won't succeed for your system of equations bec...

3 dagar ago | 0

Answered
Create number of for loops depending on size of N
The N columns of the resulting C-matrix contain i_first, i_second,... imax = 8; N = 4; i_average = (sum(0:N-1)/N+sum(imax:-1:...

3 dagar ago | 0

Answered
How to make Matlab recognize that an expression rewritten by using subexpr() is equal to the original expression?
You have to resubstitute sigma by (a+b+c+d+e)^(1/2) in x_2 to compare with x: syms a b c d e f x x = a + (a+b+c+d+e)^(1/2) + c...

3 dagar ago | 0

Answered
plot the output c(t) using mathlab and show setting time on you graphf
Use "fplot" as done in your code above.

3 dagar ago | 0

Answered
Describe the solution trajectory of differential systems with mixed time-varying delay
To write your equations as a system of delay differential equations that can be handled by a MATLAB solver, set x3 = integral_{...

3 dagar ago | 1

| accepted

Answered
Plot between Nu vs Ra
Replace Ra_values = 10:100:100000; by Ra_values = (10:100:100000).';

3 dagar ago | 0

Answered
Resetting only a section of my state during event driven ode45 simulation
After the event has been triggered, control is returned to the calling program. If you want to continue integration with the e...

4 dagar ago | 1

Answered
Index exceeds the number of array elements. Index must not exceed 1.
path_length_BS_IRS_reflect_UE(i) does not exist for i > 1 because path_length_BS_IRS_reflect_UE is a scalar value, namely 223.60...

4 dagar ago | 0

Answered
Dot indexing is not supported for variables of this type.
Test before your loop % Loop through each entry in the list and extract data for i = 1:numEntries dt(i) = dateti...

4 dagar ago | 0

| accepted

Answered
How do I know what method Matlab is using when plotting ltiview?
I don't know Itiview nor risetime, but isn't there a literature link in the documentation for the function you are using ? If ...

4 dagar ago | 0

Answered
How to solve algebraic equations for different values of variables ?
% Solve the equation eqn = Ac.*I.*eta-m.*c.*(Te-Ti)==0 for i=1:numel(eqn) s = solve(eqn(i),Te); S(i) = vpa(s(s>=0)); en...

5 dagar ago | 0

Answered
function file used with 2 Matrices as input
You are not allowed to use the same name for the function and an output array. Thus rename one of them. And ln_AOU as output pa...

6 dagar ago | 0

| accepted

Answered
Solving a linear programming problem uising linprog
A = -[110 205 160 160 420 260;... 4 32 13 8 4 14;... 2 12 54 285 22 80]; b = -[2000; 55; 800]; Aeq = []; beq = ...

6 dagar ago | 1

| accepted

Answered
BVP Error, help with explaination
The solver is no longer able to capture the steep gradient of your solution at x=0. Look at sol.x in the last step of the cont...

6 dagar ago | 0

Answered
Data type symfun (code problem)
If your MATLAB release throws an error (R2024a does not as you can see above), try [n(x) d(x)] = numden(df(x)) instead of [n ...

7 dagar ago | 1

Answered
The estimation error is strangely obtained from Simpson's 1/3 rule...
syms a b c d e real syms t real f(t) = a*t^5 + b*t^4 + c*t^3 + d*t^2 + e*t; s = 0; i = -1/2; while i < 959.5 i = i + ...

7 dagar ago | 0

| accepted

Answered
V2H Optimization: No feasible solution found
Use energyStorage = optimconstr(T); energyStorage(1) = BSS_SOC(1) == 0; energyStorage(2:T) = BSS_SOC(2:T) == BSS_SOC(1:T-1) -...

8 dagar ago | 1

| accepted

Answered
Need to solve the following equation with three knowns and 2 unknowns.
H_BM = rand(100,1); g_mean = rand(100,1); Wi = rand(100,1); Hi = H_BM; gi = g_mean; x = Hi.*gi; y = Wi + Hi.*gi; fitl...

8 dagar ago | 1

Answered
Why does Matlab not recognize fieldnames function?
You overwrite the "fieldnames" function by setting it to a variable value: fieldnames = fieldnames(results.digitalMap);

9 dagar ago | 0

| accepted

Answered
Simulate Fick's 1st and 2nd laws of mass diffusion.
The correct update for inner grid points is C_new(i,j) = C_old(i,j) + dt * (D_x*(C_old(i-1,j)-2*C_old(i,j)+C_old(i+1,j))/dx^2 +...

10 dagar ago | 0

| accepted

Answered
Indices shown in plot are off
My guess is that the x-axis has a resolution of 10.

12 dagar ago | 0

Answered
issue in calculation of wave speed
The below code will at least give you the correct update of the solution. You don't initialize "half_max_positions" ; that's wh...

12 dagar ago | 0

Answered
Minimize difference between two data sets
Use [output] = [method](@(AB) my_func(AB(1),AB(2)), [A B]) instead of [output] = [method](@(A,B) my_func(A,B), [A B])

12 dagar ago | 0

| accepted

Answered
1D advection diffusion with pdepe
You mean something like this ? X = linspace(0, 1, 100); W = linspace(0, 2, 30); m = 0; sol = pdepe(m, @pdefun, @ic, @bc, X, ...

12 dagar ago | 0

| accepted

Answered
traveling waves of fisher kpp equation
Your equation reads u_{t} = - (u_{xx}+u_{yy}) + u(1-u) You miss the minus sign in your code (at least if the equation you wrot...

12 dagar ago | 0

Answered
Summing results at the end of a loop
x = linspace(0, 90.*(10.^-3), 100); w = [7.5.*(10.^-3),7.5.*(10.^-3),7.5.*(10.^-3)]; u = [(8.883).*(10.^-3),(8.883).*(10.^-3),...

13 dagar ago | 0

Load more