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Torsten


Last seen: Today Active since 2013

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

2 hours 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_{...

2 hours ago | 0

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

2 hours 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...

18 hours 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...

20 hours ago | 0

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 ...

1 day 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...

2 days 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...

3 days ago | 0

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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 = ...

3 days ago | 1

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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...

3 days 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 ...

4 days 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 + ...

4 days ago | 0

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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) -...

5 days ago | 1

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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...

5 days ago | 0

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

6 days ago | 0

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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 +...

7 days ago | 0

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

9 days 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...

9 days 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])

9 days ago | 0

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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, ...

9 days ago | 0

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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...

9 days 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),...

10 days ago | 0

Answered
calculate the normal of a 3D plane
I would like to know if it is correct to calculate the normal of this plane in the following way: N = cross(P(1,:) - P(2,:), P(...

10 days ago | 0

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Answered
"Empty sym" when solving a system of linear equations with different conditions
Your system only has a (nontrivial) solution if i = 1. In this case, the solution is given as below. syms Z1A Z2A Z3A Z4A Z1B Z...

10 days ago | 0

Answered
Temperature profile in a pipe flow with Matlab pdepe solver
I corrected as much as I could, but the computation of Q looks different in your code in comparison to the article. %% Main cod...

11 days ago | 0

Answered
Substitute partial differential into symfun
syms G(h) h(t) t Q = G(h) dGdt = diff(Q,t) % -> D(G)(h(t)) occurs s = children(dGdt) % Now define G(h) and derive: G ...

11 days ago | 1

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Answered
Using a loop to add rows to a struct, but the counter overwrites the rows.
I don't know how "trial" and "blockInfo" are organized. Here is one suggestion: for ifile = 1:3 for s = 1:nTrials struc...

11 days ago | 0

Answered
I am trying to perform a simple operation FOR loop. I think I am not able to get the indexing right.
%% why does not the following operation work Because the numbers 1,2 and 3 in t1, t2 and t3 are not indices you can loop over, ...

11 days ago | 0

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Answered
Kelvin functions ker kei functions evaluation
The value kei(0) = -pi/4 only exists in the limit : syms x a = exp(pi*1i/4); limit(imag(besselk(0,a*x)),x,0,"right") limit(i...

12 days ago | 0

Answered
constrained optimization with Matlab, symbolic function
If your function f is symbolic, you first have to convert it to a numerical function by using "matlabFunction". k_tot = ...; a...

12 days ago | 0

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