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**Feeds**

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

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

Plot between Nu vs Ra

Replace Ra_values = 10:100:100000; by Ra_values = (10:100:100000).';

2 hours ago | 0

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

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

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

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

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

| accepted

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

| accepted

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

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

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

| accepted

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

| accepted

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

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

| accepted

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

| accepted

Indices shown in plot are off

My guess is that the x-axis has a resolution of 10.

9 days ago | 0

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

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

| accepted

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

| accepted

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

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

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

| accepted

"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

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

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

| accepted

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

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

| accepted

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

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