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...

2 years 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...

2 years ago | 0

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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 ...

2 years ago | 0

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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 years ago | 0

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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...

2 years 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 = ...

2 years 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...

2 years ago | 0

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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 ...

2 years 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 + ...

2 years ago | 2

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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) -...

2 years 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...

2 years 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);

2 years 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 +...

2 years 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.

2 years ago | 0

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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...

2 years ago | 0

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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])

2 years 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, ...

2 years 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...

2 years ago | 0

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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),...

2 years ago | 0

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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(...

2 years 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...

2 years ago | 0

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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...

2 years ago | 0

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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 ...

2 years 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...

2 years 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, ...

2 years 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...

2 years ago | 0

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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...

2 years ago | 0

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I am unable to find the minimum value of function f in this optimization problem. The solver always returns 0 for all variables which is not possible. I am unable to correct.
The solution is correct: A*x <= b is satisfied, and since all elements in the f-vector are positive, 0 is optimal. Maybe you wa...

2 years ago | 0

Answered
int function is not working properly in matlab
Evaluate gamma(n_star_D3(i)+l_d+1) gamma(n_star_D3(i)-l_d) and you will see the reason. Consequently, Gff_D3(i)...

2 years ago | 0

Answered
Negative sign produced by "functionalDerivative" - why?
As you can see here at the bottom of the page https://uk.mathworks.com/help/symbolic/sym.functionalderivative.html functionalD...

2 years ago | 0