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Solving differential equations with state variables and co-states
This code works, but gives no solution for the parameters given. %% Title: Solving Hamiltonian Objective Function using system ...
20 hours ago | 0
Finding if the current data value is greater than the previous value
It would help if you include the GDF-file. Without further information, I'd suggest T = readtable ("GDF.xlsx"); A = table2arr...
3 days ago | 2
| accepted
How to multiply different size arrays and multiply each element by each element?
If nothing helps, make a 4-fold nested loop. for i=1:numel(Span) for j = 1:numel(MAC) for k = 1:numel(CoM) ...
7 days ago | 0
Combine non integer time steps into daily values
@Cristóbal Looking at the volume values, I'm almost sure that these values are already cumulative values. Why should the increa...
8 days ago | 2
Programming wave dispersion equation
Code taken from https://uk.mathworks.com/matlabcentral/fileexchange/156009-wavelength-calculation-based-on-dispersion-relations...
10 days ago | 0
| accepted
Modelling a system of differential equations with recurrences in matlab
N = 20; k = 1; a = 1; b = 1; c = 1; d = 1; u0 = zeros(N,1); udot0 = 0.5*ones(N,1); v0 = zeros(N,1); vdot0 = 0...
11 days ago | 0
| accepted
How can received my license?
Either through the IT department of your university or - if you have an individual licence - by contacting MATLAB support: http...
11 days ago | 1
Please help me to solve this simple error
@Walter Roberson answered the question about your MATLAB error. Concerning the problem you try to solve: I assume d1, d2 are ...
11 days ago | 0
Curve fitting with a custom equation
Only round brackets are allowed in your expression. But maybe there are additional problems. If the code does not work after r...
13 days ago | 0
Trying to figure out a algorithm to filter out some data, since I dont have any additional toolbox.
load("eeandv.mat") tol = 0.005; idx = abs(diff(e)) <= tol; e = e(idx); v = v(idx); plot(v,e) grid on; grid minor; xlim([...
14 days ago | 1
I want to avoid fractions in my answer to the null space
Insert for i = 1:size(N_A,2) [~,d] = numden(N_A(:,i)); N_A(:,i) = N_A(:,i)*lcm(d); end after computing N_A.
19 days ago | 0
Prevent "any Matlab service" from loading on Windows 11 startup.
Follow the instructions given here: https://uk.mathworks.com/matlabcentral/answers/101038-why-is-matlab-always-running-in-the-b...
24 days ago | 0
why does set(gca) not working
The set command must be placed after the plot command, not before: FONT_SIZE = 16; max_iter = 10; x = 1:max_iter; % this is t...
26 days ago | 0
| accepted
Naming Table Variables of a File
load("T.mat") T1 = splitvars(T); T1 = renamevars(T1,["rows_1" "rows_2" "rows_3" "rows_4" "rows_5" "rows_6"],... ...
26 days ago | 1
| accepted
Error using countOnes = sum(num); when trying to count how many zeros and ones are randomly generated.
Works in R2025A (see above). I suspect that somewhere in your code, you define a variable with name "sum". Rename it because it...
27 days ago | 1
Please i need to plot 3 dimension figure with (x axis is x, y axis is gamma function) and z axis is value of u for this simple attached relation
We don't know your problem, but it should work somehow like this. What do you mean by "the y-axis is the gamma function" ? Do ...
27 days ago | 0
Plot: index exceeds array bounds ("Index in position 1 exceeds array bounds. Index must not exceed 1.")
Rename the struct "plot" which appears in your workspace. It's probably in conflict with MATLAB's "plot" function.
1 month ago | 1
| accepted
Plotting sum of two vectors
%Parameters or =0.2; oc = 0.2; gamma = 0.01; gam=0.01; Gamma = 1; Gamma1 = Gamma; Gamma2 = Gamma; Gamma3 = 9/10; Gamm...
1 month ago | 0
| accepted
ilaplace doesn't handle tanh()
You mean syms s T P2 = ilaplace( 1/s*(exp(s*T/4)-exp(-s*T/4))/(exp(s*T/4)+exp(s*T/4)) ,s); Tsteps = 0.1:0.5:20; num = vpa(su...
1 month ago | 1
Fitting 8 equations simultaneously with three parameters
If all 8 equations are linear in the fitting parameters like in your example from above, "lsqlin" instead of "lsqnonlin" would b...
1 month ago | 2
| accepted
Partial Differential equation: Createpde. f as afunction
Take a look at the example "Coefficient Handle for Nonconstant Coefficients" under https://uk.mathworks.com/help/pde/ug/pde.p...
1 month ago | 0
Neumann boundary condition in a diagonal matrix
For fun, I computed eigenvalues and eigenfunctions for the full region with boundary condition u = 0 and for the quarter region ...
1 month ago | 0
Neumann boundary condition in a diagonal matrix
The Laplace operator is discretized as (u(x+h,y) - 2*u(x,y) + u(x-h,y))/h^2 + (u(x,y+h) - 2*u(x,y) + u(x,y-h))/h^2 If y = 0 an...
1 month ago | 0
Error while running my objective function by fmincon with nonlinear constraint for calculate optimization coordination overcurrent relay
So far, it seems to work. The constraint function is missing. % main_optimization.m % The main script for solving protective...
1 month ago | 0
Please help explain it
1) asks you to plot y1(x) = x + cos(x), y2(x) = -0.5 and y3(x) = 0.5 and see where y1 and y2 resp. y1 and y3 intersect. 2) a...
2 months ago | 2
I'm encountering the following error when I run my main program.
Do you see the problem ? a = rand(4,5) a(1:3,4:6) "ymax" is bigger than the second dimension of the array "topo", namely 1440...
2 months ago | 0
| accepted
Rotate 3D mesh plot to show 2D view of X data on vertical axis and Z data on horizontal axis
x = -2:0.1:2; y = 0:0.1:1; [X,Y]=meshgrid(x,y); Z = X.^2+Y.^2; mesh(Z,Y,X) xlabel('Z') ylabel('Y') zlabel('X') view(0,0)...
2 months ago | 1
| accepted
Matlab numerical simulation for ode system by changing the parameter value in range graph not running error coming
Your ODE system is stiff. Use "ode15s" instead of "ode45". The reason for the error you receive seems to be that you interrupte...
2 months ago | 1
| accepted
function input arguments error
Don't use isreal as a variable name: isreal is a MATLAB function that you overwrite this way. [y, is_real] = myquad(1, -2, 1); ...
2 months ago | 0
| accepted
How to assign the multiple outputs of a function to a single vector AVOIDING TO MANUALLY ASSIGN EACH OUTPUT?
https://uk.mathworks.com/matlabcentral/answers/1808900-multiple-outputs-of-a-function-into-a-single-vector
2 months ago | 1
