Respondida
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 meses hace | 2

| aceptada

Respondida
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) ...

3 meses hace | 0

Respondida
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...

3 meses hace | 2

Respondida
Programming wave dispersion equation
Code taken from https://uk.mathworks.com/matlabcentral/fileexchange/156009-wavelength-calculation-based-on-dispersion-relations...

3 meses hace | 0

| aceptada

Respondida
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...

3 meses hace | 0

| aceptada

Respondida
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...

3 meses hace | 1

Respondida
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 ...

3 meses hace | 0

Respondida
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...

3 meses hace | 0

Respondida
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([...

3 meses hace | 1

Respondida
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.

4 meses hace | 0

Respondida
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...

4 meses hace | 0

Respondida
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...

4 meses hace | 0

| aceptada

Respondida
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"],... ...

4 meses hace | 1

| aceptada

Respondida
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...

4 meses hace | 1

Respondida
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 ...

4 meses hace | 0

Respondida
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.

4 meses hace | 1

| aceptada

Respondida
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...

4 meses hace | 0

| aceptada

Respondida
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...

4 meses hace | 1

Respondida
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...

4 meses hace | 2

| aceptada

Respondida
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...

4 meses hace | 0

Respondida
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 ...

4 meses hace | 0

Respondida
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...

4 meses hace | 0

Respondida
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...

4 meses hace | 0

Respondida
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...

4 meses hace | 2

Respondida
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...

4 meses hace | 0

| aceptada

Respondida
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)...

5 meses hace | 1

| aceptada

Respondida
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...

5 meses hace | 1

| aceptada

Respondida
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); ...

5 meses hace | 0

| aceptada

Respondida
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

5 meses hace | 1

Respondida
define 300 function calls x1(t)---x300(t)
You shouldn't use the way described here https://uk.mathworks.com/help/symbolic/solve-semilinear-dae-system.html to define a D...

5 meses hace | 0