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Feeds
Iterative of Nonlinear Functions
Why do you use "solve" to get t1,...,t15 ? You can directly solve for the unknowns because you use the explicit Euler method to ...
1 día hace | 0
Possible bug in coneprog.m function
This works for dense matrices/vectors, but in sparse mode, it gives exitflag = -7 as above. Maybe it's worth asking MATLAB suppo...
4 días hace | 1
| aceptada
How can we plot the same time history plot two times but the second time with a time delay of 2 sec?
You mean t = 0:0.1:20; p = t.^2; hold on plot(t,p,'b') plot(t+2,p,'r') hold off grid on ?
8 días hace | 0
plotting 2 figures in same for loop
figure hax1=axes; hold(hax1,'on') figure hax2=axes; hold(hax2,'on') x=1:5; for i=1:6 if rem(i,2)==0 scatter...
9 días hace | 0
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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 ...
12 días hace | 1
| aceptada
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...
14 días hace | 2
| aceptada
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) ...
18 días hace | 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...
20 días hace | 2
Programming wave dispersion equation
Code taken from https://uk.mathworks.com/matlabcentral/fileexchange/156009-wavelength-calculation-based-on-dispersion-relations...
21 días hace | 0
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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...
22 días hace | 0
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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...
22 días hace | 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 ...
22 días hace | 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...
24 días hace | 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([...
25 días hace | 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.
alrededor de 1 mes hace | 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...
alrededor de 1 mes hace | 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...
alrededor de 1 mes hace | 0
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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"],... ...
alrededor de 1 mes hace | 1
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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...
alrededor de 1 mes hace | 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 ...
alrededor de 1 mes hace | 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.
alrededor de 1 mes hace | 1
| aceptada
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...
alrededor de 1 mes hace | 0
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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...
alrededor de 1 mes hace | 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...
alrededor de 2 meses hace | 2
| aceptada
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...
alrededor de 2 meses hace | 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 ...
alrededor de 2 meses hace | 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...
alrededor de 2 meses hace | 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...
alrededor de 2 meses hace | 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...
alrededor de 2 meses hace | 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...
alrededor de 2 meses hace | 0
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