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Help implementing 4th-order Runge–Kutta for ODEs with Dirac impulses (discontinuous system)
Look at figure 3 (a) and (b) of the article. Each time the curve for U becomes discontinuous, a dosing is applied to the mice. I...
2 days ago | 0
Defining a function in one file and using it in a second file
The calls must be for i = 2:NumTimesteps % for each timestep % 1. Soil Respiration % as per Reich, 2002 SoilResp_gC = S...
3 days ago | 0
real part of eigenvalues vs damping plot
I don't know what you try to plot, but the cell matrix lamda below should contain all information you need. mr=306, mj=141.5, m...
9 days ago | 0
First value of an array does not display with a decimal
If you like it more, you can use sprintf('%f %f %f',[x, y, z]) instead of disp([x y z]);
13 days ago | 1
How to integrate a control system by ode45 with PID control input ?
Add a second differential equation dV/dt = P.Xd - X with initial condition V(0) = 0 Then V(t) = integral_{0}^{t} (P.Xd -...
15 days ago | 0
Matlab's polyfit gives different results when the independent variable is integer than when the independent variable is floating point. Why is that so?
To be consistent, you must either use numDataPointsMinutes = [0,1,2,3, ... 27359]; instead of numDataPointsMinutes = [1,2,3, ...
18 days ago | 0
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How to remove the time dependence of an equation?
Use fimplicit(eq_14(t)==0,"r","LineWidth",2) instead of fimplicit(eq_14==0,"r","LineWidth",2) Why do you use a time-dependen...
18 days ago | 0
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Seeking advice from experts
Use one of the below codes instead. You can't nest functions within a script, but only within another function. So either defi...
19 days ago | 0
Newtonian Mechanics vector solution needed to find the range of forces (P) that satisfy Fnetx = 0
Your search will never find a value for P for which Fnetx is exactly 0. Better use "fsolve" to solve for the corresponding roo...
23 days ago | 0
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can anyone help me. I am getting error of the following problem
Let's ignore the fifth differential equation in your code for a moment. Then you set up code for the differential equation y''...
23 days ago | 1
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Monitoring Variables Defined Within Functions to Debug
After the variable is computed, you can list the variable's name by itself on it's own line in your function code, with no semic...
28 days ago | 0
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ddesd giving NaN for all state variables beyond time step 1.
The history function has to cover values for t that are negative (because y6 becomes large and you have to supply y1(t-y6)). But...
30 days ago | 0
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Extracting coefficients from symbolic expression
syms P121 P131 P151 P122 P132 P152 cosdphi12over2 cosdphi13over2 cosdphi15over2 sindphi12over2 sindphi13over2 sindphi15over2 P12...
1 month ago | 1
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 month ago | 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...
1 month ago | 1
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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 ?
1 month ago | 0
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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...
1 month ago | 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 ...
1 month ago | 1
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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...
2 months ago | 2
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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) ...
2 months 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...
2 months ago | 2
Programming wave dispersion equation
Code taken from https://uk.mathworks.com/matlabcentral/fileexchange/156009-wavelength-calculation-based-on-dispersion-relations...
2 months ago | 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...
2 months ago | 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...
2 months 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 ...
2 months 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...
2 months 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([...
2 months 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.
2 months 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...
2 months 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...
2 months ago | 0
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