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Inverse Problem, I have unknowns to solve it
L and N cannot be estimated separately. As long as phi is a single scalar value , L*phi + N must be treated as only one parame...
8 días hace | 0
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expanded vs unexpanded polynomials in symbolic integrals
Without giving the limits of integration, "int" returns an arbitrary antiderivative for the function you want to integrate. But ...
15 días hace | 0
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symbolic integrate and plot a function of one variable
syms x(u) y(u) g(u) C1 C2 v uref g(u) = 159648450049389632/(3991211251234741*(4 - (C1 + 2*u + 3)^(1/2))^(1/2)) + 14; x = C2*ex...
16 días hace | 0
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Trying to make a goal seek like program using fsolve?
clear all; close all; clc f= @(x) Average1(x)-65; engineering= 30; % Intiall estimate engineering = fsolve(f,engineering) ...
17 días hace | 0
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numerical Instabilities for bessel functions
Although it's slow, the full Newton method seems to work in this case (except for one value of X_kRE): clear all; close all; ...
17 días hace | 0
i want to add cplex and yalmip on my mac how ?
This is the problem-based MATLAB code to set up your problem. I might have done some mistakes translating your constraints, but ...
18 días hace | 1
Setting constraint between estimation parameters in nonlinear grey box estimation
I doubt that you can set lower and upper bounds on parameters as nonlinear functions of other parameters. In my opinion, Paramet...
20 días hace | 0
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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...
22 días hace | 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...
23 días hace | 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...
29 días hace | 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]);
alrededor de 1 mes hace | 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 -...
alrededor de 1 mes hace | 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, ...
alrededor de 1 mes hace | 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...
alrededor de 1 mes hace | 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...
alrededor de 1 mes hace | 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...
alrededor de 1 mes hace | 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''...
alrededor de 1 mes hace | 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...
alrededor de 2 meses hace | 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...
alrededor de 2 meses hace | 0
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Extracting coefficients from symbolic expression
syms P121 P131 P151 P122 P132 P152 cosdphi12over2 cosdphi13over2 cosdphi15over2 sindphi12over2 sindphi13over2 sindphi15over2 P12...
alrededor de 2 meses hace | 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 ...
alrededor de 2 meses 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...
alrededor de 2 meses hace | 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 ?
2 meses hace | 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...
2 meses 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 ...
2 meses hace | 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 meses hace | 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 meses 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...
2 meses hace | 2
Programming wave dispersion equation
Code taken from https://uk.mathworks.com/matlabcentral/fileexchange/156009-wavelength-calculation-based-on-dispersion-relations...
2 meses 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...
2 meses hace | 0
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