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Feeds
Saving a matrix with a variable that could take any value
Either define the matrix as a function handle SM = @(L)[12/L^3 6/L^2 -12/L^3 6/L^2; 4/L -6/L^2 2/L 6/L^2; ...
1 giorno fa | 1
| accettato
Save variable number in matrix for later iteration
Maybe like this ? I'm not sure whether you want to take the elements of C and J according to the order of the elements in I or...
3 giorni fa | 1
| accettato
How to solve dy/dt=A(t)*y where y is a vector (3 elements) and A is 3x3 matrix with time dependent elements.
The code should somehow look like: Y0 = [1;0;0]; tspan = [0 1]; v1 = ...; % your first vector v1 needed to compute A v2 = ....
4 giorni fa | 0
Please help me to run this simple code
Your solution for rr(3) becomes complex-valued. For complex-valued functions, you can plot e.g. their real part, their imagina...
5 giorni fa | 0
How do I add summation to a symbolic equation in order to integrate across set bounds?
Use logncdf: https://uk.mathworks.com/help/stats/logncdf.html Use to compute f_act with the help of "logncdf" and use the ...
6 giorni fa | 1
| accettato
Implicit expansion with arrayfun (cpu vs gpu)
F3 = cellfun(@myadd, [{x}], [{y}], 'UniformOutput', false) will work. Arrayfun tries to apply "myadd" to [first element of x,f...
18 giorni fa | 1
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...
circa un mese fa | 0
| accettato
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 ...
circa un mese fa | 0
| accettato
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...
circa un mese fa | 0
| accettato
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) ...
circa un mese fa | 0
| accettato
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; ...
circa un mese fa | 1
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 ...
circa 2 mesi fa | 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...
circa 2 mesi fa | 0
| accettato
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...
circa 2 mesi fa | 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...
circa 2 mesi fa | 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...
circa 2 mesi fa | 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]);
2 mesi fa | 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 -...
2 mesi fa | 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, ...
2 mesi fa | 0
| accettato
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...
2 mesi fa | 0
| accettato
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...
2 mesi fa | 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...
2 mesi fa | 0
| accettato
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''...
2 mesi fa | 1
| accettato
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...
3 mesi fa | 0
| accettato
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...
3 mesi fa | 0
| accettato
Extracting coefficients from symbolic expression
syms P121 P131 P151 P122 P132 P152 cosdphi12over2 cosdphi13over2 cosdphi15over2 sindphi12over2 sindphi13over2 sindphi15over2 P12...
3 mesi fa | 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 ...
3 mesi fa | 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...
3 mesi fa | 1
| accettato
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 ?
3 mesi fa | 0
| accettato
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...
3 mesi fa | 0
| accettato
