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How do I set up these three water application events in MATLAB and incorporate them into the boundary conditions?
The usual way to discretize the diffusion equation du/dt = d/dz (D(u)*du/dz) for a given flux q = -D*du/dz at z = z_0 on a gri...
2 días hace | 0
Kinks/discontinuities in pdepe solution
Are you sure you want to solve your problem in cylindrical coordinates (since you set m = 1 in the call to "pdepe") ? Tighten y...
4 días hace | 1
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obtain an equation for the curve joining maximum points, using an appropriate interpolation or “curve fitting” process???
Follow @Matt J 's advice and maximize y=v0*sin(angle_rad)*t - 0.5*g*t.^2 over t for a given angle "angle_rad". For comparison: ...
5 días hace | 0
How do I solve coupled PDEs and ODEs together using pdepe?
The usual setting in this case is c = 1 f = 0 s = according to your ODE pl = 0 pr = 0 ql = 1 qr = 1 for the ODEs. This...
7 días hace | 0
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What are possible causes of "Unable to meet integration tolerances without reducing the step size below the smallest value allowed" when calling ode15s() from Simulink?
What are possible causes of "Unable to meet integration tolerances without reducing the step size below the smallest value all...
11 días hace | 0
Confidence interval in fit
Call "confint" (for the parameters) or "predint" (for the fit) from the command line with the wanted confidence level: https://...
11 días hace | 1
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what's wrong with matlab dsolve ?
If a > 0, insert C1 = const + log(a) in MATLAB's solution for the free constant C1, and you will recover your solution. For a ...
12 días hace | 0
Curve fitting confidence intervals - discrepancy in manual CI plot and predint plot
Did you read https://uk.mathworks.com/help/curvefit/confidence-and-prediction-bounds.html ? The formulae to compute the diffe...
13 días hace | 1
How do I find if a point is within the volume of a rotated ellipsoid
Apply the "anti-rotation" of the ellipsoid to the point P=(x,y,z) and check whether the image P'=(x',y',z') you receive lies in ...
29 días hace | 1
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In my code, I am getting plot on lambda=1, but rest plots are not reflecting. Please help to get all figures.
The results for the last 3 values of lambda are NaN (see above) - thus they are not plotted.
alrededor de 1 mes hace | 0
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Wanting all results for an algebraic equation that is within a function .
One method: Define the algebraic variables as additional solution variables to the ODE system. This results in a DAE-system (i....
alrededor de 1 mes hace | 0
Simulating a system of damped PDEs with the Matlab PDE toolbox.
Did you try to set the problem as u1_dot = u3 u3_dot = delta(u1) + J1 u2_dot = u4 u4_dot = -u4 + delta(u2) +J2 ?
alrededor de 1 mes hace | 1
pdepe fails to solve PDEs with absorbing boundaries
This is what I get from AI when I type in your error message: This error occurs because a third-party package (usually MatCont)...
alrededor de 2 meses hace | 0
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different in Poisson distribution test
"kstest" is not applicable since the Poisson Distribution is a discrete, not a continuous distribution. Since the example "Test...
alrededor de 2 meses hace | 1
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Find all roots of a transcendental equation
Quite a hack and no guarantee that you will find all roots in the specified region, but I think there is no better method for th...
alrededor de 2 meses hace | 0
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How to use the "Use weights for each response" option on simbiology model analyzer on a Fit program?
Did you study the example "Use Group-Specific Dosing Data for Parameter Estimation with Numeric Weights" under https://uk.mat...
2 meses hace | 0
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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; ...
2 meses hace | 1
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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...
2 meses hace | 1
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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 = ....
2 meses hace | 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...
2 meses hace | 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 ...
2 meses hace | 1
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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...
3 meses hace | 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...
3 meses 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 ...
4 meses 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...
4 meses 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) ...
4 meses 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; ...
4 meses hace | 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 ...
4 meses 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...
4 meses 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...
4 meses hace | 0
