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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...

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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: ...

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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...

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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...

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Confidence interval in fit
Call "confint" (for the parameters) or "predint" (for the fit) from the command line with the wanted confidence level: https://...

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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 ...

8개월 전 | 0

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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...

8개월 전 | 1

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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 ...

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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.

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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....

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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 ?

9개월 전 | 1

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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)...

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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...

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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...

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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...

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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; ...

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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...

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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 = ....

9개월 전 | 0

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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...

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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 ...

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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...

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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...

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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 ...

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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...

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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) ...

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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; ...

11개월 전 | 1

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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 ...

11개월 전 | 1

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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...

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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...

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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...

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