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integral using "int" function
Your code to produce g1, g2 and g3 does not matter. You don't get analytic expressions for the antiderivatives of g1, g2 and g...

circa 2 anni fa | 0

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Ode23 is not outputting solutions at the times I specified between t0 and tf in tspan=[t0, t1, t2..., tf]
If you use the "soln" structure as result, ode23 only respects start and end point from your tspan vector. After the integrator...

circa 2 anni fa | 0

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f(x) = x^2/3(3-x^2)(x-4). How do I enter this function in MATLAB?
Replace c = solve(fx); by c = solve(fx*x^(1/3)==0,'Maxdegree',3);

circa 2 anni fa | 0

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Problem with integration: there is a pole on a contour
In the usual sense, your integral does not exist. But you can compute its principal value: syms z syms t real f = (z^2+3*z+2...

circa 2 anni fa | 2

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Integral2 seems to substitute non-scalar values of variable into integrand. Why?
"integral2" usually calls the function to be integrated with matrices of the same size for t1 and t2 to make the necessary funct...

circa 2 anni fa | 2

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error when using lsqnonlin to function containing fzero function
"K" is a vector because "fraction" is a vector. Thus the "y" you compute in "denaturationfun" is a vector. But "fzero" cannot so...

circa 2 anni fa | 0

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I'm trying to solve jeffry hamel equation using RK4 but it's not giving output as expected.
s = 6; Kn = 0.1; U20 = -1; U2 = fsolve(@(U2)fun_shoot(U2,s,Kn),U20) [Y,Z] = fun_odes(U2,s); plot(Z(:,1),Y) xlabel('U') yl...

circa 2 anni fa | 1

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Generalised solution to a n-order system of equations
Here is my code, that provies a range of answers from a to b, inclusive. Besides that you shouldn't give the same names to the ...

circa 2 anni fa | 0

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Unconstrained minimisation problem with a complicated range
I'll formulate the problem for one property - a generalization to three properties is obvious. I'll assume that each of the 3*N...

circa 2 anni fa | 0

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I'm trying to solve a 2nd order ode with ode45, but have no idea where to start.
After dividing your equation by t, you can just follow the example Solve Nonstiff Equation under https://uk.mathworks.com/hel...

circa 2 anni fa | 0

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How to solve for 1D non homogenous ODE by Finite element method
I usually set A(1,1) = 1, F(1) = 0, A(N+1,N+1) = 1, F(N+1) = 2 and only loop from 2 to N here: %%%% Assembling %%%% for i=1:...

circa 2 anni fa | 0

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How do I change my scalars to fit my normpdf?
xq = 0:100; mu = [25, 50].'; sigma = [5, 10].'; ndist = 1./(sigma*sqrt(2*pi)).*exp(-((xq-mu)./sigma).^2); plot(xq,ndist) g...

circa 2 anni fa | 1

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Risposto
newton raphson for nonlinear heat equation scheme
Why don't you use "pdepe" ? Ten lines of code maximum, and you are done. To get rid of the error in the above code, replace % ...

circa 2 anni fa | 0

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How to quantify shape similarity between two vectors.
Shift the curves by their means first so that the means of all objects lie in the origin (0). This will remove translational dif...

circa 2 anni fa | 0

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input appears to be a function and variable and exceeds the number of array elements???
You define a string of length 59 named "input". Then you want to use "input" as the MATLAB command to request user input for "ag...

circa 2 anni fa | 0

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How to solve for the maximum or minimum value of a symbolic function
syms Vr theta_r Vse rho gamma positive real syms X_r positive real syms n_t positive real syms Vs positive real syms x y l...

circa 2 anni fa | 0

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Risposto
An error 'matlabexecutionerror' occurred when i use 'min' in type optim.problemdef.OptimizationExpression
"min" is not a supported operation for optimization variables: https://uk.mathworks.com/help/optim/ug/supported-operations-on-o...

circa 2 anni fa | 0

Risposto
How do I make x the subject of this function?
D = 0.05; Y = 0.2170535; f = @(X) Y - (D^2 * acos(1-(2*X/D)) - sqrt(X.*(D-X) .* (D-2*X)) / (pi*D^2)); X = 0:0.001:0.025; plo...

circa 2 anni fa | 0

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Is there a function to create the P-P plot in Matlab, to compare two cumulative distribution functions against each other?
rng default; % for reproducibility a = 0; b = 100; nb = 50; % Create two log-normal distributed random datasets, "x" and "y...

circa 2 anni fa | 1

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give correction to my code for finding value of three variable by newton rapson iteration.
The residual for your initial guess is [191,44,534], the residual for the last column of Z is [75e-9,10e-9,9e-12]. Thus obviousl...

circa 2 anni fa | 0

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Adjacency matrix for ODE45
k = [0,0.1,0.2,0]; reshape(k,2,2) I think you want the reshaped matrix to be reshape(k,2,2).'

circa 2 anni fa | 0

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Risposto
Numerical solution for the heat equation does not match the exact solution
I cannot believe that the value for alpha has no influence on the solution. So I guess that the exact solution maybe holds for...

circa 2 anni fa | 2

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Risposto
When i remove the element wise divison of the RLC beacuse RLC is single array it gives me this error Index exceeds the number of array elements. Index must not exceed 1.
You must keep the elementwise division. So Change Kf_LMax = Kf_Max * (RLC / (1 + RLC)); to Kf_LMax = Kf_Max * (RLC ./ (1 + R...

circa 2 anni fa | 0

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Computation of left eigenvectors of polyeig
Hint: If you solve for s and x satisfying (A0.'+s*A1.'+...+s^p*Ap.')*x = 0, using polyeig(A0.',A1.',...,Ap.') , it follows...

circa 2 anni fa | 0

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Setting linear constraints for fmincon,
If real(gamma) and imag(gamma) are vectors of optimization variables, the constraints PS(gamma) - t <= 0; - PS(gamma) - t <...

circa 2 anni fa | 0

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How to plot temperature along a defined line within a 2D temperature field
Does this help ? https://uk.mathworks.com/matlabcentral/answers/52403-plot-solution-of-pde-toolbox-on-a-line-or-submanifold

circa 2 anni fa | 0

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Risposto
Both function plots start at 1, even though I have time step as t=0:6
Use plot(t,v) plot(t,a) instead of plot(v) plot(a)

circa 2 anni fa | 0

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Risposto
in this code for finding root by newton raphson method i gave derivative of f in g. instead of giving derivative directly how can i get derivative using any code?
syms x f = x^4-x^2-80; g = jacobian(f); f = matlabFunction(f) g = matlabFunction(g)

circa 2 anni fa | 0

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Risposto
how to plot two nonlinear functions
x = -10:0.1:10; y = 0:0.1:20; [X,Y] = meshgrid(x,y); Z1 = X.^2+X.*Y-10; Z2 = Y+3*X.*Y.^2-57; % Visualize the two surfaces ...

circa 2 anni fa | 2

Risposto
Using symbolic solver, I seem to not be able to get a system of equations that give me a desired answer. Does a solution not exist?
It's the same situation as in your other problem: https://uk.mathworks.com/matlabcentral/answers/2138791-how-can-i-find-a-uniqu...

circa 2 anni fa | 1