Torsten

Last seen: Today | Aktiv seit 2013

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Why does the value of tolerance stop at n=2 (third value of the iteration) within the while loop?
Maybe you mean tol = 1e-7 instead of tol = exp(-7) ? However: It's correct that MATLAB quits the while-loop after three val...

etwa 6 Stunden vor | 1

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Minimization linprog constraint no feasible solution
The last equality constraint says that you want 0*x1 + 0*x2 + 0*x3 + 0*x4 + 0*x5 + 0*x6 + 0*x7 + 0*x8 = 6.6, thus 0 = 6.6 ... ...

etwa 19 Stunden vor | 0

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4th order Runge Kutta Method Differential System
Note that COne and CTwo are given in muF - thus they should be prescribed as 1000e-6 in your code, I guess. COne = 1000e-6; C...

etwa 19 Stunden vor | 0

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Error using odearguments Vector Length issue
s3 = s(3) s5 = s(5) instead of s3=(s) s5=s(4)

3 Tage vor | 0

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Newton Forward difference method
Three coding errors: % Confirmed case Sample data points (x, y) data = [ 1, 88; 2, 49; 3, 47; 4, 8; 5, 34; 6, 762; 7, 98; 8, ...

3 Tage vor | 0

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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...

3 Tage vor | 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...

4 Tage vor | 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);

4 Tage vor | 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...

4 Tage vor | 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...

5 Tage vor | 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...

5 Tage vor | 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...

5 Tage vor | 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 ...

6 Tage vor | 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...

8 Tage vor | 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...

8 Tage vor | 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:...

8 Tage vor | 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...

9 Tage vor | 1

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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 % ...

9 Tage vor | 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...

9 Tage vor | 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...

9 Tage vor | 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...

10 Tage vor | 0

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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...

11 Tage vor | 0

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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...

12 Tage vor | 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...

12 Tage vor | 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...

13 Tage vor | 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).'

14 Tage vor | 0

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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...

14 Tage vor | 2

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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...

14 Tage vor | 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...

15 Tage vor | 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 <...

15 Tage vor | 0

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