Community Profile # Torsten

Last seen: Today 2013년부터 활동

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How can i use this vector in my ODE function?
Integrate from t=0 to t=10 and use u = 30. Restart the ode solver with the solution at t = 10 and integrate from t=10 to t = 20...

대략 15시간 전 | 0

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Simulating a 1D Random Walk
% Step 2: Plot the entire trajectory for a single random walk N = 100; % Number of steps single_trajectory = simulateRandomWal...

대략 17시간 전 | 0

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How to plot different length vectors against each other?
However the x vector has a length of 113 compared to 1849 for y because of the differences in timestep. Solve for x and y toget...

대략 18시간 전 | 0

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Error using linprog (line 369)

대략 24시간 전 | 0

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95% confidence bounds from logistic curve (curve fitter) give different results to plotting via equation in script
It's not possible to just insert lower and upper bounds for the parameters into the model equation to get the curves for the con...

1일 전 | 0

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how to calculate the drivative of discretized ODE
After the line sol = ode45(@(t,u) dODE(t, u, par, tau, M,D), tspan, u0,options); you can compute the derivatives of the soluti...

1일 전 | 0

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There is an error when i run my 'subplot' command in MATLAB
Rename your script file "subplot.m" to something else. "subplot" is a reserved name in MATLAB.

1일 전 | 1

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You don't supply k1, k2, c1 and c2 to the objective function. If these are the parameters to be optimized, you don't need to pa...

1일 전 | 1

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1D HEAT CONDUCTION
In each time step, you have to solve the linear system of equations T(1,k+1) = Tleft T(i, k+1) - deltat/deltax^2*alpha* (T(i-...

2일 전 | 1

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Finding a definite integral
x = linspace(0,1,101); u = [0.1600 0.1600 0.1599 0.1599 0.1597 0.1596 0.1594 0.1592 ... 0.1590 0.1...

2일 전 | 0

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Compute a function that has Double summation
All the series involved are geometric series for which the finite and infinite sums are known: sum_{i=1}^{i=n} q^i = q * (1-q^n...

3일 전 | 0

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What does this mean: K12_global(1:3:6,1:3:6)?
Do you see what happens ? The new matrix K12 is formed of the elements (1,1),(1+3,1),(1,1+3) and (1+3,1+3) of the original mat...

3일 전 | 0

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Unable to meet integration tolerances without reducing the step size below the smallest value allowed (1.136868e-13) at time t.
I had to add the line global alpha pD K g_T IFN at the beginning of your program to make the code work because the above globa...

3일 전 | 0

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Numerical Differentiation using Finite Differences
h = 0.01; x = 0:h:2*pi; fx = sin(x); %df1 = (sin(x+h) - sin(h))/h; df1 = (sin(x+h) - sin(x))/h; df2 = (sin(x) - sin(x-h...

3일 전 | 0

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Efficiently evaluating ODE event that depends on only some variables
Use OutputFcn to check your condition after each successful time step. But I think it will be difficult to check for complanari...

3일 전 | 0

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Finding real and imaginary part of an equation
U = 0:0.1:10; P = sqrt((((20*U.^2)-15) + sqrt((400*U.^4)+ (1080*U.^2) + 25 -600 - 450 - (1125./U.^2)))./((36*U.^2) + 30)); Pim...

4일 전 | 0

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I have a code related to thermodynamic subject, i don't know how to run it in order to get the different plot out of it. for example plot (p,rho). plot of pressure vs density.
I think there is something wrong in the calculation of the compressibility factor. p = EOS(2.0,150) function p=EOS(rho,temp)...

4일 전 | 0

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compute sums by accumulating in a for-loop
sum(xprime(1:100-l)) This is a scalar. sum(xprime(1:100-l)).*xprime(1+l:100) This is a vector of length 100-(1+l)+1. (sum(xp...

4일 전 | 0

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Financial optimization of heston
Assuming that Price_SV returns a vector of the same size as P_data, your call would look somehow like fun =@(p)Price_SV(p(1), p...

4일 전 | 0

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I don't know why this code is saying, "Arrays have incompatible sizes for this operation."
Your vector of initial conditions is 6x1 y0 = [Pi; Si; Li; Ii; Ri; Bi]; but you only return a 5x1 vector in PSLIR dydt = [dPd...

6일 전 | 0

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Use off_diagonal = coefficient * ones(N-1, 1); instead of off_diagonal = coefficient * ones(N-2, 1); See the example "Create...

6일 전 | 0

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Apply fmincon nonlinear parameter inequality constraints into SimBiology for parameterization
function [c,ceq] = nonlincon(params) %Nonlinear inequality constraints c(1) = params(1)*params(2) - params(5)*params(7); % For...

6일 전 | 0

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Trouble with For Loop
for i = 1:35 dataN_(i) = ecg_data (:,i); mean_HR_subject(i) = ... ... end

6일 전 | 0

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Solving first order ODE with initial conditions and symbolic function
You solved it in your code. The second solution out of the three MATLAB returned is the "correct" one giving real-valued tempera...

6일 전 | 0

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It takes too long to run the program and in the end I get an error, could you tell me what the error is?
You can't change the input for x in function "campo_pendulo". So you can delete this part of your code because it doesn't influ...

6일 전 | 0

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Can someone help me check if I did this correctly?
Replace syms r a0 by syms r a0 positive to get the limits resolved.

6일 전 | 0

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Fixed Bed Adsorption Column Using Dimensionless Equations
The usual procedure is to define a grid 0 = X(1) < X(2) < ... < X(n) = 1 approximate the spatial derivative dA/dX in grid poin...

6일 전 | 1

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Index exceeds the number of array elements. Index must not exceed 4.
Maybe you mean for i = 1:nt1 G1 = [(1-(1/2-beta)*w2.*t1(i).^2)/(1+(beta*w2.*t1(i).^2)),t1(i)/(1+(beta*w2.*t1(i).^2)); ...

7일 전 | 1

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Empty plot is showing because of my er
What x-y data are given to build the Lagrange Polynomial and in which x-data do you want to interpolate ? I assume that x-y are ...

7일 전 | 0

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Any availiable function to find the Taylor series of multi variables function in Matlab?