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Torsten


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Answered
Having Trouble Using For-Loop Over Distributed Range with ODE45
delta1 = @(t) (t<=1200) delta0 = @(t) (t>1200) ODE = @(t,x,gamma,psi,beta) [delta1(t)*(-gamma)*x(1) + delta0(t)*psi*x(1); beta...

약 17시간 ago | 3

| accepted

Answered
Substitution of initial numerical values before odefunction
Use "matlabFunction" to convert every symbolic input to ODE45 into numerical function handles before calling ODE45.

약 18시간 ago | 0

Answered
How do I maximise Volume of a cylinder such that its Surface Area is less than 10 using fmincon by predicting only either radius or height but not both?
Not possible. Since r and h are interdependent, "fmincon" must be able to vary both and thus predict them simultaneously. Of co...

1일 ago | 0

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Answered
How to fix "Index exceeds the number of array elements (1)"?
for i=1:length(L) psi0= psi(i); L0 = L(i); To=[cosd(psi0) sind(psi0) 0; -sind(psi0) cosd(psi0) 0; 0 0 1]; Tg=[To ze...

2일 ago | 1

Answered
How to fit multivariable equation?
coeffs = [inputs, ones(size(inputs,1),1)] \ outputs

3일 ago | 0

Answered
I need help in this question please?
y(t) = sum_{i=0}^{Inf} a_i*t^i y'(t) = sum_{i=1}^{Inf} i*a_i*t^(i-1) y''(t) = sum_{i=2}^(Inf} i*(i-1)*a_i*t^(i-2) Set y''(t)+...

3일 ago | 0

Answered
How to calculate the (odd ,even) condition in the following Poisson distribution for p_z parameter? i need some help in the code bellow
function main p1 = 0.9; p2 = 0.8; q1 = 1-p1; q2 = 1-p2; z = 6; vec = zeros(1,z); vec(1:2:end) = q1/p1; v...

6일 ago | 1

Answered
Lagrange Interpolating Polynomials using Matlab
You must use a fitting tool, not an interpolation tool to solve your problem. Apply "polyfit" with x-values = Generation Output...

6일 ago | 0

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Answered
CDF of rain rate
https://stackoverflow.com/questions/36385036/how-to-make-a-cdf-from-a-histogram-in-matlab

6일 ago | 0

Answered
How to define a variable as an integer that's equal to or greater than zero?
rest = mod(struct_idx,4); if rest == 1 ... elseif rest == 2 ... elseif rest == 3 ... elseif rest == 0 ... end

6일 ago | 0

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Answered
Matlab code for delay differential equations
https://de.mathworks.com/help/matlab/delay-differential-equations.html

6일 ago | 1

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Answered
How to solve this equation which contains complex number, bessel equation and its derivative?
x0 = [2; 1]; fun = @(x)[real(1i*besselj(1,complex(x(1),x(2)))-complex(x(1),x(2)).*(besselj(0,complex(x(1),x(2)))-besselj(2,...

7일 ago | 1

Answered
Finite difference method - solving boundary conditions
y1(1) - 1.0 = 0 (y1(i+1)-2*y1(i)+y1(i-1))/dx^2 - (2*(y1(i+1)-y1(i-1))/(2*dx)/(1-x(i)) + y1(i)/(x(i)^2*(1-x(i))^2)*(y1(i)^2-1+(y...

9일 ago | 0

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Answered
How to enforce ode15s to solve a DAEs system with some state variables limited by a range?
The solution of your problem is uniquely determined by the equations you impose - you can't impose any further conditions on the...

10일 ago | 0

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Answered
Solving boundary value problem for nonlinear differential equation using method of collocation - Gauss sites
Up to my experience, the FORTRAN code "colnew" and "colsys" developed by Ascher are still the best bvp solvers available. Searc...

13일 ago | 0

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Answered
How to solve a set of DAEs with multiple dependent differential variables
The Euler equations are not thus easy to solve. You should consult a book on numerical methods for the equations of gas dynamic...

13일 ago | 0

Answered
Boundary condition in non-linear ODE
function du = ode4(eta,u) theta = u(1); Sr = u(2); % beta dtheta = u(3); % d(theta)/dr ...

13일 ago | 1

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Answered
How can I create a loop for this equation?
L = cumsum(demand); L = L./(1:numel(L)); L = L(4:12)

14일 ago | 1

Answered
How to solve a non-linear system of difference equations ?
Call "fsolve" repeatedly to get (S3,K2,E2), (S4,K3,E3), ... (S(t+2),K(t+1),E(t+1)) A(t) = A(1)*(1+a)^(t-1) is obvious.

15일 ago | 0

Answered
Nested loop problem with the second index
cp = zeros(length(cpx)*length(cpy),2); row = 0; for i = 1:length(cpx) for j = 1:length(cpy) row = row + 1; ...

16일 ago | 0

Answered
how to solve differential equation when the derivative is in right and left side of the equation.
MATLAB solves ODE systems of the form A(t,x)*dx = f(t,x) So put all dx terms on the left-hand side, determine the matrix A and...

16일 ago | 0

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Answered
How to plot a continuous graph from distinct points.
x=[1 3 5 6]; y=10*ones(size(x)); plot(x,y,'o')

21일 ago | 0

Answered
Matlab code for boundary condition
So you mean at x=0, you have y = 0 and dy/dx + dz/dx at x=infinity, you have y=1 and z = b and at t = 0, you have y = 1, z...

21일 ago | 0

Answered
How to find the X-coordinate of the plot knowing the Y-value?
[~,index] = max(max0); frequency_value = f(index)

21일 ago | 0

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Answered
pdepe solver boundary condition setup for discrete measured heat flux data
By setting pl = 0.0; ql = 1.0; qr = Area of the side face of the slab; pr = q(t); in the function where you define the boun...

21일 ago | 0

Answered
How to determine whether point lies within pyramid volume
Another program for your issue: https://de.mathworks.com/matlabcentral/fileexchange/10226-inhull

21일 ago | 0

Answered
Complex values computed by fit.m function (Curve fitting Tool)
Since your fitting problem is linear in the coefficients a1,a2,a3,..., this is all you need to get the best fit parameters: A =...

21일 ago | 0

Answered
Numerical integration of a function containing symbolic characters
syms A B x f = x^2*(A*x+B); result = int(f,x,0,1)

22일 ago | 0

Answered
How do I fit a function to data using LSQNONLIN or LSQCURVEFIT?
function main tempodados = [ 0.0000755000 0.0000790000 0.0000825000 0.0000860000 0.0000895000 0.0000930000 ...

22일 ago | 0

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