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Torsten


2,476 total contributions since 2013

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Answered
Creating new matrix from the second column of other matrices
new_matrix = [PIV_1(:,2),PIV_2(:,2),...,PIV_10918(:,2)] Quite much to write ... You should have worked with one 10918x1000x4 ...

14 hours ago | 0

Answered
Generate Independent Identically and Lognormally Distributed Random Variables
Note that mu and sigma you supply for "lognrnd" are not mean and standard deviation of the underlying lognormal distribution, bu...

16 hours ago | 0

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Answered
Why do I get the error “Dimensions of arrays being concatenated are not consistent.”?
T = [ cos(d), -sin(d)*cos(b), sin(d)*sin(b), a*cos(d); sin(d), cos(d)*cos(b), -cos(d)*sin(b), a*sin(d); 0, sin(b),...

3 days ago | 0

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Answered
Generating random variable from certain standard deviation and mean
n = 100; x = 0.3*randn(n,1) generates 100 normally distributed random numbers with mean 0 and standard deviation 0.3.

3 days ago | 1

Answered
How to compute numerical gradient of an unknown function in matlab Simulink?
The i'th component gi of the gradient vector g is approximately given by gi = (f(x1,...,xi+h,...,x10)-f(x1,...,xi,...,x10))/h ...

4 days ago | 0

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...

6 days ago | 3

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

6 days 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...

7 days 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...

7 days ago | 1

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

7 days 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)+...

8 days 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...

11 days 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...

11 days 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

11 days 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

11 days ago | 0

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

11 days 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,...

12 days 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...

14 days 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...

15 days 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...

18 days 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...

18 days 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 ...

18 days 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)

19 days 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.

20 days 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; ...

20 days 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...

21 days 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')

25 days 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...

26 days ago | 0

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

26 days ago | 0

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