Torsten
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Contribute at least one answer each month for 36 consecutive months
Awarded to Torsten on 12 Oct 2019
Answer 3 questions that were unanswered for more than 30 days
Awarded to Torsten on 20 Jul 2017
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Content Feed
Error solving bvp4c - Singular jacobian
Try this code following John's suggestion: %Constants hb = 6.626e-34/(2*pi); m = 9*1.660538921e-27; w0 = 2e6*2*pi; Cc = (1....
alrededor de 3 horas ago | 0
| accepted
Function inside the function
r=@(s,z) sqrt((s+s0).^2+(z+z0).^2); Ds=@(s,z)(c0x+A1x.*erf((r(s,z)+a1x)./b1x)+A2x.*erf((r(s,z)+a2x)./b2x)+A3x.*erf((r(s,z)+a3x)...
alrededor de 4 horas ago | 0
| accepted
Evaluating a function with Matlab
Then you have to program it as t = 10; f = sign(t-16.82).*abs((t-16.82)/5.604).^1.576 An expression x^a for x<0 is comple...
alrededor de 5 horas ago | 1
How to Solve matrix symbolically?
It can solve for scalars - and since both expressions are linear in the matrices, the scalar and the matrix solution coincide. ...
alrededor de 6 horas ago | 0
For loop to take the average of previous 10 elements and next 10 elements in an array in each step
https://de.mathworks.com/help/matlab/ref/movmean.html
alrededor de 18 horas ago | 0
| accepted
How do I count how many times in a row a value occurs?
A = [1 2 4 3 1 1 1 1]; Au = unique(A); count = arrayfun(@(i)numel(find(A==Au(i))),1:numel(Au)) output = [Au;count].' Your qu...
alrededor de 22 horas ago | 0
Zeros from Trapz integration
Maybe you mean something like L = 2; %thickness [m] TL = 300; %surface T [K] T0x0 = 340;%T0(x=0) T0x = @(x) -182.22.*x.^3 + ...
alrededor de 22 horas ago | 0
Reveresing the order of columns in an array
A = [1 2; 3 4; 5 6; 7 8; 9 10; 11 12]; perm = [1 6 5 4 3 2]; A = A(perm,:)
alrededor de 23 horas ago | 0
How to code a certain part of this equation?
for i = 1:m-1 xmhalf = x(i); xphalf = x(i+1); B_agg(i) = 0.0; for k=1:m for j=k:m if v...
alrededor de 23 horas ago | 0
| accepted
Swaping two columns randomly picked
A = rand(25,5); i = randsample(5,2); v = A(:,i(1)); A(:,i(1)) = A(:,i(2)); A(:,i(2)) = v; or simply A = rand(25,5); i =...
1 día ago | 0
| accepted
Imposing Constraint in FMINCON optimization problem.
Aeq = [zeros(1,N_plies),ones(1,N_plies)]; beq = 1.0;
1 día ago | 2
How to fit power law distribution on data set?
plfit is not an official matlab code. You can download it here: https://github.com/jblocher/matlab-network-utilities/blob/mast...
1 día ago | 0
Raising a scalar to each element in a matrix
expm is incorrect, use exp. And you shouldn't divide by 0 - not for X and not for Y. x = linspace(1,50); y = linspace(1,50); ...
1 día ago | 0
Sinus plus straight lines plot
f = @(x) 2*sin((x+2)*pi/2).*(x>=-2).*(x<-1) + (-2*x).*(x>=-1).*(x<=0); x=-2:0.001:0; plot(x,f(x)) Can you add the next two cy...
1 día ago | 0
| accepted
Setting Initial Conditions for Genetic Algorithm
Here is a list of options (also for initial conditions) you can set for ga: https://de.mathworks.com/help/gads/ga.html#mw_4a8bf...
1 día ago | 0
possitive solution for set of three nonlinear eqations where t_1 t_2 and pi_2 are varaibles
Solve the first equation for t_i2. Solve the second equation for P_i2 and insert the expression for t_i2 from the first equatio...
1 día ago | 0
how to create an arc path from 3 points(x, y, z) in plane?
Determine the center of the circle: https://math.stackexchange.com/questions/1076177/3d-coordinates-of-circle-center-given-thre...
1 día ago | 0
| accepted
Ho to perform Monte Carlo Simulation with a factor and a vector.
data_TSS=readtable('turb_danuube_15min.csv'); % data TSS & time TSS=data_TSS(1:1:353665,2); time=data_TSS(1:1:353665,1); %% T...
2 días ago | 0
| accepted
A simple error minimization (optimization) problem
A = [C1,C2,C3]; b = L1+L2+L3; C = A\b; C1 = C(1) C2 = C(2) C3 = C(3)
2 días ago | 0
| accepted
while loop to count partail sum of series
sum_{i=1}^{i=N} 1/(i*(i+1)) = 1 - 1/(N+1) No need for such a difficult while construction with precision estimate.
2 días ago | 0
How to get energy using power summation equation in MATLAB?
t = [0 t]; E = sum(P.*diff(t))
2 días ago | 0
| accepted
Solve system of differential equations
x01=-5;y01=-7; x0=[x01,y01]'; beta=25; syms x1 y1 t x11=[x1,y1]'; c1=(1/2)*(x1-i*sin(t))^2+(3/2)*(y1-i*cos(t))^2; row=100*...
2 días ago | 0
Loop to check if 2 conditions are true for values 1:n, (1:n)+1, (1:n)+2, etc. in a vector and save ID
for i=1:365-7+1 period = rainfall(i:i+6); sum_period = sum(period); n = numel(find(period>0)); if sum_period...
2 días ago | 0
| accepted
Use ode45 when I have a constant that varies over time.
n=10; xmin_in = 15; % Minimum inlet temperature xmax_in = 16; % Maximum inlet temperature T_in = xmin_in+ra...
2 días ago | 0
| accepted
Determine y for a function with a symbolic variable x
syms x F(x) = x.^2; F(0)
2 días ago | 0
Rotate the coordinate system to align an existing plane with Y'Z' plane
https://stackoverflow.com/questions/9423621/3d-rotations-of-a-plane But are you sure that the parabola in the YZ plane is not a...
3 días ago | 0
How to solve a system of differential equations using ode45 and vary the magnetic field and plot the solutions as a function of this field?
b=[0:0.1:10]; d0=0.2 wb=1 wd=wb-d0 wl=wb db=0.18 dd=0.05 a=0.02 Ua=0.15 Ub=0.02 g1= 0.001 g2=g1 g3= 0.0001 g4=g3 %...
3 días ago | 0
Problems with declaring the variable right
xg= 7*2*5*1*6*3; xh= 3/10; F1=3; F2=100; T= 1/500; fun = @(k1,i) xg*sin(2*pi*F1*(k1-i)*T); fun(14,0:14)
3 días ago | 0
Spectral factorization of polynomial x(s)
Let a(s)*a(-s)+b(s)*b(-s) = p0 + p1*s + ... + p2n*s^(2*n) Determine the roots of a(s)*a(-s) + b(s)*b(-s) The 2*n roots ap...
3 días ago | 0
| accepted
Correctly evaluate exponential function for limit values
function result = f(x,g,h,N) result = N^2*ones(size(x)); K = g(x).*h(x) ~= 0; if (any (K(:))) result(K) = your exp...
3 días ago | 0
