Statistics
0 Questions
2.749 Answers
RANK
27
of 250.385
REPUTATION
6.602
CONTRIBUTIONS
0 Questions
2.749 Answers
ANSWER ACCEPTANCE
0.00%
VOTES RECEIVED
763
RANK
of 17.392
REPUTATION
N/A
AVERAGE RATING
0.00
CONTRIBUTIONS
0 Files
DOWNLOADS
0
ALL TIME DOWNLOADS
0
RANK
of 104.068
CONTRIBUTIONS
0 Problems
0 Solutions
SCORE
0
NUMBER OF BADGES
0
CONTRIBUTIONS
0 Posts
CONTRIBUTIONS
0 Public Channels
AVERAGE RATING
CONTRIBUTIONS
0 Highlights
AVERAGE NO. OF LIKES
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
100 of your answers have been accepted
Awarded to Torsten on 20 Jul 2017
Provide your first answer ever to someone else's question
Awarded to Torsten on 20 Jul 2017
Content Feed
Solving equation without syms
For the first equation: Build the polynomial of degree 3 in V with pencil and paper, give numerical values to S,V0,C and P and ...
ongeveer 8 uur ago | 0
| accepted
Determining the steady-state concentrations using your numerical solutions.
Set dadt,dbdt,dcdt and dddt to 0 and solve the algebraic system in a,b,c,d using fsolve, e.g.
1 dag ago | 0
Make a 3D plot over a circle
r=linspace(75,365,25); phi=linspace(0,2*pi,36); [R,PHI]=meshgrid(r,phi); X=R.*cos(PHI); Y=R.*sin(PHI); Z=interp1(rm,velm,sq...
1 dag ago | 0
Replace powers with a sequence
syms x c = sym2poly(expand((x-1)^3)); e = sym('e',[3,1]); c_times_e = c*e
1 dag ago | 0
computing a interpolating polynomial for some function
x = linspace(-1,1,20); yfunc = @(x) 1./(1+16*x.^2); y = yfunc(x); ... or x=linspace(-1,1,20); y=1./(1+16*x.^2); ...
1 dag ago | 0
| accepted
Doubt about finding the nearest values between array and a matrix
for i=1:size(Array,2) [r{i},c{i}] = find(abs(Matrix-Array(i))==min(abs(Matrix(:)-Array(i)))); end
2 dagen ago | 1
| accepted
Finding the last value of a difference equation
Then iterate 2-times more starting with n=1 instead of n=-1. function res = my_matlab_function(A,N) y = zeros(N+1,1) y(1)...
4 dagen ago | 0
Optimization with time-dependent constraint
Use "linprog" and define the 24 equalities SOC_i - (SOC_i-1 + c_i - d_i) = 0 (i=1,...24) in the matrix Aeq with SOC_1,...,SO...
4 dagen ago | 0
Why does 40-variable optimization array exceed maximum array size preference?
It's hard to see what MATLAB does when using the problem-based approach. I prefer the solver-based approach because it is much ...
4 dagen ago | 0
| accepted
Solving system of four second order ODEs
4 second-order ODEs need 8 initial conditions, not 4.
5 dagen ago | 1
| accepted
5x5 matrix (P) with all 25 values unknown. I have two known matrices of size 5x5 each (A1 and A2) and the relation P*A1*inv(P)=A2. How do I obtain P?
I think you could also get such P by solving the linear optimization problem min: sum_ij (eij+ + eij-) under the constraints ...
5 dagen ago | 0
eig return complex values
Use E = eig(A,C) instead of E = eig(inv(C)*A) or E = eig(C\A)
5 dagen ago | 0
| accepted
Minimize norm of the complex number array with subtraction of a variable
for ii = 1:N rng default rdc0 = 1+1i; % You add one complex value to try to minimize the resulting sum of squares ...
6 dagen ago | 0
| accepted
How to solve NaN when using trapz?
[num data raw] = xlsread('Flowratevel.xlsx'); for i=1:size(num,2) Num{i} = num(:,i)(~isnan(num(:,i))); end A1 = pi*Num{1...
6 dagen ago | 0
| accepted
How to solve 3 TDOA equations with 3 variables x,y,z
Code for symbolic solution: syms x y z x1 = 0.60; y1 = 0.00; z1 = 0.70; x2 = 0.20; y2 = 1.30; z2 = 0.70; x3 = 0.80; y3 = 1....
6 dagen ago | 0
| accepted
How to solve 3 TDOA equations with 3 variables x,y,z
If there are no specialized methods to solve the TDOA equations (did you take a look into the literature ?), I suggest trying s...
7 dagen ago | 0
how to solve system of 2 differential equation with boundaries
Rewrite your equations as a system of first-order ODEs dy(1) = y(2); dy(2) = 9*phi_A^2*y(1)/(1+y(1)+y(2)); dy(3) = y(4); dy(...
7 dagen ago | 0
Need help with homework (simple backwards interpolation)
Specify the extrapolation value in interp2.
7 dagen ago | 0
Empty Sym when using vpasolve-operator.
e = [0.05:0.05:1]; syms tp for i=1:numel(e) eqn = 900-e(i)*5.67*10^(-8)*tp^4-20*(tp-293)==0; S{i} = vpasolve(eqn,tp); e...
8 dagen ago | 0
How to solve for unknown function in integral equation?
One (maybe naive) approach: Choose 0=n(1)<n(2)< ... <n(K)< oo and z(1),...,z(K) Then use linsolve to solve the linear sy...
8 dagen ago | 0
Unable to plot iterated function system
function Modern_Art A{1} = [1;2]; n = 100; r = rand(100,1); for i=1:100 if r(i)<0.01 A{i+1} = [0 0;0 0...
8 dagen ago | 0
| accepted
I have an error where it says unrecognized function or variable x when using fsolve.
function main W = 1248.5*9.81; S = 17.1; list_aoa = linspace(0.0438914335842468,0.316137577406202,100); h_V_ao...
8 dagen ago | 0
| accepted
How to obtain the value of the matrix X in equation AXA' = B?
If you multiply out A*X*A' for a matrix of unknowns X=(x_ij) and compare the elements with those of the matrix B, you get an (in...
9 dagen ago | 1
How to get certain value from matrix multiplication?
https://de.mathworks.com/help/comm/ref/gflineq.html
10 dagen ago | 0
find the minimum objective for a given ode as boundary value problem
Vector of unknowns for fmincon: (y1,y2,y3,y4)=(a,b,c,tend) Objective for fmincon: f(a,b,c,tend) = integral_{t=0}^{tend} c*(...
10 dagen ago | 0
Can one help me to find Matlab coding to convert the given matrix to a symmetric matrix by rearranging rows?
Use intlinprog or bintprog to solve min: sum_{i=1}^{n} sum_{j=1}^{n} (e_ij+) + (e_ij-) under the constraints E+ - E- - (P*A -...
10 dagen ago | 1
Index exceeds the number of array elements. Index must not exceed 1.
z(1)=-314; v(1)=0; h=0.1; tson=10; t=0:h:tson; L=1.5; vi=0.000001; n = 100; for i=1:n Re(i)=abs(v(i))*L/vi; Cf...
11 dagen ago | 0
PdeModeler App Generic System of Equations are different from those in the Manual
https://de.mathworks.com/help/pde/ug/pde.pdemodel.specifycoefficients.html#bu7pwf5
11 dagen ago | 0
| accepted
Couette flow between two plate
Underlying equation is d^2u/dy^2 = -G/mu with G = -dp/dx = const https://en.wikipedia.org/wiki/Couette_flow function main...
12 dagen ago | 1
| accepted
