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Torsten


Last seen: Today Active since 2013

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Answered
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 ...

22 hours ago | 0

Answered
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...

22 hours ago | 0

Answered
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....

23 hours ago | 0

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Answered
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...

1 day ago | 0

Answered
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(...

1 day ago | 0

Answered
Need help with homework (simple backwards interpolation)
Specify the extrapolation value in interp2.

2 days ago | 0

Answered
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...

2 days ago | 0

Answered
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...

3 days ago | 0

Answered
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...

3 days ago | 0

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Answered
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...

3 days ago | 0

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Answered
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...

4 days ago | 1

Answered
How to get certain value from matrix multiplication?
https://de.mathworks.com/help/comm/ref/gflineq.html

5 days ago | 0

Answered
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*(...

5 days ago | 0

Answered
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 -...

5 days ago | 1

Answered
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...

5 days ago | 0

Answered
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

5 days ago | 0

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Answered
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...

7 days ago | 1

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Answered
Create random matrix (MATLAB)
Use intlinprog for the program min: sum_{i=1}^{numRows} (e1_i+ + e1_i-) + sum_{j=1}^{numCols} (e2_j+ + e2_j-) under the constr...

7 days ago | 0

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Answered
How I can determine the intersection point of two projectile
Set x1 = x2 and y1 = y2 for an intersection point of the two curves. You'll get xinter= (tan(theta2)-tan(theta1))/(g/(2*(v2*co...

8 days ago | 1

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Answered
how to write this in matlab?
result = sin(pi/2)^2 + tan(3*pi^2)

8 days ago | 0

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Answered
How to find a proper algorithm to solve this optimal control problem?
This should give you a start: %Optimal advertising expenditure in monopoly %% Constants p = 100; a = 0; b = 0.07; c = 0.04...

8 days ago | 0

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Answered
Need solution for this error
First get a fid to open your file: fid = fopen( filename )

8 days ago | 0

Answered
Solving coupled Partial Differential Equations using method of Lines
For the pdepe version, better use function [pl,ql,pr,qr] = pdex2bc(zl,Cl,zr,Cr,t) Cin =[1 1 0 0]; % inital concentrations ...

9 days ago | 2

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Answered
Derivative of a function with constants
syms x a b c f = x*e^x*(a*x^2+b*x+c); df = diff(f,x)

9 days ago | 0

Answered
I want to find the five unknown of a system of five nonlinear equations. Thank you !
function main x0 = rand(5,1); x = fsolve(@fun,x0) end function res = fun(x) k1 = x(1); k2 = x(2); k3 = x(3); k4 = x(4); ...

10 days ago | 0

Answered
Errors while trying to setup equation for root finding.
function main a0 = 1; a = fzero(@fun,a0) end function res = fun(a) z_pdo = ...; k_pdo = ...; z_water = ...; ...

10 days ago | 0

Answered
Why my graph is not the same as paper!!
clear all rlength =10; %meter dx = 0.0001; Numdata = rlength/dx; %constant value Cpf=0.707; %kcal/kg.K Cpg=0.719; %kcal/kg...

10 days ago | 1

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Answered
If I have 512 matrices (entries of each matrix is looping modulo 2), how the multiplication syntax for those 512*512 matrices ?
m = 9; justRows = dec2bin(0:2^m-1)-'0'; for i = 1:size(justRows,1) A = reshape(justRows(i,:),[3,3]); M{i} = A; end

11 days ago | 0

Answered
solve four variables 1111
function main A = input('1,2;3,5'); B = input('8,-1;3,7'); C = input('2,6;8,4'); a1=A(1,1); a2=A(1,2); a3=A...

11 days ago | 1

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