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Torsten


2,514 total contributions since 2013

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Answered
simple integration calculation to find the area ?
value_integral = trapz(T,V)

3 hours ago | 0

Answered
Matrix dimension do not agree when solving a singular bvp using bvp4c
Your boundary conditions can not be handled by bvp4c: You prescribe two times that y(2)=0 at the left boundary point and you gi...

4 hours ago | 0

Answered
Trying to solve a definite integral but wont give numerical solution
Q=150; k=1.49; n=0.02; So=0.0048; b=3; g=32.2; x1=0; y1=3; %x2=200; h=20; x2=200; f_xy=@(y)(So-((Q*n)./(k*b*(y.^(5/3)...

4 hours ago | 1

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Answered
How to translate an ArgMin with a summation inside?
dt = (t-s*x).'*(t-s*x); where x is a scalar and t and s are column vectors of the same length.

2 days ago | 0

Answered
numerical solution the given equation to determine the zero value of k
solvk = @(k) 1+cos(k*l).*cosh(k*l) + (M/Mt).*k*l.*(cos(k*l).*sinh(k*l)-sin(k*l).*cosh(k*l)); val = fzero(solvk,0.1)

3 days ago | 0

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Answered
Skipping the for loop if condition is meet
idx = a~=b; c(idx) = a(idx)-b(idx);

3 days ago | 0

Answered
Solve one variable equation in Interval
x = (Tem.'*Tem)/(Tem.'*Tshaft) where Tem, Tshaft are column vectors of the same length.

4 days ago | 0

Answered
Need help to put condition in my optimization function
T0= fsolve(@(tw0) (exp(-s2.^2./2).*exp(tw0.*s2).*(1-qfunc((t1-s1-rho.*tw0+rho.*s2)./sqrt(1-rho.^2))))-P*(1-qfunc((t1-rho.*tw0)./...

4 days ago | 0

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Answered
How can I solve a complicated symbolic integral
There are integrals with no analytical antiderivative - yours seems to be one of them. In other words: assign values to r and M...

4 days ago | 0

Answered
Fit differential equation to a curve
Our standard reference: https://de.mathworks.com/matlabcentral/answers/43439-monod-kinetics-and-curve-fitting

4 days ago | 0

Answered
MATLAB CODE TO FIND LOCAL EXTREMA OF A FUNCTION
syms x y f = x^2 + y^3 - 3*x*y; fx = diff(f,x); fy = diff(f,y); eqns = [ fx == 0, fy == 0]; vars = [x y]; [solx, soly] = s...

10 days ago | 0

Answered
Solving Ax=b with both unknowns in A and b
Now if W_{0}^{m} and W_{N+1}^{m} are 0 (I think you meant W_{0}^{m} instead of W_{N}^{m}), you have a system of N equations in W...

10 days ago | 1

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Answered
Fit of numerical expression
Use an anonymous function to define your model equation. For examples, see https://de.mathworks.com/help/curvefit/fittype.html...

10 days ago | 0

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Answered
Matlab coder alternative to lsqlin
https://www.mat.univie.ac.at/~neum/software/minq/ http://sigpromu.org/quadprog/

10 days ago | 0

Answered
how to integrate this function?
T = ...; dt = T/(numel(B)-1); t = linspace(dt,T-dt,numel(B)-1); dB = diff(B); value = trapz(t,dB.^2)

10 days ago | 1

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Answered
Error using / Matrix dimensions must agree
fp = (1./(x + h) - 2*(1/x) + 1./(x - h)) ./h.^2;

10 days ago | 0

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Answered
What's the best way to check if a system of one equation and one inequality has any solution?
Use "fmincon" with an arbitrary objective function (e.g. 0).

14 days ago | 1

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Answered
How to write and solve this pde system
If your system is in one spatial dimension, use "pdepe". Examples on how to set up your problem are given here: https://de.mat...

14 days ago | 0

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Answered
How to Solve sets of equations with constants
Multiply the first equation with 2 and subtract the second. d cancels out and you can solve for c. Multiply the first equation ...

15 days ago | 1

Answered
how to calculate complex integration along a closed curve.
I = 1/(2*pi*1I) * integral_{t=0}^{t=T} f(z(t))*z'(t) dt where z(t) is a parametrization of gamma. The last integral can numeri...

15 days ago | 0

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Answered
How to solve a system of two PDEs encountered in Mathematical Biology
This should help you starting: https://de.mathworks.com/matlabcentral/answers/440015-first-order-partial-differential-equations...

15 days ago | 0

Answered
Solving Finite Difference Method Using ODE15s
%OTHER FILE THAT CALLS FUNCTION (Excluding all the constants) T0 = ones(n,1)*298; %matrix of initial condition for T, rows = nu...

15 days ago | 1

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Answered
Solving Finite Difference Method Using ODE15s
You can either solve for T1,...,T_(n-1) (and the two extra variables) using ODE15S and calculate T(n) internally each time the...

16 days ago | 0

Answered
Piecewise function, ranges are variable
EPS = linspace(-0.5,0.5); L0 = arrayfun(@(C)pwlaborsupply0(C, 0.1,0.25),EPS); plot(EPS,L0)

17 days ago | 0

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Answered
ODE for 2 variables
function main p = [1 2 3 4 5 6 7]; A = 20; x0 = 2; y0 = 5; z0 = 27; u0 = -34; a0 = [x0; x0*y0; x0*z0; x0*u0]; ts...

17 days ago | 1

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Answered
Non linear function for an optimal control problem
https://tomopt.com/docs/propt/tomlab_propt015.php

17 days ago | 0

Answered
could anyone help me to solve the issue.
idx = B==0; B(idx) = A(idx)

17 days ago | 0

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Answered
A simple matrix question
fliplr(A)

18 days ago | 0

Answered
How to obtain the numerical integration of a set of different values of prameter which appear in Xmin
M=arrayfun(@(D) integral3(@(k,x,y) TuuV(k,x,y,D),kc.*sqrt(mu+delta-D),ku,0,pi/2,0,pi/4,'reltol',1e-4),v);

18 days ago | 1

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Answered
how to increase a column with every for loop
column = x.*y; iter = 0; while iter < 6 [calculate new x-vector]; column = [column ; x.*y]; iter = iter + 1; end

21 days ago | 0

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