Community Profile # Torsten

Last seen: Today Active since 2013

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How to perform linear curve fitting based on distance from line instead of residuals
The residuals are the sum of the vertical distances of the points from the line. If you want to consider the orthogonal distanc...

alrededor de 3 horas ago | 0

PERIMETER OF A 3D POLYGON WHICH DOES NOT LIE IN THE X-Y PLANE
The code should apply to your case: x = 3*cos(0:pi/20:2*pi); y = 3*sin(0:pi/20:2*pi); fn = cscvn([x;y]); % Compute enclosed ...

alrededor de 10 horas ago | 0

Initial Conditions not Generating on Graph
You plot "hs" for different values of "nd". So the initial condition for hs is always the same, namely 225 mm. I don't underst...

alrededor de 10 horas ago | 0

Nonlinear regression using lsqcurvefit
F = @(x,f) x(1)/2 * sin(x(2)*pi/2)./(cosh(x(2)*log(2*pi*f*x(3)))+cos(x(2)*pi/2)); instead of F = @(x,f)(x(1)./2)*(sin(x(2).*pi...

1 día ago | 0

Problem with "if" command
Should be if PBtime_nb>PBtime_b instead of if PBtime_b>PBtime_nb;

1 día ago | 1

Minimize distance between curves
Differentiating with respect to a, setting the derivative to 0 and solving for "a" gives a = sum_i (f_i*g_i) / sum_i (f_i^2) I...

1 día ago | 0

How to make 2D matrix from 3D matrix to solve 2D nonlinear system?
The matrix you have to create and work with is a (sparse) matrix of size (125000 x 125000). The 3d matrix above (whatever it ma...

1 día ago | 1

Use pdepe to solve an ode
So your equation is not a PDE, but a simple ODE. Either you try to artificially set du/dx = 0 at both ends and see whether the...

5 días ago | 0

Projected curve lengths (XY,XZ,YZ) of 3D arcs
Then just set the coordinate of the plane you project on to 0 and calculate the arc length of the resulting projected curve. An...

5 días ago | 0

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Solving a system of PDE using pdepe
The error is solved, but I think the boundary conditions at the right end can't be set within pdepe. The condition set at the m...

5 días ago | 1

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optimization toolbox with fmincon
If you want to admit x,y and z to be complex-valued, you also have to change your objective function to be real-valued for compl...

6 días ago | 0

How do I find the index of the first element equal to 0 for each row of a matrix in a fast way
[~,idx] = max(M==0,[],2) or idx = arrayfun(@(k)find(M(k,:)==0,1),1:size(M,1))

6 días ago | 0

Spline coordinates from spap2
x = -2:.2:2; y=-1:.25:1; [xx, yy] = ndgrid(x,y); z = exp(-(xx.^2+yy.^2)); sp = spap2({augknt([-2:2],3),2},[3 4],{x,y},z)...

6 días ago | 0

How can the lqr function in matlab be modified so that the 2*x'Nu term in the cost function J be replaced with a scalar value?
I wonder why the integral should be finite if you replace 2*x'*N*u by a fixed scalar value. This scalar value must definitely be...

6 días ago | 0

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solve quadratic equation with matrix input variable
syms P N =2000:-50:50; guess = 2; for i=1:numel(N) n = N(i); eqn=((((1.3+(((17.5).*P)./(P+n./20))).^2)+((0.036.*P)....

6 días ago | 0

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estimation of probability density function
help ksdensity

6 días ago | 0

Function value and YDATA sizes are not equal using lsqcurvefit
The integrator was not able to integrate your system of differential equations. So there was no or only an incomplete solution r...

6 días ago | 0

Solving system of 3 non-linear equation with dynamic equality output
syms x1 x2 x3 t A eqns = [ x1 == t*(10*abs((18*x2)/125 - (24*x1)/125 + 111/50)^2*sign((18*x2)/125 - (24*x1)/125 + 111/50) ...

7 días ago | 0

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Error in function interp1: Sample points must be unique.
You can use unique() to get rid of duplicate sample points. It will also sort them.

7 días ago | 0

Solving a System Consisting of PDEs & ODEs using Method of lines
What's wrong with the results ? The fact that Ca becomes negative ? L = 5; % length of reactor v = linspace(0,L,100).'; % di...

7 días ago | 0

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Error using integral; First input argument must be a function handle.
function z= continum(var,energy) z = integral(@(x)cont(var,x),2.39,inf); end

7 días ago | 0

Summing anonymous functions in a for loop: adding penalty terms for optimization
basefun returns a vector of size (8x1) . Now to each component of this vector you add the sum of the following scalar values la...

7 días ago | 0

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Does MATLAB have a feature to show step-by-step solution?
m = 5; B0 = 1; B = fsolve(@(B)fun(B,m),B0) fun(B,m) function res = fun(B,m) B sum1 = 0.0; sum2 = 0.0; for j=0:m-1 ...

7 días ago | 0

Need help to program the hypergeom function
https://de.mathworks.com/help/symbolic/hypergeom.html

7 días ago | 0

Create random numbers inside a specific plane in xy plane
rng("default") x = [2;8]; y = [1;2]; R = rand(2,400) S = [x(1);y(1)]+[[x(2)-x(1);0],[0;y(2)-y(1)]]*R

8 días ago | 0

How do i write CO2 emission constraint?
Every M_CO2^t will be a solution variable x(i) in your optimization. So setting the constraints -(x(i)-x(i-1)) <= 0 for i <=...

8 días ago | 0

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Finding the coordinates of a point given the gradient, distance and one set of coordinates
m = 0.4; x1 = 10; y1 = 4; s = 15; z = [x1 y1] + s/sqrt(1+m^2)*[1 m]; x2 = z(1) y2 = z(2)

8 días ago | 0

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Model of two differential equations of RLC circuit (Simulink)
Solve the system of differential equations dI1/dt = i1, I1(0) = 0 dI3/dt = i3, I3(0) = 0 L*di1/dt = U - R*i1 - 1/c * I1 - 1/c...

9 días ago | 0