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Torsten


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Answered
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

Answered
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

Answered
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

Answered
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

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

1 día ago | 1

Answered
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

Answered
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

Answered
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

Answered
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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Answered
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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Answered
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

Answered
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

Answered
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

Answered
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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Answered
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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Answered
estimation of probability density function
help ksdensity

6 días ago | 0

Answered
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

Answered
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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Answered
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

Answered
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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Answered
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

Answered
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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Answered
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

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

7 días ago | 0

Answered
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

Answered
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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Answered
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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Answered
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

Answered
Curve fit app displays wrong curve
pc = [ 1.8513e+03 3.6393e+03 3.7146e+03 3.7914e+03 3.8699e+03 3.9500e+03 4.0317e+03 4.1151e...

9 días ago | 0

Answered
how to set a range of data instead of percentile?
https://de.mathworks.com/help/matlab/ref/isoutlier.html

9 días ago | 0

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