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Torsten


Last seen: Today Active since 2013

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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))

alrededor de 5 horas 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)...

alrededor de 8 horas 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...

alrededor de 9 horas ago | 0

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)....

alrededor de 10 horas ago | 0

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estimation of probability density function
help ksdensity

alrededor de 10 horas 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...

alrededor de 11 horas 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) ...

alrededor de 17 horas ago | 0

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.

alrededor de 17 horas 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...

1 día 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

1 día 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...

1 día 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 ...

1 día ago | 0

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

1 día 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

1 día 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 <=...

2 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)

3 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...

3 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...

3 días ago | 0

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

4 días ago | 0

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Answered
unable to use solve or fsolve for linear system
Seems your equations are not independent. syms R1 R2 R3 R4 COM = [-6,0,10]; r1 = [-54.2,-27.5,-16.4]; r2 = [-54.2,27.5,-16.4...

4 días ago | 0

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Answered
Implementing implicit method for system of ODEs
n = 50; % number of time steps t0 = 0; % initial time T = 2*pi; % final time dt = (T-t0)/n; % size of timestep y0 = [1;0]; %...

4 días ago | 0

Answered
reflection of a curve with respect to a plane
x = -1:0.2:10; y = x.^2 + 2; z = zeros(size(x)); P = [2 2 2]; V = [0 0 1]; d = (P.' - [x;y;z]).' * V.'; Ps = [x;y;z] + 2*V...

4 días ago | 0

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Answered
where is the error in my code?
V1 = @(r,w) -acosh(10*(w/(1600*r + 21))^(1/2))/20000000000; V2 = @(r,w) acosh(10*(w/(1600*r + 21))^(1/2))/20000000000; % Defin...

5 días ago | 0

Answered
I have three coupled differential equation and need help to solve them
You have a linear system of equations in dx/dt, dy/dt and dz/dt. Solve it for these variables. Then you can write your system e...

5 días ago | 0

Answered
Unable to convert the following expression into double array
clc; clear all; close all; al = 0.5; n = 5; sig2_fsnrn = 1; sig2_ksln = 1; sig2_glnrn = 10; sig2_e_fsnrn = 0; sig2...

6 días ago | 0

Answered
Can't get the solution on this nonlinear system of equations using vpasolve
For that your two equations can have a solution, one can show that abs((PX^2+PY^2-l1^2-L2^2)/(2*l1*L2)) must be <= 1. This i...

6 días ago | 0

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Answered
How to load intermediate variable into workspace while using ode45 ?
tspan = 1:200; x0 = zeros(38,1); [t,x] = ode45(@system, tspan,x0); ts=40; ssActive = [1,2,3,4,1,3,4,2,4,3,3,4,3,3,1,2,3,4,1,...

7 días ago | 0

Answered
[f,x]=ecdf(y) definationf of x
https://de.mathworks.com/help/stats/ecdf.html There are six literature reference at the bottom of the page. Usually, the minim...

8 días ago | 0

Answered
trying to use the fmincon function
Works for me after changing "fun" in "@fun": % script calling fmincon start clc clear all x0=[-1...

8 días ago | 0

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Answered
How to generate all possible vectors where each element can take one of two values
Generate all possible combinations of 0 and 1: m = 3; justRows = dec2bin(0:2^m-1)-'0' Now replace the 0's by a(i) and the 1 b...

8 días ago | 1

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