Community Profile # Torsten

Last seen: Today Active since 2013

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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

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

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

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

estimation of probability density function
help ksdensity

alrededor de 10 horas 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...

alrededor de 11 horas 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) ...

alrededor de 17 horas ago | 0

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

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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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

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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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

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

1 día 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

1 día 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 <=...

2 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)

3 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...

3 días ago | 0

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

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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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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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

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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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

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

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

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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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

[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