# Torsten

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**Content Feed**

Avoid evaluation in vectorised conditional expressions

If your right-hand side contains expressions with x, you must replace x by x(idx1) resp. x(idx2).

ongeveer 3 uur ago | 1

| accepted

How to reorientate the orientation of a mobile robot to a specific angle.

You mean change orientation_old = [2*pi*rand(1),0] to orientation_new = fliplr(orientation_old) ?

ongeveer 6 uur ago | 0

How to integrate a lognormal pdf

Use "logncdf" with the parameter values from "fitdist" and the input values xi1.

ongeveer 6 uur ago | 1

bvp4c for coupled interface boundary conditions

Read this carefully, and you will know how to set up your problem: https://de.mathworks.com/help/matlab/math/solve-bvp-with-mul...

ongeveer 6 uur ago | 0

How to check whether point is inside high dimensional convex hull?

https://de.mathworks.com/matlabcentral/fileexchange/10226-inhull

ongeveer 7 uur ago | 1

| accepted

Obtaining a matrix of solutions with fsolve

Don't solve for all x values at once. Call "fsolve" in a loop and solve for each pair of combinations for (c1,c2,c3,c4) separa...

ongeveer 8 uur ago | 1

pdepe coupled boundary conditions

pl = pr = 0, ql = qr = 1 for both components u1 and u2. What's the problem ?

ongeveer 8 uur ago | 0

define a function in terms of an integral with variable limits

f1=@(t)3+2*cos(2*pi*t); f2=@(t)4-3*sin(2*pi*t); ff=@(t)-f1(t)-f2(t); gg=@(u,t)integral(ff,u,t); ww = @(u,t)f1(t).*exp(gg(u,t...

ongeveer 18 uur ago | 0

| accepted

How can I improve the efficiency of an equation with double summation

rng("default") M = 100; % Some temporary vectors so that the code can run t = linspace(2,10,10001); y = sqrt(t); x = abs(ra...

ongeveer 19 uur ago | 0

How do I interpolation into a ODE45 function for my trajectory code?

I additionally told ode45 to stop integration at h = 0. clc clear % define the initial conditions for the falling object y...

ongeveer 19 uur ago | 0

| accepted

custom equation fit in curveFitter is not working

pc2 = [ 0 0.0001 0.0011 0.0216 0.2847 0.8708 1.0000]; lam_2 = [ 0 30 55 110 2...

ongeveer 22 uur ago | 1

| accepted

numerical integration inf to inf

Set a=-1+eps; b=1-eps; instead of a=-1; b=1; For comparison: syms x e = 0.01; f = 1/sqrt((1-x^2)+(e/2)*(1-x^4)); valu...

ongeveer 23 uur ago | 0

Bessel Equation VPASolve for the order

nu = 0:0.1:7; B = besselk(nu,3)-5; plot(nu,B) fun = @(nu)besselk(nu,3)-5; nu = fzero(fun,[6 7])

1 dag ago | 1

| accepted

How to plot non-quadratic functions?

I suggest you evaluate the three profit functions for a rectangular region [alpha_min,alpha_max] x [ F_min,F_max] and introduce ...

1 dag ago | 0

| accepted

Problem with undefined function

An alternative without the toolbox: logncdf_user = @(x,mu,sigma) 0.5*(erf((log(x)-mu)/(sqrt(2)*sigma))+1); x=0:0.1:10; hold o...

2 dagen ago | 0

A system of nonlinear equations with three variables

The equations for x and y (eqnx and eqny) are polynomials of degree 3 in x resp. y. They might have several real solutions x an...

2 dagen ago | 0

| accepted

Way to solve AX=XB

dim = 4; X = sym('X',[dim dim]); A = rand(dim); B = A.'; [M, ~] = equationsToMatrix(A*X==X*B) if rank(M) < size(A,1)^2 N...

3 dagen ago | 0

Trouble using lsqnonlin to fit the IV curve of a solar cell

You did not include global V Voc Jsc T k q J in the script part. clc clear global V Voc Jsc T k q J %reads input file ...

4 dagen ago | 0

| accepted

How do I represent this sym function as a written formula

syms s f = vpa(ilaplace(1/((s+7)*(s^3+4*s^2+6*s+5))),4)

4 dagen ago | 0

Invalid use of operator. error, dont know what to change to fix it.

Elementwise operations are .* ./ and .^ .) does not exist. f = (x.^2).*exp(-x)

4 dagen ago | 0

| accepted

I want to check if something algebraically simplifies to 0 when i sub in values

Euler equations of gas dynamics ? Eigenvalues and Eigenvectors of the Jacobian are well-studied. Why reinvent the wheel ? syms...

4 dagen ago | 0

How do I solve a linear optimization problem with a constrained output?

Define the X to be solved for as X = (u,x).Then you can constrain x according to your needs and continue using "linprog".

4 dagen ago | 0

ODE45 - must return a column vector.

B = readtable('t13.xlsx'); t13 = table2array(B); c = readtable('ambient.xlsx'); ambient = table2array(c); d = readtable('sol...

4 dagen ago | 0

| accepted

How to solve optimization problems when the objective function includes a symbolic function

The usual way to deal with this problem is to define Func2Var1 and Func2Var2 as additional optimization variables and to specify...

5 dagen ago | 1

Function with many outputs

X=ga(@cost,numel(X)); function J = cost(X); [Y_1,Y_2] = MyFun(X); J = Y_1.^2+Y_2.^2; end

5 dagen ago | 0

| accepted

Trial and error problem

The results are not convincing, but that's the way to go with three data points. fun1 = @(x)[0.0701-x(1)*exp(x(2)/(293.65-x(3))...

5 dagen ago | 0

Why cant I get a stable Cranck Nicolson discretization?

We use a Dirichet boundary condition so that x=0 for t = 0 and a = 0. And which conditions at a = a_end ? Try "pdepe". If th...

5 dagen ago | 0

Optimising Limits of Chain integrals

fun1 =@(g1) 208.4*exp(-0.02704.*g1)-293.9*exp(-0.1286.*g1); fun2 =@(g2) 108.3*exp(-0.01137.*g2)-622.8*exp(-0.1578.*g2); A = ...

5 dagen ago | 1

| accepted