photo

Torsten


Last seen: Today Attivo dal 2013

Followers: 17   Following: 0

Statistica

  • Most Accepted 2023
  • Most Accepted 2022
  • Explorer
  • Master
  • 36 Month Streak
  • Revival Level 2
  • Knowledgeable Level 5
  • First Answer

Visualizza badge

Feeds

Visto da

Risposto
expressing the complex function
Use syms x t real instead of syms x t Then real(series) and imag(series) will work.

circa 13 ore fa | 0

| accettato

Risposto
beginner integration trouble.
"int" cannot find an analytical antiderivative for f(x). Thus to get the numerical value for the integral, use Area=2*vpainte...

1 giorno fa | 0

| accettato

Risposto
Using erfcinv and array indices are being rejected as not positive or valid, despite all being positive in the vector
As far as I understand, "erfbatp" is an array of numbers. So erfbatp(2*.05/2) = erfbatp(0.05) does not make sense, does it ? V...

2 giorni fa | 0

Risposto
Converting symbolic ODE solution to function ... Warnings
The solution is implicitly given by the equation (a*y+b*y^2/2+c*y^3/3+d*y^4/4)-(a*y0+b*y0^2/2+c*y0^3/3+d*y0^4/4) - integral_{x'...

2 giorni fa | 0

Risposto
convert the above expression into this graph
I'll show you how to solve for theta2 given theta from the equation sin(theta2-theta)+exp(-theta2/(omega*tau))*sin(theta)=0 F...

2 giorni fa | 1

| accettato

Risposto
Trouble using ODE45 for coupled non-linear differential equation
I can't recover the four differential equations you solve from the two equations you included in mathematical form. Your equati...

3 giorni fa | 0

Risposto
How to get the answer from the following code. How can i extract the values from the code?
F = U1.y(5,1)-Nt*U1.yp(5,1) J = -1i*U1.y(6,1) N1 = -U1.y(7,1) N2 = -U1.y(8,1)

4 giorni fa | 0

| accettato

Risposto
Explicit method for Allen-Cahn equation
xstart = -1.0; xend = 1.0; nx = 401; x = linspace(xstart,xend,nx).'; dx = x(2)-x(1); tstart = 0.0; tend = 1.0; nt = 10; ...

4 giorni fa | 0

| accettato

Risposto
How to fill a variable with the results of an if...elseif statement
Use imin = 0; imax = 0; isaddlePts = 0; iinconcl = 0; for ind = 1:9 D=fxx(Xc(ind),Yc(ind))*fyy(Xc(ind),Yc(ind)) - (fx...

4 giorni fa | 0

| accettato

Risposto
Need to rectify error in my matlab code given below
I want to get a plot of dn/dt versus t. syms t mu=2500*(10^-4); %cm^2*V^-1 * s^-1 R = 0.318; eta=377;% ohm N=3.681; %refind...

4 giorni fa | 0

Risposto
Using Runge Kutta to solve second-order differential equations with two degrees of freedom
I don't understand from your code if you want to perform a parameter study for 1000 different values of omega or if you want to ...

5 giorni fa | 0

Risposto
Cannot get fmincon to work
clear close clc format long %% Variables dp = 11.6; taup = 3710e-6; dn = 2; taun = 371e-6; Jl = 50e-3; ni = 9.696e9; ...

6 giorni fa | 1

| accettato

Risposto
I continue to get this error and can't figure out how to fix it, Unable to perform assignment because the size of the left side is 1-by-4 and the size of the right side is 1-b
If you take the derivative of a polynomial, the degree of the resulting polynomial is one less than the degree of the original p...

7 giorni fa | 0

Risposto
coupled differntial equation using ode45
G = 1; Na = 1; xstart = -1; xend = 1; nx = 51; x = linspace(xstart,xend,nx); solinit = bvpinit(x, [0;0;1;0]); sol = bvp...

8 giorni fa | 1

| accettato

Risposto
coupled differntial equation using ode45
syms y mu0 G Na U(y) T0(y) eqn1 = diff(mu0*diff(U,y)) == G; eqn2 = diff(T0,y,2) + Na*mu0*(diff(U,y))^2 == 0; conds1 = [U(-1)=...

8 giorni fa | 0

Risposto
Using tabular data for Curve fitting of function z = f (x, y) with incomplete values of z. These blank z (i, j) automatically takes zero values and this is a problem
green = [5 5 5 5 5 4 4 4 4 1 1 1]; blue = [5 10 15 20 25 5 10 15 20 5 10 15]; yellow = [455 322 261 205 169 410 306 246 191 25...

10 giorni fa | 1

| accettato

Risposto
Numerical method of the "fimplicit" function
Since you can specify a mesh density in x- and y- direction, my guess is that the function is simply evaluated on X x Y. Sign ch...

10 giorni fa | 0

Risposto
My roots don't match example roots when solving routh criterion
syms K s p = s^3+9*s^2+12*s+15+3*K; solve(p,s,'MaxDegree',3) var2 = vpa(ans); var = subs(var2,K,-1)

11 giorni fa | 0

| accettato

Risposto
Interrupt a while loop with functions if it takes too long
Is there a way of timing the iteration during its execution and break it? No. You could go into the function and time certain o...

11 giorni fa | 1

| accettato

Risposto
How to solve the system of time dependent coupled PDE's?
ode23t seems to work for high Reynolds numbers. In case ode23t fails (e.g. for the low Reynolds number regime), I recommend the ...

13 giorni fa | 1

Risposto
Problem with my gamma_water values not giving me the correct pressure using fsolve
Look at the curves and see what's happening. Your first equation has two solutions while your second has none: DelH = -1* (-917...

14 giorni fa | 0

Risposto
An absolutely ascending sequence
x = 0:10; all(diff(x)>0)

14 giorni fa | 0

| accettato

Risposto
Find zero of simple monotonic function where the independent variable can only be integer
If you know a lower integer value xl and an upper integer value xu with y(xl)*y(xu) < 0, you could do a binary search starting f...

15 giorni fa | 0

Risposto
Model simulation Code for SEIR
seir_simulation() function seir_simulation() % Parameters beta = 0.3; % Effective contact rate without control sigma = 1/5; ...

15 giorni fa | 0

Risposto
using loops and arrays to solve for variables in equations
You mean this ? x=zeros(5,1); vis=zeros(5,1); %strain rate epsUse=1e-14; Puse=1e9; PARAMS.R=8.314; %ideal gas constant %d...

15 giorni fa | 0

| accettato

Risposto
How to use Matlab to find a pressure in a temperature and density spreadsheet using the nearest density value.
%Generate artificial data t = linspace(10,30, 25); p = linspace(1, 20, 20); [T,P] = ndgrid(t,p); d = exp(-((T-20).^2+(P-10)....

15 giorni fa | 0

Risposto
Kolmogorov-Smirnov (KS) Test
From the documentation: h = kstest(x,Name,Value) returns a test decision for the one-sample Kolmogorov-Smirnov test with additi...

15 giorni fa | 0

Risposto
Solving the hub location problem
You set % Renewal of population population = offspring; and offspring has only size 1x100 instead of 1x186. Thu...

16 giorni fa | 1

| accettato

Risposto
Why does the value of tolerance stop at n=2 (third value of the iteration) within the while loop?
Maybe you mean tol = 1e-7 instead of tol = exp(-7) ? However: It's correct that MATLAB quits the while-loop after three val...

17 giorni fa | 1

Risposto
Minimization linprog constraint no feasible solution
The last equality constraint says that you want 0*x1 + 0*x2 + 0*x3 + 0*x4 + 0*x5 + 0*x6 + 0*x7 + 0*x8 = 6.6, thus 0 = 6.6 ... ...

18 giorni fa | 0

| accettato

Carica altro