# Torsten

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**Content Feed**

Problem solving simultaneous ODEs using 4th order Runge-Kutta method (Too many input arguments.)

I changed (1./(1+(1/B).*C22d)).*(-c1.*(K22.*vy)); to (1./(1+(1/B).*C22d)).*(-c1.*(K22d.*vy)); in the definition of fvy. And...

ongeveer 18 uur ago | 0

incorrect number or types of inputs or outputs for function 'int'

% Define the parameters of the signal A = 1; % Amplitude T_0 = 4*pi; % Period syms t % Generate the signal ...

1 dag ago | 0

| accepted

How to solve system of ODE's with Boundary Conditions using BVP4C? (I would be very helpful for you)

Your remaining task: A loop over the values of M. M = 1.0; bvpfcn = @(x,y)[y(2);y(3);-y(1)*y(3)+y(2)^2+M*y(2);2*y(3)+2*y(1)*y(...

1 dag ago | 0

How to solve a system of three coupled vectorized second order ODEs

System to solve for r1=(r1x,r1y,r1z) is: dr1x/dt = v1x dv1x/dt = K1*(m2*(r1x-r2x)/((r1x-r2x)^2+(r1y-r2y)^2+(r1z-r2z)^2)^1.5 + ...

1 dag ago | 0

how to combine matrices

I think you mean xp1 = rand(2,3); xp2 = rand(4,5); xp3 = rand(1,4); xp4 = rand(12,18); szx1 = max([size(xp1,1),size(xp2,1),...

2 dagen ago | 0

Why does it give me errors during numerical integration?

T0=1;Hrxn=1;CpSum=1;K0=1;E0=1;R=1;FA0=1;FB0=1;FC0=1;FD0=1;thetaB=1;thetaC=1;thetaD=1;FT=1; T = @(x) T0 + (-Hrxn)./(CpSum).*x; ...

2 dagen ago | 0

| accepted

Index exceeds the number of array elements. Index must not exceed 10000.

My guess is that "Ytrain" has less than "len" elements. To confirm this, add the lines disp(len) disp(size(Ytrain)) after th...

2 dagen ago | 0

| accepted

Estoy intentando acceder a los costos de las licencias para matlab

Contact Sales: https://de.mathworks.com/company/aboutus/contact_us/contact_sales.html

2 dagen ago | 0

REQUIRE CODE FOR PARAMETER IDENTIFIABILITY FOR ODE BASED MODEL HAVING KINETIC PARAMETERS.

Take a look at https://de.mathworks.com/matlabcentral/answers/1933060-find-kinetic-constants-from-differential-equations?s_tid=...

2 dagen ago | 0

Getting Error Codes, not exactly sure what they mean or how to fix them, please help

% Define circuit parameters Vin_rms = 120; % V Vout = 2.4; % V Iload = 25e-3; % A Vripple = 0.12; % V R2 = 1e3; % Ohm...

3 dagen ago | 0

I am trying to get the answer for the sum to infinity for a geometric series. My output should be 3/2 and a loop should be used. I've done that but it won't work. Please help

Sum2Infinity = 0.0; for i = 0:1:10000 Sum2Infinity = Sum2Infinity + FirstTerm * CommonRatio^i; end

3 dagen ago | 0

| accepted

I cant get the correct plotting

% Given p = 7500; % kg/m^3 Cd33 = 16*10^10; %N/m^2 vp= 4620; % Ns/m Ceb = 1.43E-9; % F phi = 2.62; % As/m % Piezoelectri...

3 dagen ago | 0

| accepted

Matrix size mismatch Matlab Function

S(j) is a single value (1x1). exp(-norm(r-mu(:,j))^2/(2*sigma^2)) is a vector (50x1). You try to save a vector in a scalar val...

3 dagen ago | 0

| accepted

Help with solving a system of coupled equations of motions in time domain?

How did you come up with the sdot vector for the equations so far ? If you use a mass matrix, you simply have to add the additi...

3 dagen ago | 1

Error using odearguments ; Error in ode15s (line 153); Error in anand_shrivastan (line 625) ;below is the code

Add dZdt = dZdt.'; as last line in function "SpeciesODE".

3 dagen ago | 0

| accepted

How to solve large system of nonlinear equations using fsolve?

n = 20; A = rand(n); B = @(X)X*A-X.*X; X0 = rand(1,n); X = fsolve(B,X0) % or n = 20; A = rand(n); B = @(X)quadratic(X,A)...

3 dagen ago | 0

| accepted

Cannot use solver function with poisscdf function

syms lambda n eqn = exp(-lambda)*symsum(lambda^n/factorial(n),n,0,35) == 0.95; solve(eqn,lambda)

4 dagen ago | 0

Very slow function, excessive overhead?

The inner while loop is not necessary: if flag(i,2)-flag(i-1,2) == 1, then of course flag(i,2)-flag(i-1,2) ~== -1. Thus the incr...

4 dagen ago | 0

Problem during the use of 'fzero'

I'm surprised the initial value x0 is part of your function definition. Are you sure this is correct ? %% Global variables decl...

4 dagen ago | 1

How to solve 2nd order BVP using Chebyshev Spectral Method?

alpha = 0.1; xmesh = linspace(0,1,50); solinit = bvpinit(xmesh, [0 0]); bvpfcn = @(x,y)[y(2);0.75/(1+6*alpha*y(2)^2)]; bcfcn...

4 dagen ago | 0

Magnetized Hybrid Nanofluid Flow , MATLAB Code has some problem. Please help to Rectify. Highly Appreciated

MHN function MHN % Initialization of paramters beta=1.5; lambda=1.5; wt=2.5; wb=1.5; ks1=0.5; ks2=0.1; a=0.5; epsilo...

4 dagen ago | 0

| accepted

optimization in smart energy management system.I have used MILP algorithm but i got infeasible solution no point satisfy the constraints.how could i sort out these issues.

I have used MILP algorithm but i got infeasible solution no point satisfy the constraints.how could i sort out these issues. It...

4 dagen ago | 0

how to supply a cost function gradient based on some of optimisation paramters

Would you please tell me if there is a way to supply a gradient based on some optimization parameters and use the finite differe...

4 dagen ago | 0

Nested Function is not working correctly with ode45

You can also get an analytical solution for v since your piecewise equation is easily integrated. EGA215_1234567_A1_Q2 functio...

5 dagen ago | 0

Constrained Optimization Problem With Obj Function Which Is Numerical Solution To A System Of ODE's

You never use the 53 solution variables of u and v in your code. And you solve the following ODEs for u and v du/dt = u, u(0)...

5 dagen ago | 0

Each element of INTCON must be an integer in the range [1 numVars], ([1 1]). What is the meaning??

f = c' * P_max + c0; % objective function is a scalar value. Thus intlinprog assumes you want to solve a problem with only one ...

5 dagen ago | 1

Error using symfun/subsref (line 203) Invalid argument at position 2.

N(i) = symfun(((1/(2*A))*(a(i)+b(i)*x+c(i)*y)),[x y]); instead of N = symfun(((1/(2*A))*(a(i)+b(i)*x+c(i)*y)),[x y]); And N...

5 dagen ago | 0

I have these 3 columns and I want to divide p/z and put the p/z values in a new columns

p=[2080,1885,1620,1205,888,645]; z=[0.759,0.767,0.787,0.828,0.866,0.900]; gp=[0,6.873,14.002,23.687,31.009,36.207]; new_row =...

6 dagen ago | 0

How to obtained matris vector solution using fminunc function?

You will have to use fminunc three times: c_1=[3;5;8]; c_2=[2;6;8]; x1_sol = zeros(size(c_1)); x2_sol = zeros(size(c_1)); f...

6 dagen ago | 0

| accepted

Applying updated initial conditions at every points of tspan and solve system of ODE using ode45

Then why do you solve for v1 if you want to prescribe it ? Simply set v1 = u0x + vp*p1 in your code and determine displacement...

7 dagen ago | 0