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Mass Matrix SWITCH Problem in Matlab
Now it gives me the error: Error using odearguments (line 92) @(T,Y)ROCKING_DGL(T,Y,TIME_R,DT,UG,VG,FSSFUN,SYS...
nästan 8 år ago | 0
Mass Matrix SWITCH Problem in Matlab
Is there another possibility to do this? Is it true that now it is substituting the variables in each step of the ODE15s solver?...
nästan 8 år ago | 0
Question
Preconditioner for non linear mass matrix
I have to solve an ODE system of the form: M(y,t)*dydt = F(y,t) The problem is, that it is very ill conditioned. I used...
nästan 8 år ago | 1 answer | 0
1
answerQuestion
Problems with Preconditioning for ODE Solver
I'm trying to solve a dynamic FEM Problem for a 3D cantilever beam with 2 Elements. I enterred the Input in mm, N etc. Now when ...
nästan 8 år ago | 0 answers | 0
0
answersQuestion
How to Compute MvPattern?
I'm trying to compute the MvPattern Sparsity Matrix S for the use in ODE15s solver because my Mass Matrix M(t,y) is strongly dep...
ungefär 8 år ago | 1 answer | 0
1
answerQuestion
Provide Jacobian Matrix for ODE15s solver
I'm using the ODE15s solver and want to ad the input for a jacobian matrix. The following file calculates the jacobi matrix J: ...
ungefär 8 år ago | 1 answer | 0
1
answerMass Matrix SWITCH Problem in Matlab
Thank you for your answer! 1)We would need to see how you initialized your flag variable to figure out why you are getting th...
ungefär 8 år ago | 0
Question
Mass Matrix SWITCH Problem in Matlab
I'm having a problem with my ODE in Matlab. The code to start the ODE solver is the following: refine = 4; options = ...
ungefär 8 år ago | 4 answers | 0
4
answersQuestion
Problem with Event Function
I created a function file which contains my ODE which has to be solved. In each step a value is calculated: i_up = 0 or 1. If it...
ungefär 8 år ago | 1 answer | 0
1
answerQuestion
Problems with strrep: y(1)0 instead of y(10)
I'm having a problem replacing some strings with strrep. I have to replace some strings y1,y2,y3,y4 etc with y(1),y(2),y(3),y...
ungefär 8 år ago | 3 answers | 0
3
answersQuestion
Convert symbolic system of differential Equations to numerical for ODE45
Hi all. I have to solve a FEM Problem. For this I created a function which computes the needed matrices and so the set of differ...
ungefär 8 år ago | 0 answers | 0
0
answersQuestion
How to change the ODE to be solved for different ranges in ODE45
Hi I have to solve a dynamics problem with MATLAB. I have two differential equations which are only valid for positive resp. ...
ungefär 8 år ago | 2 answers | 0
2
answersQuestion
Real time plot of vibration data
Hi everybody For a course at the university I need Matlab to compute a realtime plot of vibration data. Below you find the in...
nästan 9 år ago | 2 answers | 0