Mathematica 9 is now available
Student Support Forum
-----
Student Support Forum: 'DSolve Problem!!!!' topicStudent Support Forum > General > Archives > "DSolve Problem!!!!"

Next Comment >Help | Reply To Topic
Author Comment/Response
Gianni
05/29/98 5:08pm


I've tried to evaluate this command:
Dsolve[{la1'[t]==-K1 la2[t]-K3 la4[t],la2'[t]==2 w la4[t]-la1[t],la3'[t]==-K3 la
2[t]-K2 la4[t],la4'[t]==-2 w la2[t]-la3[t],x''[t]==la2[t]/2+K1 x[t],K3 y[t]+2 w
y'[t],y''[t]==la4[t]/2+K3 x[t]+K2 y[t]-2 w x'[t],x[0]==x0adim,x'[0]==vx0adim,y[0
]==y0adim,y'[0]==vy0adim,x[tf]==xtfadim,x'[tf]==vxtfadim,y[tf]==ytfadim,y'[tf]==
vytfadim},{la1[t],la2[t],la3[t],la4[t],x[t],y[t]},t]


whith:

tf=13.2479;
x0adim=2.601 10^-6;
vx0adim=0.00981;
y0adim=2.601 10^-6;
vy0adim=0.00981;
xtfadim=0;
vxtfadim=-0.03927;
ytfadim=0.062435;
vytfadim=0;
w=1.00612;
K1=0.759202;
K2=2.27761;
K3=1.2831;

DSolve work fine with mathematica 2.2.3 (10 second for evaluation) but with math
ematica 3.0 it try to evaluate for more then 10 hours without finish the work.
Why this is possible and what is the solution for this problem?
Thanks


URL: ,

Subject (listing for 'DSolve Problem!!!!')
Author Date Posted
DSolve Problem!!!! Gianni 05/29/98 5:08pm
Re: DSolve Problem!!!! Forum Modera... 05/29/98 5:16pm
Next Comment >Help | Reply To Topic