Some problems with DSolve and NDSolve
- To: mathgroup at smc.vnet.net
- Subject: [mg19745] Some problems with DSolve and NDSolve
- From: "Chee Lim Cheung" <cheelc at mbox2.singnet.com.sg>
- Date: Wed, 15 Sep 1999 03:53:01 -0400
- Sender: owner-wri-mathgroup at wolfram.com
Hi MathGroupers,
I was somewhat surprised that DSolve is unable to solve the following
relatively innocuous system of 1st-order ODEs:
DSolve[{2 i1[t] + 2 (i1'[t] - i2'[t]) == 80 t E^(-2t), 4 i2[t] + 2 (i2'[t]
- i1'[t]) == 0, i1[0] == 0, i2[0] == 0}, {i1[t],i2[t]}, t]
The normally reliable NDSolve also falls down on the following:
NDSolve[{2 i1[t] + 2(i1'[t] - i2'[t]) == 80 t E^(-2t), 4 i2[t] + 2(i2'[t] -
i1'[t]) == 0, i1[0] == 0, i2[0] == 0}, {i1[t], i2[t]}, {t, 0, 1}]
What is wrong?
Thanks
Chee