Integration Problems
- To: mathgroup at smc.vnet.net
- Subject: [mg13926] Integration Problems
- From: Georgios Kotsalis <kotsalis at mit.edu>
- Date: Mon, 7 Sep 1998 01:22:51 -0400
- Organization: Massachusetts Institute of Technology
- Sender: owner-wri-mathgroup at wolfram.com
Dear Sirs ,
while performing the following evaluation, i received an unexpected
result:
1.) W1[x_,t_]:=
q[2,1][t] (Sin[4.73 x] - Cos[4.73 x] + Exp[-4.73 x] + Exp[-4.73
(1-x)]);
2.) W2[x_,t_]:=Evaluate[(D[W1[x,t],{x,2} ])^2]
3.) Integrate[W2[x,t],{x,0,1}]
Answer:
(509.399 -2.922295 X 10^-5 I) q[2,1][t]^2
Could you please tell me, why does an imaginary part arise though the
function
that is being integrated is real ?
Thank you very much for your time.
Georgios