Strange error message from NIntegrate
- To: mathgroup at smc.vnet.net
- Subject: [mg28149] Strange error message from NIntegrate
- From: Henrik Holm <h.holm at spray.no>
- Date: Sun, 1 Apr 2001 00:08:08 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
I am trying to do the following numerical integration:
NIntegrate[x^{3/2}*Exp[-x]*BesselI[3/2,x/2], {x,0, Infinity}]
this results in the following error,
NIntegrate::"inum":
Integrand {0.141859424324175} is not numerical at {x} = {1.}.
I think this is very strange, after all, 0.1418... _is_ a
number. It might be noted that doing the integration
symbolically works nicely:
Integrate[x^{3/2}*Exp[-x]*BesselI[3/2,x/2], {x,0, Infinity}]
which gives the following result:
16/(9*Sqrt[pi])
I guess I am doing something wrong, but I cannot understand
what. Can anybody help me?
Regards,
Henrik Holm