NIntegrate with floating point limits
- To: mathgroup at smc.vnet.net
- Subject: [mg28864] NIntegrate with floating point limits
- From: "Fred Simons" <f.h.simons at tue.nl>
- Date: Wed, 16 May 2001 03:28:11 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
Dear mathgroup,
Can someone explain why the following integral can only be computed
numerically with exact limits and not with a floating point limit?
x = 1/4; NIntegrate[ CosIntegral[(x - u)/x + 1] - CosIntegral[1 - (x -
u)/x], {u, 0, x}]
returns 0.2362;
x = N[1/4]; NIntegrate[ CosIntegral[(x - u)/x + 1] - CosIntegral[1 - (x -
u)/x], {u, 0, x}]
returns some complaints and no result.
In all cases I met so far, floating points limits in numerical integration
caused no problems.
Many thanks in advance,
Fred Simons