More Integral Trouble
- To: mathgroup <mathgroup at yoda.physics.unc.edu>
- Subject: More Integral Trouble
- From: Roberto Sierra <73557.2101 at compuserve.com>
- Date: 19 Jul 93 22:06:16 EDT
I encountered another problematic integral the other day -- this one MMA could not evaluate (or reject) after crunching for a full 48 hours over the weekend and consuming 16MB of memory in the process. I'm using MMA 2.03 for the Mac. This type of equation comes about from electrostatic field theory. The variables sigma, x, y, z and r are considered constants within the integral. Shouldn't MMA give up much sooner?? Timing[Integrate[ (sigma Sqrt[r^4 Sin[theta]^2] (x - r Cos[phi] Sin[theta])) / ((z - r Cos[theta])^2 + (x - r Cos[phi] Sin[theta])^2 + (y - r Sin[phi] Sin[theta])^2)^(3/2), {phi,0,2Pi},{theta,-Pi,Pi} ]] -- Roberto Sierra Tempered MicroDesigns