FindRoot and NIntegrate
- To: mathgroup at smc.vnet.net
- Subject: [mg81850] FindRoot and NIntegrate
- From: mfedert at gmail.com
- Date: Fri, 5 Oct 2007 04:44:01 -0400 (EDT)
Hi all,
I have what is probably a very simple problem. I want to find x which
solves an equation of the form
\integral f(x,y) dy = 0
I have tried something along the lines of
FindRoot[ NIntegrate[ f(x,y) , {y, -inf, inf} ], {x, x_0 } ]
but it doesn't work ---- my theory being that NIntegrate tries to go
ahead and do the numerical integration before it knows what x is equal
to... which blows up because the integrand is - as a function of x -
non-numerical... Is there a way around this? I'm sure there's some
trivial modification I can make to get things working again.
Thanks, in anticipation ---
MF