An Argument Problem
- To: mathgroup at smc.vnet.net
- Subject: [mg91722] An Argument Problem
- From: Mr Ajit Sen <senra99 at yahoo.co.uk>
- Date: Sat, 6 Sep 2008 02:09:07 -0400 (EDT)
- Reply-to: senra99 at yahoo.co.uk
Dear Mathgroup,
I am trying to numerically integrate a function of several variables w.r.t. its last variable. As NIntegrate won't work, I decided to use Simpson's 1/3 rule. Below is my attempt for a function of 2 variables (using Mathematica 6.0):
Simpson[F_, a_, b_, n_?EvenQ] := Module[{h, evens, odds},
h = (b - a)/n;
evens = Table[a + i h, {i, 2, n - 2, 2}];
odds = Table[a + i h, {i, 1, n - 1, 2}];
h/3 {F[x, a], F[x, b], 4 F[x, #] & /@ odds,
2 F[x, #] & /@ evens} // Flatten // Total] // Simplify // N
This works OK & returns a function of x. My query is how to make Simpson give a function of whatever the fist argument of F is. Thus, if F= F[r,t]=
,
Simpson would integrate w.r.t. t & give a function of r (without my having to change the x's into r's). Basically, I can't suss out how to pass the first argument of F inside the module.
Thanks for any help.
Regards.
Ajit