RE: Difference /recurrence equations
- To: mathgroup at smc.vnet.net
- Subject: [mg35141] RE: [mg35127] Difference /recurrence equations
- From: "DrBob" <majort at cox-internet.com>
- Date: Tue, 25 Jun 2002 19:55:38 -0400 (EDT)
- Reply-to: <drbob at bigfoot.com>
- Sender: owner-wri-mathgroup at wolfram.com
The following line: y(t+2) - 2Y(t+1) + 3Y(1) = 4 should be: y[t+2] - 2y[t+1] + 3y[1] == 4 Parentheses are NOT used for function notation in Mathematica, and "=" causes its left operand to be Set. You also mixed small and capital Y in that line -- they're two different symbols. Bobby Treat -----Original Message----- From: Andrew Biggs [mailto:agbiggs at hotmail.com] To: mathgroup at smc.vnet.net Subject: [mg35141] [mg35127] Difference /recurrence equations I'm new to Mathematica and am having trouble with inputting the equations I'm looking to solve. I know the basic input of RSolve, but can't quite get it. Here's a sample problem, if anyone could show me how to input into RSolve I can probably run with the ball after that. y(t+2) - 2Y(t+1) + 3Y(1) = 4 With the part in brackets being a subscript denoting time. I know it sounds dumb, but I just don't know the input notatin well enough to get a problem typed in correctly, and the Mathematica book is a little overwhelming. Any help greatly appreciated! Andrew