Re: More /.{I->-1} craziness
- To: mathgroup at smc.vnet.net
- Subject: [mg106191] Re: More /.{I->-1} craziness
- From: David Bailey <dave at removedbailey.co.uk>
- Date: Mon, 4 Jan 2010 06:01:43 -0500 (EST)
- References: <hhf5s3$h4o$1@smc.vnet.net> <200912310816.DAA24818@smc.vnet.net> <hhkj5p$534$1@smc.vnet.net> <201001021009.FAA07672@smc.vnet.net> <hhpl5k$9ng$1@smc.vnet.net>
Murray Eisenberg wrote: > David, > > Wow: you covered quite a bit that first day! > > Happy New Year, > Murray > > David Bailey wrote: >> ... when I gave introductory >> Mathematica courses, I covered the pitfalls of replacement rules on day one! > Well I like ReplaceAll to substitute variables in expressions, rather than starting with assignments like x=42 People invariably forget they have made top-level assigments to variables like that, and get into difficulties a few minutes later. Of course, that led into a discussion of what you could and couldn't do with ReplaceAll. If you start them with assignments, many students do everything with them! David Bailey http://www.dbaileyconsultancy.co.uk
- References:
- Re: More /.{I->-1} craziness
- From: David Bailey <dave@removedbailey.co.uk>
- Re: More /.{I->-1} craziness