Re: Wrong partial derivatives calculated
- To: mathgroup at smc.vnet.net
- Subject: [mg41146] Re: Wrong partial derivatives calculated
- From: "Brian Gladman" <fake at nowhere.org>
- Date: Tue, 6 May 2003 05:54:12 -0400 (EDT)
- References: <b9514r$r86$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
"David" <david at hushmail.com> wrote in message news:b9514r$r86$1 at smc.vnet.net... > When I calculate (D[x^2 + xy + y^2, x) mathematica gives me 2y and when I > calculate D[x^2 + xy + y^2, y) I get 2x. These are wrong answers -- have I > got the syntax right? I'm trying to find partial derivatives of x^2 + xy + > y^2 with respect to x and y. The right forms are: D[x^2 + x y + y^2, x] D[x^2 + x y + y^2, y] There must be a space between x and y in 'xy' since, without a space, the latter is a new symbol 'xy' and not x multiplied by y as you intend. Brian Gladman