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Re: Wrong partial derivatives calculated

  • To: mathgroup at smc.vnet.net
  • Subject: [mg41181] Re: Wrong partial derivatives calculated
  • From: "Bill Bertram" <wkb at ansto.gov.au>
  • Date: Tue, 6 May 2003 06:05:05 -0400 (EDT)
  • Organization: Australian Nuclear Science and Technology Organisation
  • 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.
>

David,

xy is not the same as  x*y !




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