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MathGroup Archive 2005

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Re: D[...] change in 5.1

  • To: mathgroup at smc.vnet.net
  • Subject: [mg58694] Re: D[...] change in 5.1
  • From: dh <dh at metrohm.ch>
  • Date: Fri, 15 Jul 2005 03:02:10 -0400 (EDT)
  • References: <db57qa$4ri$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi Alexei,

$Version
5.1 for Microsoft Windows (October 25, 2004)

Why do you need:  "NonConstants -> {n,r}", that does not make sense.
Without it it works.

sincerely, Daniel

Alexei Akolzin wrote:
> Hi, 
> 
> In previous version two lines below seemed to work as intended:
> 
> In: 
> n /: D[n[i_], x[j_], NonConstants -> {n,r}] := (1/r)( d[i,j] - n[i] n[j] );
> D[ 1 + n[k], x[l] ]
> 
> Out: (-n[k] n[l] + d[k,l]) \ r
> 
> But now in ver 5.1 I get something like:
> Out: D[n, x[l], NonConstants -> {J, r, n}] (1)
> 
> The funny part is that D[ n[k], x[l] ] is recognized and substituted by the
> expression associated with definition of n.
> 
> I wonder whether there is a possibility to get Mathematica 5.1 recognize
> n[k] as an indexed symbol n.
> 
> Thanks.
> Alexei Akolzin.
> 


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