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Re: differentiation operator

  • To: mathgroup at smc.vnet.net
  • Subject: [mg100662] Re: differentiation operator
  • From: dh <dh at metrohm.com>
  • Date: Wed, 10 Jun 2009 17:10:59 -0400 (EDT)
  • References: <h0nulh$be1$1@smc.vnet.net>


Hi Chee,

I did not thoroughly test it, but if you define:

$Pre = # /. Times[ d expr_  Power[dx, -1]] :> D[expr, x] &

the following examples work:

d/dx x^2 -> 2x

d/dx Sin[x] -> Cos[x]

d/dx (x-x^3) -> 1-3x^2

e.t.c

Daniel



Chee Lim Cheung wrote:

> Hi All

> 

> My students have asked me whether it is possible to define the operator

> df[x]/dx for differentiation rather than D[f[x],x]. The operator is

> available in a palette but it does not seem to do anything other than for

> display only.

> 

> Example: d/dx(x^2)=2x rather than D[x^2,x]=2x.

> 

> Am I missing something?

> 

> Thanks

> Mr. Chee

> 




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